Weigh Module Systems Handbook A15598500A (12/99).
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METTLER TOLEDO Publication Revision History An overview of this manual’s revision history is compiled below. Publication Name: METTLER TOLEDO Weigh Module Systems Handbook Publication Part Number: Part Number Date A15598500A 12/99 15598500A Publication Date: 3/99 Revisions Added Information about 0958 Flexmount HD and VLM2 Value Line weigh modules.
INTRODUCTION Information regarding METTLER TOLEDO Technical Training may be obtained by writing, calling, or faxing: METTLER TOLEDO 1900 Polaris Parkway Columbus, Ohio 43240 USA phone: (614) 438-4511 fax: (614) 438-4958 www.mt.com WARNING This publication is provided solely as a guide for individuals who have received technical training and are familiar with the technical manuals of the METTLER TOLEDO products. This guide is not meant to replace the technical manual for various products.
PRECAUTIONS WARNING READ this manual BEFORE operating or servicing this equipment. FOLLOW these instructions carefully. PERMIT ONLY QUALIFIED PERSONNEL TO SERVICE THIS EQUIPMENT. EXERCISE CARE WHEN MAKING CHECKS, TESTS, AND ADJUSTMENTS THAT MUST BE MADE WITH POWER ON. FAILING TO OBSERVE THESE PRECAUTIONS CAN RESULT IN BODILY HARM. CAUTION DO NOT PASS WELDING CURRENT THROUGH THE LOAD CELLS! WHEN WELDING ON A SCALE, ALWAYS GROUND THE WELDING DEVICE AS CLOSE TO THE WORK AS POSSIBLE.
Contents 1 Introduction ....................................................................................................... 1-1 Compression Weigh Modules .............................................................................................. 1-1 Tension Weigh Modules ...................................................................................................... 1-2 2 Weigh Module Applications.................................................................................
Structural Integrity ................................................................................................................ 5-4 Pressure Imbalances............................................................................................................ 5-4 Provisions for Test Weights ................................................................................................... 5-5 Structural Support Guidelines................................................................................
Sizing Weigh Modules ...................................................................................................... 11-2 Installation....................................................................................................................... 11-3 12 Calibration..................................................................................................... 12-1 Calibration with Test Weights............................................................................................
16 Index.............................................................................................................
Chapter 1: Introduction Compression Weigh Modules 1 Introduction This handbook is intended as a guide to selecting and applying METTLER TOLEDO weigh modules for process weighing applications. It provides the scientific data and accepted guidelines needed to help you design an accurate, reliable weighing system. A weigh module is a weighing device that consists of a load cell and the mounting hardware needed to attach the load cell to a tank, hopper, or other vessel.
METTLER TOLEDO Weigh Module Systems Handbook Tension Weigh Modules Tension weigh modules are used for tanks or hoppers that must be suspended from a building’s superstructure or upper floor. A typical tension weigh module is shown in Figure 1-2. It uses an S-shaped load cell that is threaded on both ends. Each threaded end of the load cell accepts a spherical rod-end bearing and clevis arrangement that connects to existing threaded vessel support rods.
Chapter 2: Weigh Module Applications Tanks, Hoppers, and Vessels 2 Weigh Module Applications Weigh modules can be used to convert nearly any structure into a scale. They can be part of a structure’s original design or can be added to an existing structure. This chapter describes the most common weigh module applications. Tanks, Hoppers, and Vessels Tanks, hoppers, and vessels are used for material handling in many industries.
METTLER TOLEDO Weigh Module Systems Handbook Figure 2-2: Hopper Supported by Tension Weigh Modules Conveyors To weigh objects that are transported on a conveyor system, mount a section of the conveyor on weigh modules (see Figure 2-3). Because the objects being weighed on a conveyor are usually in motion, these applications require a weigh module capable of withstanding high horizontal shear loads while still delivering repeatable weighments.
Chapter 2: Weigh Module Applications Mechanical Scale Conversions Mechanical Scale Conversions There are two ways to convert older mechanical lever scales (see Figure 2-4) for electronic weighing. The first method is a lever conversion. It involves adding an S-Cell tension weigh module, while retaining the levers and weighing platform from the existing mechanical scale. The second method is a lever replacement.
METTLER TOLEDO Weigh Module Systems Handbook How to determine the load cell size needed for a conversion: • Determine the initial pull force at the end of the transverse lever. • Determine the weight of the existing weighbridge platform (deadweight ). • Determine the capacity of the existing scale. • Determine the multiple of the lever system.
Chapter 3: General Considerations Compression versus Tension Load Cells 3 General Considerations Compression versus Tension Load Cells There are two basic types of load cells for use in weigh modules: Compression load cells are designed so that a tank or other structure can be mounted on top of the weigh module. The weight being measured compresses the load cell. Tension load cells are designed so that a tank or other structure can hang from the weigh module.
METTLER TOLEDO Weigh Module Systems Handbook Static versus Dynamic Loading METTLER TOLEDO offers five types of compression systems: Flexmount®, Flexmount HD™, Centerlign™, Ultramount™, and Value Line weigh modules. Which type should be used for an application depends on how the load will be applied. Flexmount, Flexmount HD, and Value Line weigh modules are designed primarily for static loading applications, where minimal lateral forces are present (see Chapters 6, 7, and 10).
Chapter 3: General Considerations Weighing System Performance Weighing System Performance Accuracy, resolution, and repeatability are basic concepts used to measure a weighing system’s performance. Accuracy is how close the reading on a scale’s indicator is to the actual weight placed on the scale. A scale’s accuracy is usually measured against a recognized standard, such as NIST Certified Test Weights. Resolution is the smallest weight change that a digital scale can detect.
METTLER TOLEDO Weigh Module Systems Handbook Determining System Accuracy and Repeatability Experience has shown that a tank scale fully supported by weigh modules on a firm foundation can be accurate to within 0.1% of the applied load (the weight placed on the scale). When this type of scale is calibrated correctly, it will give an accurate reading of the weight placed on it. Ideally, the percentage of total weight capacity should equal the percentage of total counts (increments).
Chapter 3: General Considerations Weighing System Performance Calibration Errors Some errors are caused because the weighing equipment is not calibrated correctly. When there is a calibration error (see Figure 3-2), the counts-to-load ratio is still a straight line, as it was in the ideal scale. But the line does not reach 100 percent of the counts at full load. The relationship between the weight and the counts is linear but not correct.
METTLER TOLEDO Weigh Module Systems Handbook Linearity Errors Linearity is a scale’s ability to maintain a consistent counts-to-load ratio (a straight line on the graph). When there is a linearity error, a scale reads correctly at zero and at full load capacity but incorrectly in between those two points (see Figure 3-3). The weight indication can either drift upward and read higher than the actual weight (as shown in the graph) or drift downward and read lower than the actual weight.
Chapter 3: General Considerations Weighing System Performance Hysteresis Errors Hysteresis is a scale's ability to repeat measurements as weights are added and removed. Figure 3-4 shows a typical hysteresis error. The scale is accurate at zero and at full load. When weight is gradually added to the scale, the curve drifts downward and the scale displays readings that are too low.
METTLER TOLEDO Weigh Module Systems Handbook What Kind of Accuracy Can You Expect in the Real World? A scale is only as accurate as its load cells. The best you can expect from a scale is that it will approach the performance rating of the load cells alone. Here are typical performance ratings for a quality load cell: • ± 0.01% R.C. non-linearity • ± 0.02% R.C. hysteresis • ± 0.03% R.C.
Chapter 3: General Considerations Weighing System Performance Rated Capacity Decreasing Load Hysteresis Combined Error Increasing Load OUTPUT Non-Linearity Ideal Linearity 0 0 Rated Capacity LOAD TYPICAL PERFORMANCE SPECIFICATIONS Individual Load Cell Load Cell System Accuracy Repeatability 0.01% RC* 0.03% FS** Combined Error (NonLinearity + Hysteresis) 0.03% RC* 0.
METTLER TOLEDO Weigh Module Systems Handbook Determining System Resolution The ability of a combination of load cells and indicator to give the desired system resolution or increment size can be determined by the following formula: Signal Strength = (Microvolts per Increment) Desired Increment Size × Load Cell Output (mV/V)* × Excitation Voltage** × 1,000 Individual Load Cell Capacity × Number of Load Cells *Most METTLER TOLEDO load cells have an output of 2 mV/V. **See Table 3-2 for excitation voltages.
Chapter 3: General Considerations Industry Standards Industry Standards There are several organizations that set standards for the scale industry and provide type evaluation to ensure the accuracy of scales. In the United States, type approval is given by the National Type Evaluation Program (NTEP), which is administered by the Office of Weights and Measures of the National Institute of Standards and Technology (NIST).
METTLER TOLEDO Weigh Module Systems Handbook +2.5 +2.0 +1.5 +1.0 Number of Divisions +0.5 0 500d 2000d 4000d 10,000d -0.5 -1.0 -1.5 -2.0 -2.5 Class III Figure 3-6: Handbook-44 Acceptance Tolerance Table The divisions on the vertical axis represent permissible error (the specified limits). The horizontal axis shows the number of divisions that corresponds to the actual weight on the scale.
Chapter 3: General Considerations Industry Standards The accuracy of a scale can also be described as a percentage of applied load accuracy. In Figure 3-7 the dashed line indicates a performance of 0.1% of applied load accuracy, compared with Handbook-44 Class III acceptance tolerances. A 0.1% (or ±0.05%) applied load accuracy roughly corresponds with the NIST Handbook 44 chart through 5,000 divisions. Notice, however, that the line indicating 0.
METTLER TOLEDO Weigh Module Systems Handbook International Standards Although NTEP certification is widely accepted in the United States, it is not a worldwide standard. When selling products outside of the United States, you should understand and follow the local standards. Some common standards include the Measurement Canada standard that is used in Canada and the Organisation Internationale de Métrologie Légale (OIML) standard adopted by the European Economic Community.
Chapter 3: General Considerations Industry Standards +2.5 +2.0 +1.5 +1.0 Number of Divisions +0.5 0 500d 2000d 4000d 10,000d -0.5 -1.0 -1.5 -2.0 Class III -2.5 Figure 3-8: OIML Acceptance Tolerance Table +2.5 +2.0 +1.5 +1.0 Number of Divisions +0.5 0 500d 2000d 4000d 10,000d -0.5 -1.0 -1.5 -2.0 -2.
METTLER TOLEDO Weigh Module Systems Handbook The biggest difference between NIST and OIML, besides the units used (English and S.I. respectively), is the creep rate specification. Creep is the change in a weight reading when a weight is left on a scale over a period of time. NIST specifications allow a creep rate of 0.5 division for test loads of 0 to 500 divisions, 1.0 division for test loads of 500 to 2,000 divisions, 1.5 divisions for test loads of 2,000 to 4,000 divisions, and 2.
Chapter 4: Environmental Considerations Wind Loading 4 Environmental Considerations Because environmental factors can affect the accuracy and safety of a weigh module system, they must be considered during the design stage. If a scale will be subject to wind, seismic, or shock loading, you might need to use larger capacity weigh modules or add restraint devices so that the structure remains stable under extreme conditions.
METTLER TOLEDO Weigh Module Systems Handbook When wind exerts a simple horizontal force on one side of a tank, it creates a suction force on the opposite side of the tank. These combined forces work to tip the tank in the direction the wind is blowing. There are also right angle suction forces pulling on each side of the tank, but they tend to cancel each other out.
Chapter 4: Environmental Considerations Wind Loading Example In the following example, we will calculate wind loading for a tank supported by four weigh modules and located on the coastline at Tampa, Florida. The wind force code used for this example is the Ohio Basic Building Code (BOCA). Always use the appropriate building code for your area to determine the equivalent wind force.
METTLER TOLEDO Weigh Module Systems Handbook 8’ c.g. FWF = 4,936 lb 20’ 30,000 lb gross 5,000 lb t are 4’ Figure 4-3: Wind Force Exerted on Sample Tank Scale By using statics (see Appendix 4), we can calculate the maximum downward force and maximum uplift force: • Maximum Shear Force: 4,936 pounds (equals wind force F ) • Maximum Downward Force: 16,138 pounds • Maximum Uplift Force: 7,388 pounds Compare these forces with the load ratings chart in Appendix 5.
Chapter 4: Environmental Considerations Seismic Loading Seismic Loading Seismic forces, movement caused by earthquakes and other shifts of the earth, are among the strongest external forces that can affect a tank scale. Figure 4-4 shows seismic potential for the United States, with seismic zone 0 being the least likely location for an earthquake and seismic zone 4 the most likely location for an earthquake. Seismic forces are analyzed in much the same way as wind forces.
METTLER TOLEDO Weigh Module Systems Handbook Zone 2A: 0.15 Zone 1: 0.10 I = Importance Factor Nonhazardous materials: 1.00 Hazardous materials: 1.25 to 1.50 C = Lateral Force Coefficient: 2.75 for most conditions CP = Lateral Force Coefficient (Tank as part of structure) Nonhazardous materials: 0.75 Hazardous materials: 1.25 Vessels on roof of building: 2.00 RW = Numerical Coefficient from Tables 23-O and 23-Q of UBC Bins & Hoppers: 4.00 Tanks: 3.
Chapter 4: Environmental Considerations Shock Loading Find your application in the table, based on tank location, tank contents, and seismic zone. Multiply the corresponding factor by the gross weight of the tank or vessel. The resulting value will equal the horizontal shear force (FEQ) applied at the tank’s center of gravity (see Figure 4-5).
METTLER TOLEDO Weigh Module Systems Handbook Equation for Lowered Weight: FMAX = W2 + W1 [1+ 1+ K (W1 + W2) V 2 GW1 2 ] Where: FMAX = Shock Force (pounds) W1 = Weight being Dropped or Lowered (pounds) W2 = Dead Weight of Platform (pounds) K = Spring Rate of Load Cells (pounds/inch), see Table 4-2 V = Velocity at which Object is Lowered (inches/second) G = Gravity (384 inches/second2) H = Height from which Object is Dropped (inches) Load Cell Capacity Spring Rate (K) 250 lb 17,857 500 lb 50,000
Chapter 4: Environmental Considerations Vibration • Add mass to the scale platform. • Use a shock-absorbing material such as (1) Fabreeka pads, (2) coil springs, (3) railroad ties, or (4) build a sandbox (foundry). (Fabreeka is a registered trademark of Fabreeka International, Inc.) Vibration If a scale vibrates constantly, it might not come to rest long enough to capture an accurate weight reading.
METTLER TOLEDO Weigh Module Systems Handbook NIST Handbook 44 legal-for-trade tolerances. The service/storage range is the temperature range in which the load cell will operate without physical damage.
Chapter 4: Environmental Considerations Lightning and Surge Protection • Protect cables by placing them in conduit or teflon wrap. • Locate tanks (and weigh modules) away from corrosive materials and chemicals. The combined effects of temperature, water, and air can corrode nearby weigh modules. If tanks are near corrosive substances, provide protective coatings and shieldings. Positive air flow in the area can also help prevent corrosion damage.
Chapter 5: General Installation Guidelines Applying Force to Load Cells 5 General Installation Guidelines Applying Force to Load Cells Load cells that use strain gauges are sensitive enough to detect very small changes in weight. The trick is to make sure that they react only to the weight you want to measure, not to other forces. To get accurate weight readings, you must carefully control how and where weight is applied to a load cell.
METTLER TOLEDO Weigh Module Systems Handbook Angular Loading Angular loading occurs when a force that is not perfectly vertical is applied to a load cell. This diagonal force can be defined as the sum of its vertical component and its horizontal component. In a well-designed weigh module application, the load cell will sense the weight (vertical force) but will not sense the side load (horizontal force).
Chapter 5: General Installation Guidelines Applying Force to Load Cells Eccentric Loading Eccentric loading occurs when a vertical force is applied to a load cell at a point other than its center line (see Figure 5-4). This problem can be caused by thermal expansion and contraction or by poorly designed mounting hardware. You can avoid eccentric loading problems by using a weigh module system that will compensate for expansion and contraction.
METTLER TOLEDO Weigh Module Systems Handbook Torsional Loading Torsional loading occurs when a side force twists a load cell (see Figure 5-6). It can be caused by structural deflection, system dynamics, thermal movement, or mounting hardware misalignment. Torsional loading will reduce a system’s accuracy and repeatability. To avoid this problem, always follow proper structural support and installation guidelines, and use weigh modules that compensate for tank movement.
Chapter 5: General Installation Guidelines Tank and Vessel Design air is vented, pressure will build up inside the tank. The increased pressure will produce a weighing error until a pressure balance can be restored. A similar condition occurs when a material is discharged rapidly from a tank, creating a partial vacuum inside the tank. To prevent pressure imbalances, make sure that the tank is adequately vented.
METTLER TOLEDO Weigh Module Systems Handbook Structural Support Guidelines The following guidelines provide information that can help you install a scale’s structural supports properly. Support Deflection Because load cells deflect only about 0.01 to 0.03 inch at rated capacity, they must be sensitive to very small movements. Even deflections in a tank scale’s structural support system can affect the weight indicated by the scale.
Chapter 5: General Installation Guidelines Structural Support Guidelines • Figure 5-8c: Support structure is out of level, applying side forces to the load cell. A tank scale’s support structure should deflect as little as possible, and any deflection should be uniform at all support points (see Figure 5-9). Excessive deflection can cause inlet and outlet piping to bind, creating linearity errors. When deflection is not uniform, it can cause repeatability errors and zero return errors due to creep.
METTLER TOLEDO Weigh Module Systems Handbook Weigh Module and Support Beam Alignment The center line of load application on a load cell should align with the center line of the weigh module’s support beam. Ideal installations for a compression weigh module and tension weigh module are shown in Figure 5-11a and Figure 5-11b.
Chapter 5: General Installation Guidelines Structural Support Guidelines Add web stiffeners or gussets if necessary to prevent the beam from twisting under load (see Figure 5-12). Web Stiffener or Gusset Figure 5-12: Reinforced Weigh Module Support Beam Stiffening Support Structures Metal support structures tend to bend or deflect as the amount of weight placed on them increases. Too much deflection can affect the accuracy of a tank scale.
METTLER TOLEDO Weigh Module Systems Handbook Structural Beam Support A better way to reduce deflection is to mount weigh modules near grounded vertical columns instead of at the center of horizontal support beams. Be sure to support all weigh modules with the same size structural beams to prevent differential deflection, which can cause nonrepeatability or zero-return problems.
Chapter 5: General Installation Guidelines Structural Support Guidelines Figures 5-15 and Figure 5-16 show details of methods used to mount weigh modules near grounded vertical beams.
METTLER TOLEDO Weigh Module Systems Handbook Tank Interaction When tank scales are located next to each other, the weight of one tank can affect the load sensed by the other tank’s weigh modules. There is a strong potential for this type of interaction when the tanks share a common foundation. The following figures show four tank scale installations, ranging from best (Figure 5-17a) to worst (Figure 5-17d).
Chapter 5: General Installation Guidelines Additional Vessel Restraint Methods Additional Vessel Restraint Methods Most METTLER TOLEDO compression weigh modules are designed to be selfchecking and provide adequate protection against tipping. But in applications with a potential for excessive wind or seismic load forces, additional restraint systems are often needed.
METTLER TOLEDO Weigh Module Systems Handbook Safety Rods Any tank that is suspended by tension weigh modules should have a secondary safety restraint system. Safety rods must be strong enough to support the filled tank in case the primary suspension system fails. For most applications, you would install one vertical safety rod next to each tension weigh module (see Figure 5-19). Fit each safety rod through an oversized hole in the bracket so that the rod does not influence the live weight readings.
Chapter 5: General Installation Guidelines Piping Design Piping Design Any time that piping is connected to a tank scale (a live-to-dead connection), there is a potential for mechanical binding. If piping is not installed properly, it can cause weighing errors by pushing or pulling on the tank. The best way to avoid those problems is to design piping so that it does not exert unwanted forces on a tank.
METTLER TOLEDO Weigh Module Systems Handbook Piping can have a significant effect on weighing accuracy, especially when many pipes are connected to a tank with a relatively low capacity. By designing the piping properly, you can reduce unwanted forces to a fraction of the tank’s live load. Then you can compensate for the remaining forces when you calibrate the scale. Since load cell simulators cannot simulate the forces produced by attached piping, calibration must be performed on the installed tank scale.
Chapter 5: General Installation Guidelines Piping Design Example Calculation Suppose a customer requires a tank scale with a system accuracy of 0.1% of the applied load. One pipe will be connected to the tank. To meet the system accuracy requirement, the vertical force exerted by the pipe (FP) must be equal to or less than 1% times the live load of the system. For this application, assume that the live (net) load equals 25,000 pounds.
METTLER TOLEDO Weigh Module Systems Handbook Piping Installation This section shows ways to install piping in order to avoid deflection problems. The greater the distance between the tank and the first pipe support, the more flexible the piping connection will be (see Figure 5-21a). Use a section of flexible hose so that the pipe does not exert unwanted forces when the tank deflects (Figure 5-21b).
Chapter 5: General Installation Guidelines Piping Design When a single discharge pipe is used by adjacent tanks (see Figure 5-23a), the weight of material being discharged from one tank can exert a downward force on the other tank. Instead, design the system so that the discharge piping from each tank is supported independently and does not interact with the other tank (see Figure 5-23b).
METTLER TOLEDO Weigh Module Systems Handbook When possible, avoid rigid connections between piping and tanks. Note the clearance between the tank and inlet/outlet piping in Figure 5-25. A flexible boot is used to seal each connection.
Chapter 5: General Installation Guidelines Electrical Wiring Electrical Wiring A weigh module system requires two types of electrical cables: • Load cell cables to connect each load cell to a junction box (cables are usually supplied with the load cells). • A home run cable to connect the junction box to an indicator.
METTLER TOLEDO Weigh Module Systems Handbook In harsh environments, load cell cables should be protected by running them through conduit. METTLER TOLEDO supplies a large analog junction box that is equipped with 1/2-inch conduit fittings (see Figure 5-27). The box is large enough so that excess cable can be coiled and stored inside the box.
Chapter 5: General Installation Guidelines Electrical Wiring IDNet Systems An IDNet junction box can output an IDNet data format that is compatible with METTLER TOLEDO ID1 and ID5 weight displays or with a Jaguar indicator. A sample layout for an IDNet system is shown in Figure 5-29. For IDNet junction box dimensions and wiring details, see Appendix 9. To Indicator Figure 5-29: IDNet Junction Box Layout Load Cell Cable Lengths Normally, each load cell is supplied with a standard length of cable.
METTLER TOLEDO Weigh Module Systems Handbook Home Run Cables A home run cable transmits the summed load cell signal from the junction box to the indicator. To provide accurate weight readings, a scale must be able to distinguish between electrical signals that differ by millionths of a volt. So small amounts of noise introduced through the cables can cause weighing errors.
Chapter 5: General Installation Guidelines Electrical Wiring Home Run Cable Lengths The maximum length of a home run cable varies with its conductor size (24 gauge, 20 gauge, or 16 gauge) and the type of indicator being used. You can increase the maximum length by using cables with larger conductors (Note: 16 gauge is larger than 24 gauge). If a cable exceeds the recommended length, it will cause a voltage drop that could affect weight readings.
Chapter 6: Flexmount Weigh Modules Sizing Weigh Modules 6 Flexmount Weigh Modules Flexmount weigh modules are designed for static loading applications such as tanks, hoppers, and vessels. Typically, the only force that needs to be considered is the weight of the tank and its contents (the vertical force pressing down on the top plate of the weigh module). Each weigh module has five basic components, which are shown in Figure 6-1.
METTLER TOLEDO Weigh Module Systems Handbook Top Plate: This plate is bolted or welded to a tank or other structure so that it receives the weight of the tank. Hold-Down/Jacking Bolt: This bolt connects the top plate to the base plate in order to check any uplift forces that might cause the tank scale to tip. Clearance must be maintained between the bolt and the top plate so that the bolt does not receive any of the weight that is being transferred to the load pin.
Chapter 6: Flexmount Weigh Modules Weigh Module Orientation Weigh Module Orientation In a typical tank scale application, three or four weigh modules would be used to support the tank. To provide accurate weighing, this system of weigh modules must allow for the thermal expansion and contraction of the tank. A Flexmount weigh module system does this by incorporating three different top plate designs: Fixed Pin: The opening in the underside of the top plate is sized to hold the load pin securely.
METTLER TOLEDO Weigh Module Systems Handbook Installation The actual installation procedure will depend on the specific requirements of an application. One of the first things to consider is the foundation on which the tank scale will be placed. This is usually a concrete floor or steel support structure. Whichever you are using, you will need to make sure that it is strong enough to remain rigid under the weight of the full tank scale.
Chapter 6: Flexmount Weigh Modules Installation Figure 6-3: Locating Bolt Holes in Support Steel 5. Raise the tank out of the way and drill the appropriate size anchoring holes in the support foundation. 6. Anchor the weigh module base plates to the foundation, using the instructions given below for the appropriate type of foundation. Level each base plate to within +1/16 inch. All base plates must be in the same level plane within +1/8 inch.
METTLER TOLEDO Weigh Module Systems Handbook Note: If you use J-bolt anchors, you will need to place them in the concrete accurately before attaching the weigh modules to the tank supports. Make sure that the tank support holes allow room for adjustment so that the modules can be aligned properly. For an Unlevel Concrete Floor Foundation: Install threaded epoxy inserts or J-bolts in the foundation to support the base plates. Place leveling nuts and washers beneath the base plates to adjust for level.
Chapter 6: Flexmount Weigh Modules Installation 8. After all the top plates are down and applying load to the load cells, make sure there is adequate clearance between the hold-down bolt and retaining hole. See the hold-down bolt assembly shown in Figure 6-7. A Hold-Down Bolt Assembly A Clearance Clearance Fixed-Pin Top Plate Top Plate Clearance Centering Washer & Nut Shown in the Weighing Position Base Plate SECTION A-A Figure 6-7: Flexmount Hold-Down Bolt Assembly 8.
Chapter 7: Flexmount HD Weigh Modules Sizing Weigh Modules 7 Flexmount HD Weigh Modules Flexmount HD weigh modules are heavy-capacity units designed for static loading applications such as tanks, hoppers, and vessels. Typically, the only force that needs to be considered is the weight of the tank and its contents (the vertical force pressing down on the top plate of the weigh module). Each weigh module has five basic components, which are shown in Figure 7-1.
METTLER TOLEDO Weigh Module Systems Handbook Load Pin: This pin fits into an opening in the underside of the top plate. It transfers weight from the top plate to a single point on the load cell. Top Plate: This plate is bolted or welded to a tank or other structure so that it receives the weight of the tank. Hold-Down/Jacking Bolts: These bolts connect the top plate to the base plate in order to check any uplift forces that might cause the tank scale to tip.
Chapter 7: Flexmount HD Weigh Modules Weigh Module Orientation Weigh Module Orientation In a typical tank scale application, three or four weigh modules would be used to support the tank. To provide accurate weighing, this system of weigh modules must allow for the thermal expansion and contraction of the tank. A Flexmount HD weigh module system does this by incorporating three different top plate designs: Fixed Pin: The opening in the underside of the top plate is sized to hold the load pin securely.
METTLER TOLEDO Weigh Module Systems Handbook Installation The actual installation procedure will depend on the specific requirements of an application. One of the first things to consider is the foundation on which the tank scale will be placed. This is usually a concrete floor or steel support structure. Whichever you are using, you will need to make sure that it is strong enough to remain rigid under the weight of the full tank scale.
Chapter 7: Flexmount HD Weigh Modules Installation Figure 7-3: Locating Bolt Holes in Support Steel 5. Raise the tank out of the way and drill the appropriate size anchoring holes in the support foundation. 6. Anchor the weigh module base plates to the foundation, using the instructions given below for the appropriate type of foundation. Level each base plate to within +1/16 inch. All base plates must be in the same level plane within +1/8 inch.
METTLER TOLEDO Weigh Module Systems Handbook Note: If you use J-bolt anchors, you will need to place them in the concrete accurately before attaching the weigh modules to the tank supports. Make sure that the tank support holes allow room for adjustment so that the modules can be aligned properly. For an Unlevel Concrete Floor Foundation: Install threaded epoxy inserts or J-bolts in the foundation to support the base plates. Place leveling nuts and washers beneath the base plates to adjust for level.
Chapter 7: Flexmount HD Weigh Modules Installation 7. After securing all the top plates and base plates, slowly back out the nut and centering washer on each hold-down bolt, carefully lowering the top plate and weigh structure onto the load cells. 8. After all the top plates are down and applying load to the load cells, make sure there is adequate clearance between the hold-down bolts and retaining holes. See the hold-down bolt assembly shown in Figure 7-7.
Chapter 8: Centerlign Weigh Modules Sizing Weigh Modules 8 Centerlign Weigh Modules Centerlign weigh modules are designed for dynamic loading applications such as conveyors, pipe racks, mixers, and blenders. In addition to the load being weighed (vertical force), these weigh modules can handle horizontal forces caused by the sideways movement of the structure that they support. Each weigh module has four basic components, which are shown in Figure 8-1.
METTLER TOLEDO Weigh Module Systems Handbook Top Plate: This plate is bolted or welded to a tank or other structure so that it receives the weight of the tank. Adjustable bumper bolts limit the movement of the top plate by bumping against the load cell. Sizing Weigh Modules To design a scale that will weigh material accurately, you must use weigh modules with the proper load cell capacity.
Chapter 8: Centerlign Weigh Modules Selecting Material Selecting Material Load cells and other weigh module components can be manufactured of carbon steel or stainless steel. Weigh modules that will be exposed to wet or corrosive environments are generally made of stainless steel. When selecting weigh modules, you will need to consider the environment in which they will be used and the materials that your facility will handle. Appendix 12 provides a chemical resistance chart to aid in selecting materials.
METTLER TOLEDO Weigh Module Systems Handbook End Bumper (Typical) Side Bumper (Typical) Figure 8-3: Plan View of Circular Mounting Arrangements Installation Centerlign weigh modules provide no protection against tipping. To prevent uplift forces from tipping the scale, you should install safety check rods. The actual installation procedure will depend on the specific requirements of an application. One of the first things to consider is the foundation on which the scale will be placed.
Chapter 8: Centerlign Weigh Modules Installation WARNING STRUCTURES SUCH AS TANKS AND CONVEYORS MUST BE PROPERLY DESIGNED TO MAINTAIN THE RELATIONSHIP OF THE LOAD SUPPORT POINTS THROUGH THE ENTIRE WEIGHING RANGE. 0958 Centerlign Weigh Module lb (kg) Base Plate Bearing psi (pascal) Top Plate Bolts (Metric) Base Plate Bolts (Metric) 250, 500, 1.25K, 2.5K & 5K (220, 550, 1100 & 2200) 159 (1,094,413) 3/8”-16 UNC (M10 x 1.5) 3/8”-16 UNC (M10 x 1.
METTLER TOLEDO Weigh Module Systems Handbook CAUTION DO NOT PASS WELDING CURRENT THROUGH THE LOAD CELLS! WHEN WELDING ON A SCALE, ALWAYS GROUND THE WELDING DEVICE AS CLOSE TO THE WORK AS POSSIBLE. NEVER WELD CLOSER THAN 4 FEET (1.2 METERS) TO ANY LOAD CELL WITHOUT REMOVING THE LOAD CELL. 5. Lower the weighbridge onto the support foundation (concrete slab or support beam). Mark the position of the base plate mounting holes on the foundation (see Figure 8-5).
Chapter 8: Centerlign Weigh Modules Installation For a Level Concrete Floor Foundation: Lower the weighbridge back onto the foundation so that the base plate mounting holes line up with the holes that were drilled in the concrete. Insert a wedge-design expansion anchor bolt into each base plate mounting hole (see Figure 8-6). Follow the anchor bolt manufacturer’s instructions regarding the size and depth of holes and recommended torque values.
METTLER TOLEDO Weigh Module Systems Handbook Flat Washer Hex Bolt Base Plate Lock Washer Flat Washer Hex Nut Web Stiffener Figure 8-8: Base Plate Bolted to Structural Beam 8. After securing all the top plates and base plates, slowly raise the weighbridge off the lower part of the weigh modules and replace each alignment tool with a rocker pin (see Figure 8-9). Place a rubber O-Ring on each end of each rocker pin.
Chapter 9: Ultramount Weigh Modules Sizing Weigh Modules 9 Ultramount Weigh Modules Ultramount weigh modules (5 to 100 kg) are designed for tanks, hoppers, and vessels with smaller capacities. Two options are available for transferring weight from the top plate to the load cell: a load pin for static loading applications such as tanks and a balland-cup assembly for dynamic loading applications such as conveyors. All Ultramount assemblies use stainless steel components and hardware.
METTLER TOLEDO Weigh Module Systems Handbook Top Plate: This plate is bolted or welded to a tank or other structure so that it receives the weight of the tank. Hold-Down Bolts: These bolts connect the top plate to the base plate in order to check any uplift forces that might cause the tank scale to tip. Clearance must be maintained between the bolt and the top plate so that the bolt does not receive any of the weight that is being transferred to the load pin or ball-and-cup assembly.
Chapter 9: Ultramount Weigh Modules Weigh Module Orientation Weigh Module Orientation In a typical tank scale application, three or four weigh modules would be used to support the tank. Ultramount weigh modules can be oriented for tangential or radial mounting as shown in Figure 9-2. Figure 9-2: Plan View of Mounting Arrangements Installation The actual installation procedure will depend on the specific requirements of an application.
METTLER TOLEDO Weigh Module Systems Handbook General Procedure 1. Position a weigh module under each of the weigh structure’s support points, and slowly lower the weigh structure onto the weigh modules. The jam nuts on the holddown bolts should be tightened until the top plate is tight against the heads of the bolts, so that no weight will be placed on the load cell when you lower the weigh structure. 2.
Chapter 9: Ultramount Weigh Modules Installation For a Level Concrete Floor Foundation: Lower the weigh structure back onto the foundation so that the base plate mounting holes line up with the holes that were drilled in the concrete. Insert a wedge-design expansion anchor bolt into each base plate mounting hole (see Figure 9-4). Follow the anchor bolt manufacturer’s instructions regarding the size and depth of holes and recommended torque values.
METTLER TOLEDO Weigh Module Systems Handbook For a Structural Beam Foundation: Use through bolts, washers, and nuts to anchor the base plate to the flange of the structural beam (see Figure 9-6). Install web stiffeners to prevent the beam from twisting. If shimming is required to level the base plates or to keep them in the same plane, add the shim beneath the entire base plate. For bolting the base plates, use four M10 or 3/8-16 UNC anchor bolts.
Chapter 9: Ultramount Weigh Modules Installation Clearance Clearance Clearance Top Plate Clearance Clearance Baseplate Figure 9-8: Hold-Down Bolt Assembly (Cross Section) 9. Mount the junction box in a location where the load cell cables can be properly terminated in the junction box. Do not mount the junction box on the scale. Note: Each load cell is supplied with a standard length of cable.
Chapter 10: Value Line Weigh Modules Sizing Weigh Modules 10 Value Line Weigh Modules Value Line weigh modules are designed for general purpose applications such as OEM machinery, conveyors, and tanks and hoppers with very flexible inlets/outlets. Typically, the only force that needs to be considered is the weight of the tank and its contents (the vertical force pressing down on the top plate of the weigh module). Each weigh module has three basic components, which are shown in Figure 10-1.
METTLER TOLEDO Weigh Module Systems Handbook Mounting Pad: This pad is bolted to a tank or other structure so that it receives the weight of the tank. Sizing Weigh Modules To design a tank scale that will weigh its contents accurately, you must use weigh modules with the proper load cell capacity. There are three main factors in sizing weigh modules for a tank scale: (1) the weight of the empty tank, (2) the weight of the tank’s contents when full, and (3) the number of weigh modules.
Chapter 10: Value Line Weigh Modules Weigh Module Orientation Weigh Module Orientation In a typical tank scale application, three or four weigh modules would be used to support the tank. Space the weigh modules evenly, so that each one supports approximately the same amount of weight. Recommended mounting arrangements are shown in Figure 10-2.
METTLER TOLEDO Weigh Module Systems Handbook Installation The actual installation procedure will depend on the specific requirements of an application. One of the first things to consider is the foundation on which the tank scale will be placed. This is usually a concrete floor or steel support structure. Whichever you are using, you will need to make sure that it is strong enough to remain rigid under the weight of the full tank scale.
Chapter 10: Value Line Weigh Modules Installation Figure 10-3: Locating Bolt Holes in Support Steel 5. Raise the tank out of the way and drill the appropriate size anchoring holes in the support foundation. 6. Anchor the weigh module base plates to the foundation, using the instructions given below for the appropriate type of foundation. Level each base plate to within +1/16 inch. All base plates must be in the same level plane within +1/8 inch.
METTLER TOLEDO Weigh Module Systems Handbook Note: If you use J-bolt anchors, you will need to place them in the concrete accurately before attaching the weigh modules to the tank supports. Make sure that the tank support holes allow room for adjustment so that the modules can be aligned properly. For an Unlevel Concrete Floor Foundation: Install threaded epoxy inserts or J-bolts in the foundation to support the base plates. Place leveling nuts and washers beneath the base plates to adjust for level.
Chapter 10: Value Line Weigh Modules Installation Flat Washer Hex Bolt Base Plate Lock Washer Flat Washer Hex Nut Web Stiffener Figure 10-6: Base Plate Bolted to Structural Beam 7. Mount the junction box in a location where the load cell cables can be properly terminated in the junction box. Do not mount the junction box on the scale. Note: Each load cell is supplied with a standard length of cable.
Chapter 11: Tension Weigh Modules Sizing Weigh Modules 11 Tension Weigh Modules Tension weigh modules are designed for applications that require a tank, hopper, or other structure to be suspended. They are installed as part of the suspension system, so that the full weight of the hopper and its contents hangs from the weigh modules. Tension weigh modules can also be used to convert mechanical level scales for electronic weighing. Each weigh module has the basic components shown in Figure 11-1.
METTLER TOLEDO Weigh Module Systems Handbook on an indicator. Both the top and bottom of the load cell have an opening designed to accept a threaded rod. Spherical Rod End Bearing: For tank or hopper scale applications, a threaded rod end bearing is screwed into the opening on each end of the load cell. These two bearings are positioned so that one is turned at 90 degrees from the other. Clevis/Pin Assembly: A U-shaped clevis is connected to each rod end bearing with a clevis pin.
Chapter 11: Tension Weigh Modules Installation Installation To maintain the system’s weighing accuracy, make sure that the support steel will not deflect more than 1/16 inch under full working load. General Procedure 1. Position the tension weigh modules around the tank so that each will support an equal portion of the tank’s weight (see Figure 11-2). Make sure that the upper and lower support brackets line up with these positions.
METTLER TOLEDO Weigh Module Systems Handbook 3. Place the threaded rod through a hole in the upper support bracket. Fit a backing plate and washer over the end of the threaded rod. Then double-nut the threaded rod against the backing plate. Attach the other end of the weigh module assembly in the same way (see Figure 11-3). Upper Support Bracket Safety Rod Note: Make sure that the upper and lower clevis brackets are turned at 90 degrees to each other. This will reduce swaying.
Chapter 11: Tension Weigh Modules Installation To Load Cell Safety Rod 1/8” Backing Plate Backing Plate Double Nuts Washer Figure 11-4: Weigh Module Assembly Attached to Lower Support Bracket 5. Once all weigh modules have been installed, make sure that each is hanging vertically (plumb). 6. Tack weld the backing plates into position. Pin or stake the nuts at both ends of the threaded rods to prevent them from turning. 7.
METTLER TOLEDO Weigh Module Systems Handbook 1/16” Gap 1/16” Gap Typical Figure 11-5: Plan View of Check Rods for Systems with Three and Four Weigh Modules 11-6 (12/99)
Chapter 11: Tension Weigh Modules Installation Figure 11-6: Plan View of Alternative Check Rod System Safety Wire Rope Figure 11-7: Sample Tension Weigh Module Installation (12/99) 11-7
METTLER TOLEDO Weigh Module Systems Handbook Safety Chain Figure 11-8: Sample Tension Weigh Module Installation Safety Rod Figure 11-9: Sample Tension Weigh Module Installation 11-8 (12/99)
Chapter 12: Calibration Calibration with Test Weights 12 Calibration When a weigh module system is installed, it must be calibrated so that the readings on the indicator accurately reflect the amount of weight placed on the scale. METTLER TOLEDO recommends calibrating a scale using test weights equal to the scale’s full capacity. Specific instructions for calibration can be found in the technical manual for the digital indicator that will be used with the weigh modules.
METTLER TOLEDO Weigh Module Systems Handbook Calibration with Test Weights and Material Substitution For large tank scales, it is often physically impossible to hang test weights equal to the tank’s full capacity. In those cases, you can use a combination of test weights and a material (such as water) to calibrate the scale. 1. For example, after taking a zero reading you might hang 500 lb of test weights and take a reading. 2.
Chapter 13: Indicators and Applications Indicators 13 Indicators and Applications Indicators The basic job of a scale indicator is to receive the signal transmitted by the load cells and display it as a weight reading. For process weighing applications, indicators must provide fast, repeatable weight readings that remain stable at relatively high resolutions.
METTLER TOLEDO Weigh Module Systems Handbook than discrete outputs but have a slower update rate. Long cabling distances are possible, but connection with a PLC requires additional hardware/software. These outputs can communicate in demand, continuous, or host mode. Demand mode sends weight data to a printer or other device only when requested. Continuous mode transmits weight data repeatedly to a remote display or other device. Host mode allows two-way communication between the scale and a host computer.
Chapter 13: Indicators and Applications Jaguar Indicator Jaguar Indicator The Jaguar indicator is designed for use with complex automated processing systems. It offers the greatest range of options for interacting with process equipment. • Direct PLC Interface for Allen-Bradley RIO, Profibus-DP, or Modbus Plus. Up to four Jaguar indicators can share one PCB. Block transfer of floating point and shared data. Indicator can display messages from PLC.
METTLER TOLEDO Weigh Module Systems Handbook Panther Indicator The Panther indicator is a reliable scale terminal with basic capabilities for interacting with processing equipment. • Direct PLC Interface for Allen-Bradley RIO, Profibus-DP, or Modbus Plus. Each Panther indicator needs its own PCB. • Discrete I/O: One inputs and three outputs. Two one-speed setpoints. • BCD Output: Optional 9323 BCD module. • Analog Output: Optional analog kit. • Serial I/O: One bidirectional serial port (RS-232).
Chapter 13: Indicators and Applications Applications Applications Figure 13-1 shows a typical weigh module system with the indicator connected to a customer’s PLC. METTLER TOLEDO Ultramount Set Typical Customer Connection Customer's Programmable Logic Controller Processor PC Card I/0 I/0 I/0 I/0 Ultramount Weigh Modules Field Bus PANTHER METTLER TOLEDO 1 565.
METTLER TOLEDO Weigh Module Systems Handbook Figure 13-2 shows a weigh module system for a hazardous environment. The weigh module system is located within a hazardous area barrier and connected to an indicator and PLC in a safe area.
Chapter 13: Indicators and Applications Applications Figure 13-3 shows an overview of sample weigh module systems. Ethernet Level Plant-Wide Information System H Processor PC Card I/0 I/0 I/0 I/0 PLC Plant Network Field Bus PANTHER METTLER TOLEDO 1 565.4 0 G NET PT T 2 PANTHER METTLER TOLEDO 1 > = < 565.4 0 lb kg G NET PT T 2 > = < lb kg Mettler Tol edo 240.
Chapter 14: Appendices Appendix 1: Certificates of Conformance 14 Appendices Appendix 1: Certificates of Conformance Tables 14-1, 14-2, and 14-3 list certificate of conformance numbers for load cells used in METTLER TOLEDO weigh modules.
METTLER TOLEDO Weigh Module Systems Handbook Appendix 2: Design Qualification Form METTLER TOLEDO WEIGH MODULE DESIGN QUALIFICATION FORM 1. Type: Tank ____________ Hopper ____________ Vessel ____________ Other ____________ 2. Dimensions: Length ____________ Width (dia.) ____________ Height ____________ 3. Number of supports (Legs / Lugs / Suspension Rods): 4. Distance between supports: 5. Dimension of Legs / Rods: Length ____________ Width (dia.) ____________ Height _____________ 6. Gross capacity: 7.
Chapter 14: Appendices Appendix 3: Weigh Module Dimensions Appendix 3: Weigh Module Dimensions (4) E DIA. HOLES D (4) E SEMI-FLOATING FIXED FULL FLOATING BOTTOM VIEW OF TOP PLATE DIA. C HOLES LOAD PIN HOLD DOWN DUST SEAL BOLT ASSEMBLY B LOAD CELL G F A TOP PLATE 1/4-18 NPT MALE THREAD F G H F BASE PLATE SPACER PLATE Cell Capacity A B C D E Diameter F G H 250 - 5K lb 4.12 in. 4.50 in. 4.50 in. 7.00 in. 0.44 in. 0.50 in. 3.50 in. 6.00 in. 10K lb 5.38 in. 6.
METTLER TOLEDO Weigh Module Systems Handbook B G E G A D FIXED SEMI-FLOATING FULL FLOATING BOTTOM VIEW OF TOP PLATE 8X F H Load Cell C K J B/2 A/2 Load Pin Load Pin Cell Capacity A B C* D E F Diameter 50K, 75K, 100K lb 9 inches 229 mm 15 inches 381 mm 9 inches 229 mm 6 inches 152 mm 12 inches 305 mm 1.25 inches 31.8 mm 150K, 200K lb 12 inches 305 mm 18 inches 457 mm 10 inches 254 mm 8 inches 203 mm 14 inches 356 mm 1.625 inches 41.
Chapter 14: Appendices Appendix 3: Weigh Module Dimensions (3) BUMPER BOLT POSITIONS (4) E DIA. HOLES D (4) E DIA. HOLES BOTTOM VIEW OF TOP PLATE C LOAD PIN B TOP PLATE G F LOAD CELL G F A 1/4-18 NPT MALE THREAD G F H F BASE PLATE SPACER PLATE Cell Capacity A B C D E Dia. F G H 250 - 5K lb 4.12 in. 4.50 in. 4.50 in. 7.00 in. 0.44 in. 0.50 in. 3.50 in. 6.00 in. 10K lb 5.38 in. 6.00 in. 6.00 in. 9.25 in. 0.69 in. 1.00 in. 4.00 in. 7.25 in. 20K - 30K lb 7.50 in.
METTLER TOLEDO Weigh Module Systems Handbook G A B H F D E N D B O J A H L K C M A B C D E* F Thread G 2.76 inches 0.62 inch 4.00 inches 0.50 inch 3.15 inches -- 2.19 inches 70 mm 16 mm 102 mm 13 mm 80 mm M12 x 1.75 56 mm H J K L M N O Dia. 1.65 inches 0.71 inch 5.19 inches 2.99 inches 1.94 inches 1.64 inches 0.41 inch 42 mm 18 mm 132 mm 76 mm 49 mm 42 mm 10 mm *Dimension shown is in weighing configuration. Shipping height is 3.
Chapter 14: Appendices Appendix 3: Weigh Module Dimensions E D L 2X N H C Overload Gap 0.015 inch F 4X M P G K A J B Cell Capacity A B C D E F G 250 lb 6.00 inches (152.4 mm) 4.00 inches (101.6 mm) 3.12 inches (79.2 mm) 3.88 inches (98.6 mm) 2.38 inches (60.5 mm) 0.93 inch (23.6 mm) 0.50 inch (12.7 mm) 500 lb 6.00 inches (152.4 mm) 4.00 inches (101.6 mm) 3.88 inches (98.6 mm) 5.50 inches (139.7 mm) 3.38 inches (85.9 mm) 0.93 inch (23.6 mm) 0.50 inch (12.7 mm) 1,000 lb 6.
METTLER TOLEDO Weigh Module Systems Handbook D A (Nominal) Load Cell B C Cell Capacity A B C D 50 - 300 lb 7 5/8 inches 2 inches 1 3/8 inches 3/8-16 UNC 500 - 3,000 lb 10 9/16 inches 2 1/4 inches 1 7/8 inches 3/4-10 UNC 5,000 lb 12 5/8 inches 2 3/4 inches 2 3/4 inches 1-8 UNC 10,000 lb 12 5/8 inches 3 inches 2 3/4 inches 1-8 UNC 25 - 100 kg 180 mm 50.8 mm 32 mm M8 x 1.25 200 - 1,000 kg 250 mm 57.2 mm 49 mm M12 x 1.75 2,000 kg 450 mm 69.
Chapter 14: Appendices Appendix 4: Calculating Reaction Forces Appendix 4: Calculating Reaction Forces The effect of wind or seismic events on a tank is defined in terms of reaction forces (downward, upward, and shear). For the sample application used in this appendix, we will assume that the total horizontal shear equals the equivalent force applied at the tank’s center of gravity (c.g.). This total shear force will be distributed evenly among the weigh module supports.
METTLER TOLEDO Weigh Module Systems Handbook Circular Tank with Four Weigh Modules The following sample shows how statics is used to calculate reaction forces for an outdoor installation of a circular tank with four weigh modules. F Note: F is a horizontal force applied at the tank’s center of gravity. It is usually denoted FW for wind force and FEQ or V for seismic force. d c.g.
Chapter 14: Appendices Appendix 4: Calculating Reaction Forces Full Tank, Solve for RG ΣFY = 0 2R1 + 2R2 = WG assuming equal load distribution R1 = R2 = RG RG = WG 4 Empty Tank, Solve for RT ΣFY = 0 2R1 + 2R2 = WT assuming equal load distribution R1 = R2 = RT RT = WT 4 Download Force on a Full Tank FD = R1 + RG FD = WG F [ hL + 0.5 hT ] + 1.
METTLER TOLEDO Weigh Module Systems Handbook Appendix 5: Load Ratings per Weigh Module Flexmount and Flexmount HD Weigh Module Capacity Carbon Steel Modules Stainless Steel Modules 250 to 5K1 10K1 20K and 30K2 45K2 50K, 75K, and 100K2 150K and 200K2 250 to 5K1 10K1 20K and 30K2 45K2 Allowable Side Shear 1.7K 4.7K 100% 100% 100% 100% 1K 1.3K 100% 100% Allowable End Shear 12.4K 30.3K 100% 100% 100% 100% 7.2K 12.2K 100% 100% Allowable Uplift 6.7K 13.
Chapter 14: Appendices Appendix 6: Flexmount Top Plate Travel Appendix 6: Flexmount Top Plate Travel Flexmount weigh modules are designed to allow for the thermal expansion and contraction of the tank or other structure that is mounted on top of them. Table 14-5 lists the maximum distances that full-floating top plates can travel in any direction. These distances also apply to how far semi-floating top plates can travel in one direction only.
METTLER TOLEDO Weigh Module Systems Handbook Appendix 7: Load Cell Deflection Flexmount/Centerlign Flexmount/Centerlign Ultramount Tension Mount Tension Mount Load Cell Capacity (lb) Deflection at Rated Capacity (inches) Load Cell Capacity (kg) Deflection at Rated Capacity (mm) Load Cell Capacity (kg) Deflection at Rated Capacity (mm) Load Cell Capacity (lb) Deflection at Rated Capacity (inches) Load Cell Capacity (kg) Deflection at Rated Capacity (mm) 250 0.010 220 0.254 5 <0.4 50 0.
Chapter 14: Appendices Appendix 8: Bolt Thread Dimensions Appendix 8: Bolt Thread Dimensions The following tables list National Pipe Taper (NPT) dimensions and straight thread dimensions for hex head bolts. NPT Dimensions 1° 47' A B Effective Thread NPT Size Threads Per Inch A (inches) B (inches) 1/16 27 0.312 0.261 1/8 27 0.405 0.264 1/4 18 0.540 0.402 3/8 18 0.675 0.408 1/2 14 0.840 0.534 3/4 14 1.050 0.546 1 11 1/2 1.315 0.683 1 1/4 11 1/2 1.660 0.
METTLER TOLEDO Weigh Module Systems Handbook Straight Thread Dimensions H Nominal Diameter W Straight Thread Dimensions (US) Threads per Inch Nominal Thread Size Coarse (UNC) Fine (UNF) 6 32 8 Straight Thread Dimensions (Metric) Nominal Diameter W (inches) H (inches) Nominal Thread Size* Thread Pitch (mm) Nominal Diameter W (mm) H (mm) 40 0.1380 - - M3 0.5 3 5.5 2.125 32 36 0.1640 - - M4 0.7 4 7.0 2.925 10 24 32 0.1900 - - M5 0.8 5 8.0 3.650 12 24 28 0.
Chapter 14: Appendices Appendix 9: Junction Box Dimensions and Wiring Diagrams Appendix 9: Junction Box Dimensions and Wiring Diagrams This appendix provides dimension drawings and wiring diagrams for analog, DigiTOL, and IDNet junction boxes. Analog Junction Boxes Note: Dimensions are shown in inches.
METTLER TOLEDO Weigh Module Systems Handbook Note: Do not cut load cell cables. Cutting a cable will eliminate its shield wire and affect performance. Note: Turn all pots fully clockwise before calibrating the scale.
Chapter 14: Appendices Appendix 9: Junction Box Dimensions and Wiring Diagrams DigiTOL Junction Boxes Note: Dimensions are shown in inches. Figure 14-11: DigiTOL Junction Box Dimensions WARNING DO NOT USE THE DigiTOL JUNCTION BOX IN LOCATIONS CLASSIFIED AS HAZARDOUS BY THE NATIONAL ELECTRICAL CODE (NEC) ARTICLE 500. To Indicator Note: Do not cut load cell cables. Cutting a cable will eliminate its shield wire and affect performance.
METTLER TOLEDO Weigh Module Systems Handbook Load Cell Wiring Function Color for Model 743 (45K only) Color for Model 777 (5-100 kg) Color for Model 713 Color for All Other Load Cells +Excitation White Blue Red Green +Sense -- Green* -- -- +Signal Green White Green White Shield Yellow Yellow Yellow Yellow -Signal Black Red White Red -Sense -- Gray* -- -- -Excitation Blue Black Black Black * For Model 777 load cells, connect the +Sense wire to the +Excitation terminal
Chapter 14: Appendices Appendix 9: Junction Box Dimensions and Wiring Diagrams IDNet Junction Boxes Note: Dimensions are shown in inches. Figure 14-13: IDNet Junction Box Dimensions WARNING DO NOT USE THE IDNet JUNCTION BOX IN LOCATIONS CLASSIFIED AS HAZARDOUS BY THE NATIONAL ELECTRICAL CODE (NEC) ARTICLE 500. Note: Do not cut load cell cables. Cutting a cable will eliminate its shield wire and affect performance.
METTLER TOLEDO Weigh Module Systems Handbook Load Cell Wiring Function Color for Model 743 (45K only) Color for Model 777 (5-100 kg) Color for Model 713 Color for All Other Load Cells +Excitation White Blue Red Green +Sense -- Green* -- -- +Signal Green White Green White Shield Yellow Yellow Yellow Yellow -Signal Black Red White Red -Sense -- Gray* -- -- -Excitation Blue Black Black Black * For Model 777 load cells, connect the +Sense wire to the +Excitation terminal
Chapter 14: Appendices Appendix 10: NEMA/IP Enclosure Types Appendix 10: NEMA/IP Enclosure Types The National Electrical Manufacturers Association (NEMA) provides descriptions, classifications, and test criteria relating to enclosures for electrical equipment. Tables 14-14, 14-15, and 14-16 compare the specific applications of enclosures for indoor and outdoor nonhazardous locations and indoor hazardous locations.
METTLER TOLEDO Weigh Module Systems Handbook Provides a Degree of Protection Against Atmospheres Typically Containing:* Type 7 and 8 Enclosures** C D E F Type 10 Class A Acetylene I X Hydrogen, manufactured gas I Diethyl ether, ethylene, cyclopropane I Gasoline, hexane, butane, naphtha, propane, acetone, toluene, isoprene I Metal dust II Carbon black, coal dust, coke dust II Flour, starch, grain dust II X Fibers, flyings*** III X Methane with or without coal dust B Type 9 Enclo
Chapter 14: Appendices Appendix 10: NEMA/IP Enclosure Types Tables 14-17 and 14-18 describe the features each enclosure is expected to have and the tests applied to each. NEMA Type Description Requirements/Design Tests 1 Indoor use primarily to provide a degree of protection against limited amounts of falling dirt. Rod Entry, Rust Resistance 2 Indoor use primarily to provide a degree of protection against limited amounts of falling water and dirt.
METTLER TOLEDO Weigh Module Systems Handbook NEMA Type Description Requirements/Design Tests* 7 Indoor use in locations classified as Class I, Groups A, B, C, and D, as defined in the National Electrical Code. ANSI/UL 698, ANSI/UL 877, ANSI/UL 886, ANSI/UL 894 8 Indoor or outdoor use in locations classified as Class I, Groups A, B, C, and D, as defined in the National Electrical Code.
Chapter 14: Appendices Appendix 10: NEMA/IP Enclosure Types Table 14-20 provides a brief description of the IP Code elements. Full details are specified in the clauses listed in the last column.
METTLER TOLEDO Weigh Module Systems Handbook Appendix 11: Engineering Specifications This appendix contains engineering specifications for Model 0958 Flexmount weigh modules, Model 0958 Flexmount HD weigh Modules, Model 0958 Centerlign weigh modules, Model 0972 Ultramount weigh modules, Model VLM2 Value Line weigh modules, and Model 0978 Tension weigh modules.
Chapter 14: Appendices Appendix 11: Engineering Specifications 2.6 2.7 2.8 2.9 to be out of a vertical position. Load cells which allow movement of the load point on the load cell are not acceptable. The load introduction mechanism between the top plate and the load cell shall be a pin design constructed of hardened 17-4ph stainless steel. The load pin shall have an O-ring seal at one end to prevent dirt and other foreign material from entering the load cell bearing surface.
METTLER TOLEDO Weigh Module Systems Handbook 5.4 5.5 5.6 14-30 (12/99) 5.3.8 Excitation Voltage: ____________ 5.3.9 Insulation Resistance: ____________ 5.3.10 Maximum Loads Safe Overload: 150% of R.C. Ultimate Overload: 300% of R.C. Safe Side Load: 100% of R.C. 5.3.11 Gauge Cavity & Wiring Seal Type: ____________ (potted or hermetic) seal Each load cell shall have an integral conduit fitting on the cable entrance into the load cell for enhanced moisture protection.
Chapter 14: Appendices Appendix 11: Engineering Specifications NIST System Specifications Qty.
METTLER TOLEDO Weigh Module Systems Handbook NIST Load Cell Specifications Rated Capacity of Load Cell (lb) 250*, 500, 1,250, 2,500, 5,000, 10,000 20,000, 30,000 45,000 Rated Output 2.0 ± 0.002 mV/V 2.0 ± 0.005 mV/V 2.0 ± 0.005 mV/V Zero Balance ± 0.02 mV/V ± 1.5% of R.C. ± 1.5% of R.C. Combined Error Due to Non-Linearity and Hysteresis 0.03% of R.C. 0.02% of R.C. 0.02% of R.C. Non-Repeatability 0.01% of R.C. 0.01% of R.C. 0.01% of R.C.
Chapter 14: Appendices Appendix 11: Engineering Specifications OIML System Specifications Qty.* Load Cell Capacity (kg) System Capacity (kg) Cable Length (m) Conduit Fitting (H)ermetic Cell (P)otted Cell 3 220 660 4.57 1/4-18 NPT H 4 220 880 4.57 1/4-18 NPT H 3 550 1,650 4.57 1/4-18 NPT H 4 550 2,200 4.57 1/4-18 NPT H 3 1,100 3,300 4.57 1/4-18 NPT H 4 1,100 4,400 4.57 1/4-18 NPT H 3 2,200 6,600 4.57 1/4-18 NPT H 4 2,200 8,800 4.
METTLER TOLEDO Weigh Module Systems Handbook OIML Load Cell Specifications Rated Capacity of Load Cell (kg) 220, 550, 1,100, 2,200, 4,400 9,072, 13,608 20,412 Rated Output 1.94 ± 0.002 mV/V 2.0 ± 0.005 mV/V 2.0 ± 0.005 mV/V Zero Balance (% of rated output) 1.0 1.0 1.0 Combined Error Due to Non-Linearity and Hysteresis 0.017% of R.C. 0.02% of R.C. 0.02% of R.C. Non-Repeatability 0.01% of R.C. 0.01% of R.C. 0.01% of R.C.
Chapter 14: Appendices Appendix 11: Engineering Specifications Flexmount HD Weigh Modules The portions of this specification that have been left blank ( __________ ) should be filled with information about the specific application. Information for the blanks in Section 1.1 can be found in Table 14-25. Information for the blanks in Sections 4.2.1 to 4.2.9 can be found in Table 14-26. 1 General Provisions 1.
METTLER TOLEDO Weigh Module Systems Handbook 2.10 14-36 (12/99) Module assembly shall withstand force equal to 100% of the rated capacity in any horizontal or vertical plane without mechanical failure. 3 Material and Finish Specification 3.1 Load cells shall be made of E4340 alloy tool steel and load pins shall be made of hardened 17-4ph stainless steel. 3.2 Top and bottom mounting plates shall be abrasive blasted to 1.5 to 2.5 mils profile per SSPC-SP10 (Near White Blast). 3.
Chapter 14: Appendices Appendix 11: Engineering Specifications 5 Junction Box Specifications 5.1 Junction box enclosure shall be constructed of type 304 stainless steel and shall be designed to NEMA 4X/IP65 standards. 5.2 The junction box enclosure shall have washdown duty connectors, one for each load cell cable, and one additional connector for the instrument cable. Multiple cables using single box connectors are not acceptable. 5.
METTLER TOLEDO Weigh Module Systems Handbook NIST System Specifications Qty.
Chapter 14: Appendices Appendix 11: Engineering Specifications Centerlign Weigh Modules The portions of this specification that have been left blank ( __________ ) should be filled with information about the specific application. Information for the blanks in Sections 1.1 and 5.3.11 can be found in Table 14-27 (Table 14-29 for OIML applications). Information for the blanks in Sections 5.3.1 to 5.3.9 can be found in Table 14-28 (Table 14-30 for OIML applications).
METTLER TOLEDO Weigh Module Systems Handbook 4.2 14-40 (12/99) Top and bottom mounting plates shall be made of type 304 stainless steel and have an electro-polished finish. 5 Load Cell Specifications 5.1 All load cells shall meet or exceed the National Institute of Standards and Technology (NIST) Handbook 44 for Class III weighing devices and shall be certified by the National Type Evaluation Program (NTEP) for 3,000 division Class III accuracy. 5.2 OIML load cells can be offered as an option. 5.
Chapter 14: Appendices Appendix 11: Engineering Specifications 6.5 have a single terminal connection. Doubling up or ganging of wires to one terminal is not acceptable. The summing printed circuit board shall have potentiometers, one per load cell for the electrical trimming/balancing of the load cell signals during calibration. 7 Warranty 7.
METTLER TOLEDO Weigh Module Systems Handbook NIST Load Cell Specifications Rated Capacity of Load Cell (lb) 250*, 500, 1,250, 2,500, 5,000, 10,000 20,000, 30,000 45,000 Rated Output 2.0 ± 0.002 mV/V 2.0 ± 0.005 mV/V 2.0 ± 0.005 mV/V Zero Balance ± 0.02 mV/V ± 1.5% of R.C. ± 1.5% of R.C. Combined Error Due to NonLinearity and Hysteresis 0.03% of R.C. 0.02% of R.C. 0.02% of R.C. Non-Repeatability 0.01% of R.C. 0.01% of R.C. 0.01% of R.C.
Chapter 14: Appendices Appendix 11: Engineering Specifications OIML Load Cell Specifications Rated Capacity of Load Cell (kg) 220, 550, 1,100, 2,200, 4,400 9,072, 13,608 20,412 Rated Output 1.94 ± 0.002 mV/V 2.0 ± 0.005 mV/V 2.0 ± 0.005 mV/V Zero Balance (% of rated output) 1.0 1.0 1.0 Combined Error Due to Non-Linearity and Hysteresis 0.017% of R.C. 0.02% of R.C. 0.02% of R.C. Non-Repeatability 0.01% of R.C. 0.01% of R.C. 0.01% of R.C.
METTLER TOLEDO Weigh Module Systems Handbook Ultramount Weigh Modules Static Load Pin Suspension The portions of this specification that have been left blank ( __________ ) should be filled with information about the specific application. Information for the blanks in Section 1.1 can be found in Table 14-31. Information for the blanks in Sections 4.3.1 to 4.3.9 can be found in Table 14-32. 14-44 (12/99) 1 General Provisions 1.
Chapter 14: Appendices Appendix 11: Engineering Specifications 4 Load Cell Specifications 4.1 All load cells shall meet or exceed the National Institute of Standards and Technology (NIST) Handbook 44 for Class III weighing devices and shall be certified by the National Type Evaluation Program (NTEP) for 5,000 division Class III accuracy. 4.2 All load cells shall be certified to meet or exceed Organisation de Metrologie Legale (OIML) C3 R60 3,000 division accuracy requirements. 4.
METTLER TOLEDO Weigh Module Systems Handbook 5.5 The summing printed circuit board shall have potentiometers, one per load cell for the electrical trimming/balancing of the load cell signals during calibration. 6 Warranty 6.1 The product shall be free from defects in workmanship and materials for a period of 1 year from date of original installation, or 18 months from the date of shipment to the original buyer, whichever occurs first.
Chapter 14: Appendices Appendix 11: Engineering Specifications Load Cell Specifications Rated Capacity of Load Cell (kg) 5*, 10, 20, 50, 100 Rated Output 2.0 mV/V +1.0% or -0.1% (for 5 kg) 2.0 mV/V ±0.05% (for 10-100 kg) Zero Balance ± 0.02 mV/V Combined Error Due to Non-Linearity and Hysteresis 0.02% of R.C. Non-Repeatability 0.01% of R.C. Temperature Compensation -10° to +40° C +14° to +104° F Terminal Resistance Input: 350Ω to 480Ω Signal: 356Ω ±0.
METTLER TOLEDO Weigh Module Systems Handbook Ultramount Weigh Modules Dynamic Ball-and-Cup Suspension The portions of this specification that have been left blank ( __________ ) should be filled with information about the specific application. Information for the blanks in Section 1.1 can be found in Table 14-33. Information for the blanks in Sections 4.3.1 to 4.3.9 can be found in Table 14-34. 14-48 (12/99) 1 General Provisions 1.
Chapter 14: Appendices Appendix 11: Engineering Specifications 4 Load Cell Specifications 4.1 All load cells shall meet or exceed the National Institute of Standards and Technology (NIST) Handbook 44 for Class III weighing devices and shall be certified by the National Type Evaluation Program (NTEP) for 5,000 division Class III accuracy. 4.2 All load cells shall be certified to meet or exceed Organisation de Metrologie Legale (OIML) C3 R60 3,000 division accuracy requirements. 4.
METTLER TOLEDO Weigh Module Systems Handbook 5.5 The summing printed circuit board shall have potentiometers, one per load cell for the electrical trimming/balancing of the load cell signals during calibration. 6 Warranty 6.1 The product shall be free from defects in workmanship and materials for a period of 1 year from date of original installation, or 18 months from the date of shipment to the original buyer, whichever occurs first.
Chapter 14: Appendices Appendix 11: Engineering Specifications Load Cell Specifications Rated Capacity of Load Cell (kg) 5*, 10, 20, 50, 100 Rated Output 2.0 mV/V +1.0% or -0.1% (for 5 kg) 2.0 mV/V ±0.05% (for 10-100 kg) Zero Balance ± 0.02 mV/V Combined Error Due to Non-Linearity and Hysteresis 0.02% of R.C. Non-Repeatability 0.01% of R.C. Temperature Compensation -10° to +40° C +14° to +104° F Terminal Resistance Input: 350Ω to 480Ω Signal: 356Ω ±0.
METTLER TOLEDO Weigh Module Systems Handbook Value Line Weigh Modules The portions of this specification that have been left blank ( __________ ) should be filled with information about the specific application. Information for the blanks in Section 1.1 can be found in Table 14-35. Information for the blanks in Sections 4.2.1 to 4.2.9 can be found in Table 14-36. 14-52 (12/99) 1 General Provisions 1.
Chapter 14: Appendices Appendix 11: Engineering Specifications 4.4 4.5 4.6 Each load cell shall have an integral conduit fitting on the cable entrance into the load cell for enhanced moisture protection. Each load cell shall have a data plate affixed to the load cell which clearly shows: 4.5.1 Manufacturer 4.5.2 Capacity 4.5.3 Part Number 4.5.4 Serial Number 4.5.5 Class Number 4.5.6 NTEP Certificate of Conformance Number 4.5.7 Maximum Divisions (Nmax) 4.5.
METTLER TOLEDO Weigh Module Systems Handbook NIST System Specifications Qty.
Chapter 14: Appendices Appendix 11: Engineering Specifications NIST Load Cell Specifications Rated Capacity of Load Cell (lb) 250*, 500, 1,000, 2,000, 2,500 Rated Output 3.0 ± 0.010 mV/V Zero Balance ± 2% of R.C. Combined Error Due to Non-Linearity and Hysteresis 0.03% of R.C. Non-Repeatability 0.01% of R.C.
METTLER TOLEDO Weigh Module Systems Handbook Tension Weigh Modules The portions of this specification that have been left blank ( __________ ) should be filled with information about the specific application. Information for the blanks in Section 1.1 can be found in Table 14-37 for capacities in pounds (Table 14-38 for capacities in kilograms). Information for the blanks in Sections 4.3.1 to 4.3.9 can be found in Table 14-39. 14-56 (12/99) 1 General Provisions 1.
Chapter 14: Appendices Appendix 11: Engineering Specifications 4.4 4.5 4.6 Ultimate Overload: 300% of R.C. Safe Side Load: 100% of R.C. Load cells shall be constructed of 17-4ph stainless steel and shall have an environmentally protected gauge cavity. Each load cell shall have a sealed cable fitting on the cable entrance into the load cell for enhanced moisture protection. Each load cell shall have a data plate affixed to the load cell which clearly shows: 4.6.1 Manufacturer 4.6.2 Capacity 4.6.
METTLER TOLEDO Weigh Module Systems Handbook NIST System Specifications Qty.
Chapter 14: Appendices Appendix 11: Engineering Specifications OIML System Specifications Qty.* Load Cell Capacity (kg) System Capacity (kg) Cable Length (m) Load Cell Material 1 25 25 7.62 17-4 ph Stainless Steel 3 25 75 7.62 17-4 ph Stainless Steel 4 25 100 7.62 17-4 ph Stainless Steel 1 50 50 7.62 17-4 ph Stainless Steel 3 50 150 7.62 17-4 ph Stainless Steel 4 50 200 7.62 17-4 ph Stainless Steel 1 100 100 7.62 17-4 ph Stainless Steel 3 100 300 7.
METTLER TOLEDO Weigh Module Systems Handbook Load Cell Specifications Rated Capacity of Load Cell 50, 100, 200, 300, 500, 1,000, 2,000, 3,000, 5,000, 10,000 (lb) 25, 75, 100, 200, 500, 1,000, 2,000, 5,000 (kg) Rated Output 2.0 ± 0.2 mV/V 2.0 ± 0.2 mV/V Zero Balance ± 1.0% of R.C. ± 1.0% of R.C. Combined Error Due to NonLinearity and Hysteresis 0.03% of R.C. 0.03% of R.C. Non-Repeatability 0.01% of R.C. 0.01% of R.C.
Chapter 14: Appendices Appendix 12: Chemical Resistance Chart Appendix 12: Chemical Resistance Chart The following chemical resistance chart is provided as a guide to help select materials for weigh module system components and hardware. The information is reprinted courtesy of Little Giant Pump Company. These recommendations are based on information from material suppliers and careful examination of available published information and are believed to be accurate.
METTLER TOLEDO Weigh Module Systems Handbook Hexyl - A A - A A A A C - A - - - - A A A - Isobutyl - A A - B A A A C - A - - - - A A A B - A - A A - A C B A A A A Isopropyl - A A - B A A A C C A - - - - A A A - Methyl6 - A A A B A A A C A A - B - A A C A D B A - A A A C B - A A A A Octyl - A A - A A A A C - A - Propyl - A A - A A A A - - - - A A A - - A B A - A A A A - - A - A A - A A D B A A A - A - A A - A C C B A A A - - - A A - A B - B A C A - A - A A - A A B A A A A Aluminu
Chapter 14: Appendices Appendix 12: Chemical Resistance Chart Barium Sulfide B A A - D B - C - C C - A A A A A A - B A - A A - A A C A A A A Beer2 A A A - A A A A B D D A A - A A B D B B D - A A - A D C A A A A Beet Sugar Liquids A A A - A - Benzaldehyde3 A A A - B A A A - B A C D D A D A C D D D A A A - D D B D A D A Benzene2 B A A A B A B B A B C B D C A D A A D D D A A A A A D - D D D A Benzoic Acid2 B A A A B A A B - D - A A B A A B D - B D - A B - A D - D D D A - A B A - Benzol - A A - B
METTLER TOLEDO Weigh Module Systems Handbook Chlorox (Bleach) - A A - C - A A - D C - A B A A D D B - D C A A - A C - B B D A Chocolate Syrup - A A - A - - - - D - - - - - A A A - - A - - A - A A - A - D A Chromic Acid (5%) - A A B C A A D D D - Chromic Acid (10%) - B - - - A A - D - - A A - A A - D - - A - - A - A D - D - - C Chromic Acid (30%) - B - - - A A - D - - B A - A D - D - - A - - A - A D - D - - D Chromic Acid (50%) C B B - C A A D D D - C B B A D D D C C B B D A
Chapter 14: Appendices Appendix 12: Chemical Resistance Chart Formaldehyde (40%) - Formaldehyde A A A - A A B A B D A - A B A D A A - B A A A A - D C B D B C A Formic Acid6 C A B B D C A C C D D A D B A A D D - B A A A A B B D C D A C B Freon 111 A - A - B - - B - C B - B D A D A A D C - A A A A B C D D D D A Freon 12 (Wet)2 - - D - B - - B - - - Freon 22 - - A - B - - B - - - - D D - B A A - - - A A A A D D D A A A A Freon 113 - - A - B - - B - - - - C D - - - A A A A C A D
METTLER TOLEDO Weigh Module Systems Handbook Ink A A A - C - Iodine - D D D D A B D - D - - D B A A C D D D D - D A - A B - D B D A Iodine (In Alcohol) - - D - A C - D - Iodoform B C A - A - - C - C B - - - A - Isotane2 - - - - - - - - D A - Isopropyl Acetate - - B - C - - - - - Isopropyl Ether2 A - A - A - - A - Jet Fuel (JP#, JP4, JP5) A A A - A - Kerosene2 A A A A A A A A A A B A A D A D A A B D D A A A A A A D D A D A Ketones A A A - B A A A - A A D D D A D B A - D
Chapter 14: Appendices Appendix 12: Chemical Resistance Chart Methyl Methacrylate - Methylamine A - A - A - - - - - - - - - - - A - - - - - A A - D D - D D D A - D - B B - - - - - - - - - B D - - - - - A A - Methylene Chloride A A A - A A A A C - B D D - A D A D - D D - A A - D D - D D D A Milk A A A A A - - C C D D - A - - A A A B B A - A A A A A B A A A A Molasses A A A A A - - A B A A - A - - B A A - B A - A A A A A - A - - A Mustard A A A A B - - B - C B - A
METTLER TOLEDO Weigh Module Systems Handbook Tanning - A A - Turbine - A A - A - Oleic Acid - - - - - - - - A - A - - - - A - - - - A A - A A - D - - A - - - - - A - C - - - - A A - A A - D - D A - A B A A B B - B B C C C - A C A C B A B D C - A A - D B D D D D A Oleum (25%) - Oleum B - A - B - - - - - Oxalic Acid (Cold) C A B A C C B B C D D - A B A C C D - A A - A A - A B C B A C A Paraffin A A A A A - Pentane A C C - A - B A - B B - Perchloroethylene2 B A A -
Chapter 14: Appendices Appendix 12: Chemical Resistance Chart Gold Plating Cyanide 150°F - - A - - A A C - - - - D - A A - A - - A - - B - A A - A - - D Neutral 75°F - - C - - A A - - - - - A - A A - A - - A - - A - A A - A - - A Acid 75°F - - C - - A A - - - - - A - A A - A - - A - - A - A A - A - - A Indium Sulfamate Plating R.T.
METTLER TOLEDO Weigh Module Systems Handbook Rust Inhibitors - A - A - - - A - A - - Salad Dressing - A - A B - - B - D - - A - Sea Water A A C A C A - C - Shellac (Bleached) A A - A A - - A B B A - - - A - A A - - A - - A - - A - - - - A Shellac (Orange) A A - A A - - A C C A - - - A - A A - - A - - A - - A - - - - A Silicone - B - A B - - A - - - - - - - A A A - - A - A A - A A B A A A A Silver Bromide - C C B D - - - - - - - - A C - - Silver Nitrate
Chapter 14: Appendices Appendix 12: Chemical Resistance Chart Stoddard Solvent A A A A A A A A A B B A A D A D A A B D D A A A - A B D D D D A Styrene A A A - A - - A - - - A A A - Sugar (Liquids) A A A A A - A A - B B - - A - - - A A A A B - A - A A A A A - B - A A Sulfate Liquors - C C - B - A C - - - Sulfur Chloride - D D D D - - - D - - - - A A - B D D D D D A - - - - C D - - - A C A A D A - A D - A C - A D - D D D C Sulfur Dioxide2 - A A C A A B B - Sulfur Dioxide (Dry)
Chapter 13: Glossary 15 Glossary Accuracy — A scale’s ability to provide a weight reading equal to the actual weight placed on the scale. A scale’s accuracy is usually measured against a recognized standard, such as NIST Certified Test Weights. Calibration — The process of equating the graduations on a scale to the actual weight values that they represent.
METTLER TOLEDO Weigh Module Systems Handbook Live Load — The downward force exerted by an object or material being weighed on a scale. Live-to-Dead Connection — A mechanical connection between a scale and an object that you do not want to weigh. A common example is piping connected to a tank scale. If the connection is not flexible enough to allow the scale to move freely, the piping can push or pull on the scale and produce inaccurate weight readings.
Chapter 13: Glossary requirements of NIST Handbook 44, NTEP issues a Certificate of Conformance for that model of scale. Ultimate Overload — The weight at which a load cell will structurally fail (typically 300% of rated capacity). Weigh Module — A device that can be attached to a tank or other structure to convert the structure into a scale. Weigh modules are attached to a structure so that they support its full weight.
Chapter 16: Index 16 Index A Acceptance Tolerance, 3-11, 3-12, 3-13, 3-14, 3-15 Accuracy, 3-3, 3-4, 3-8, 3-12, 3-14, 4-9, 5-6, 5-9, 5-15, 5-16, 5-17 B I Indicators, 3-10, 5-21, 5-24, 13-1, 13-2, 13-3, 13-4 J Junction Boxes, 5-21, 5-22, 5-23, 6-7, 7-7, 8-8, 9-7, 107, 11-5 Bolt Thread Dimensions, 14-15, 14-16 C Cables, 5-21, 5-22, 5-23, 5-24, 5-25, 6-7, 7-7, 8-8, 9-7, 10-7, 11-5, 14-17, 14-18, 14-19, 14-20, 14-21, 14-22 Calibration, 3-2, 3-3, 5-5, 5-15, 5-16, 5-17, 12-1, 12-2 Calibration Errors, 3-4,
METTLER TOLEDO Weigh Module Systems Handbook Shock Loading, 4-1, 4-7, 4-8 Side Loading, 3-2, 5-2, 5-3, 14-12 Sizing Weigh Modules, 6-2, 7-2, 8-2, 9-2, 10-2, 11-2 Specifications, 14-28 Static Loading, 3-2, 5-3, 6-1, 7-1, 9-1 Statics, 4-2, 4-4, 4-7, 14-9, 14-10 Structural Support, 5-4, 5-6, 5-7, 5-8, 5-9, 5-10, 5-11, 512, 5-15, 5-19 Surge Protection, 4-11 T Temperature, 3-3, 3-12, 4-9, 4-10 Tension, 1-1, 1-2, 2-1, 2-2, 2-3, 3-1, 3-2, 5-8, 11-1 Test Weights, 5-5, 12-1 Top Plate Travel, 14-13 16-2 (12/99) U
METTLER TOLEDO Publication Suggestion Report If you have suggestions concerning this publication, please complete this form and fax it to (614) 841-7295 Publication Name: METTLER TOLEDO Weigh Module Systems Handbook Publication Part Number: A15598500A PROBLEM(S) TYPE: DESCRIBE PROBLEM(S): Technical Accuracy Text Completeness Procedure/step Example Explanation What information is missing? Publication Date: 12/99 INTERNAL USE ONLY Illustration Illustration Definition Guideline
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