USER'S GUIDE Vaisala HUMICAP® Moisture and Temperature Transmitter Series for Oil MMT310 M210474EN-C
PUBLISHED BY Vaisala Oyj Street address: Mailing address: Phone: Fax: Vanha Nurmijärventie 21, FI-01670 Vantaa, Finland P.O. Box 26, FI-00421 Helsinki, Finland +358 9 8949 1 +358 9 8949 2227 Visit our Internet pages at www.vaisala.com.
_________________________________________________________________________________ Table of Contents CHAPTER 1 GENERAL INFORMATION ............................................................................ 7 About This Manual ................................................................... 7 Contents of This Manual ....................................................... 7 Version Information ............................................................... 8 Related Manuals .............................
User's Guide _______________________________________________________________________ CHAPTER 4 OPERATION ................................................................................................. 31 Power Supply .......................................................................... 31 Transmitter Start-Up ............................................................... 31 Serial Line and Analog Communication Options ................ 32 RS-232 Serial Port Connection ...............................
_________________________________________________________________________________ Product Returns ..................................................................... 53 CHAPTER 6 CALIBRATION AND ADJUSTMENT........................................................... 55 Preparations Before the Calibration .................................... 56 Relative Humidity Calibration and Adjustment (in Two Points) .................................................................... 56 Low End Adjustment .............
User's Guide _______________________________________________________________________ List of Figures Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Figure 12 Figure 13 Figure 14 Figure 15 Figure 16 Figure 17 Figure 18 Figure 19 Figure 20 Figure 21 Figure 22 Figure 23 MMT310 Transmitter Parts ...................................................... 15 MMT310 Probes .......................................................................
Chapter 1 _________________________________________________________ General Information CHAPTER 1 GENERAL INFORMATION This chapter provides general notes for the manual and the MMT310. About This Manual This manual provides information for installing, operating, and maintaining Vaisala HUMICAP® Moisture and Temperature Transmitter Series for Oil MMT310 (MMT317 and MMT318).
User's Guide _______________________________________________________________________ Version Information Table 1 Manual Code M210474EN-C M210474EN-B Manual Revisions Description March 2014. This manual. New software functionality applicable from version 2.0.1 onward. Voltage output added to analog output options, new voltage parameters in the AMODE command. Added information on rain shield, sampling cell, MI70 hand-held indicator, and USB connection. Transmitter plastic housing material changed to PPS.
Chapter 1 _________________________________________________________ General Information Safety The Vaisala HUMICAP® Moisture and Temperature Transmitter Series for Oil MMT310 is delivered to you tested for safety and approved as shipped from the factory. Note the following precautions: WARNING Ground the product and verify outdoor installation grounding periodically to minimize shock hazard. CAUTION Do not modify the unit. Improper modification can damage the product or lead to malfunction.
User's Guide _______________________________________________________________________ Recycling Recycle all applicable material. Dispose of the unit according to statutory regulations. Do not dispose of with regular household refuse. Regulatory Compliances MMT310 complies with the following performance and environmental test standards: - EN 61326-1, Industrial environment.
Chapter 1 _________________________________________________________ General Information Software License This product contains software developed by Vaisala. Use of the software is governed by license terms and conditions included in the applicable supply contract or, in the absence of separate license terms and conditions, by the General License Conditions of Vaisala Group. Warranty Visit our Internet pages for standard warranty terms and conditions: www.vaisala.com/warranty.
User's Guide _______________________________________________________________________ This page intentionally left blank.
Chapter 2 ___________________________________________________________ Product Overview CHAPTER 2 PRODUCT OVERVIEW This chapter introduces the features, advantages, and the product nomenclature. Introduction to MMT310 Series The Vaisala HUMICAP® Moisture and Temperature Transmitter Series for Oil MMT310 is a small-size oil moisture and temperature transmitter that powers up with 10 ... 35 VDC (mode-dependent power supply requirements).
User's Guide _______________________________________________________________________ Vaisala HUMICAP moisture in oil transmitters MMT318 and MMT317 are designed for industrial applications. They measure water in oil in terms of water activity (aw) which can be determined as follows: water activity indicates the amount of oil in the scale of 0 - 1 aw. In this scale, 0 aw is an indication of completely water free oil and 1 aw an indication of oil fully saturated with water. Water is present in free form.
Chapter 2 ___________________________________________________________ Product Overview MMT310 Transmitter Parts 1403-179 Figure 1 MMT310 Transmitter Parts The following numbers refer to Figure 1 above: 1 = Transmitter unit 2 = Mounting plate (smaller mounting plate also available) 3 = Connector for signal output and power supply. Available with female connector with 5 m cable or screw terminal connector.
User's Guide _______________________________________________________________________ Probe Options 1311-199 Figure 2 MMT310 Probes The following numbers refer to Figure 2 above: 1 = MMT317 probe with optional Swagelok connector for tight-place installations. 2 = MMT318 probe for pressurized pipelines with two adjustable probe lengths and optional ball valve set.
Chapter 3 ________________________________________________________________ Installation CHAPTER 3 INSTALLATION This chapter provides you with information that is intended to help you install the MMT310. Mounting Selecting a Place for the Probe Select a place which gives a true picture of the process. Oil should circulate freely around the sensor; clear oil flow is recommended. Install the probe directly into the circulation system and not into the oil reservoir because of deposition.
User's Guide _______________________________________________________________________ Mounting the Transmitter/Removing the Transmitter Unit Select a place with stable conditions for mounting the transmitter. Do not expose the transmitter to direct sunlight or rain. Always mount the transmitter housing with the cable bushings pointing downwards. NOTE If the transmitter is mounted outdoors, cover it with a shelter (purchased by customer).
Chapter 3 ________________________________________________________________ Installation NOTE It is recommended that the supply is switched off before connecting the cable plug to transmitter during installation or service/calibration. Mounting the Transmitter with Optional Rain Shield If you mount MMT310 outdoors, use a shelter to protect the transmitter. An MMT310 rain shield is available from Vaisala as an optional accessory (order code ASM211103).
User's Guide _______________________________________________________________________ You can mount the rain shield and transmitter directly to a wall with screws through both the mounting plate and the rain shield, or attach the transmitter mounting plate to the rain shield and use for example U-bolt mounting depending on the requirements of the installation site. For rain shield measurements, see section Rain Shield Dimensions on page 71.
Chapter 3 ________________________________________________________________ Installation The following two fitting body options are available: - Fitting Body ISO1/2 solid structure (DRW212076SP) - Fitting Body NPT1/2 solid structure (NPTFITBODASP) Table 4 Type Standard Optional MMT318 Pipe Dimensions Pipe Dimension 178 mm 400 mm Adjustment Range 120 mm 340 mm Use teflon tape or thread sealant to seal the connection between the fitting body and the process/ball valve.
User's Guide _______________________________________________________________________ 0505-276 Figure 7 Tightening the Clasp Nut The following numbers refer to Figure 7: 1 2 3 4 = = = = Probe Clasp nut Fitting screw Pen (for marking) NOTE Take care not to overtighten the clasp nut to avoid difficulties when opening it. CAUTION Take care not to damage the probe body. A damaged body makes the probe less tight and may prevent it from going through the clasp nut.
Chapter 3 ________________________________________________________________ Installation Ball Valve Installation Kit for MMT318 The optional ball valve installation kit (Vaisala order code: BALLVALVE-1) is preferred when connecting the probe to a pressurized process or pipeline. Use the ball valve set or a 1/2" ball valve assembly with a ball hole of Ø14 mm or more. If you install the sensor head (Ø 12 mm) in a process pipe, please note that the nominal size of the pipe must be at least 1 inch (2.54 cm).
User's Guide _______________________________________________________________________ NOTE The probe can be installed in the process through the ball valve assembly provided that the process pressure is less than 10 bars. This way, the process does not have to be shut down when installing or removing the probe. However, if the process is shut down before removing the probe, the process pressure can be max. 20 bars.
Chapter 3 ________________________________________________________________ Installation If you wish to remove the probe from the process, note that you have to pull the probe out far enough. You cannot close the valve if the groove on the probe body is not visible. Sampling Cell for MMT318 It may be necessary to use a sampling cell if the MMT318 probe cannot be installed directly into the process pipe, for example, if the pipe is too small for the probe.
User's Guide _______________________________________________________________________ MMT317 Probe with Swagelok Connector for Tightplace Installations The Swagelok installation kit for MMT317 includes a Swagelok connector with ISO3/8" thread (Vaisala order code: SWG12ISO38) or NPT1/2" thread (Vaisala order code: SWG12NPT12).
Chapter 3 ________________________________________________________________ Installation Mount the MMT317 as follows: 1. Select the correct connector for the installation. The connector options are: a. R3/8" ISO (Swagelok code SS-12M0-1-6RTBT) b. 1/2" NPT (Swagelok code SS-12M0-1-8BT) Note that the connector inner diameters extend for Ø12 mm probe. 2. 3. 4. Check that the probe position is correct.
User's Guide _______________________________________________________________________ Connections When the MMT310 leaves the factory, the measurement ranges, output scaling and quantities have already been set according to the customer order. The unit is calibrated at the factory and ready for use.
Chapter 3 ________________________________________________________________ Installation Power Supply Requirements The minimum supply voltage required by the MMT310 transmitter depends on the output type and pressure: - RS-232 output: 10 ... 35 VDC. - Analog output: 15 ... 35 VDC. - Pressures above 10 bara (145 psia): minimum 24 VDC. Table 5 below lists the MMT310 current consumption according to output type.
User's Guide _______________________________________________________________________ This page intentionally left blank.
Chapter 4 _________________________________________________________________ Operation CHAPTER 4 OPERATION This chapter contains information that is needed to operate the MMT310. Power Supply Use a 10 … 35 VDC power supply (required minimum voltage varies depending on the operating environment and output type). For instructions on selecting the correct operating voltage, see section Power Supply Requirements on page 29.
User's Guide _______________________________________________________________________ Serial Line and Analog Communication Options MMT310 measurement data can be accessed with the following serial or analog options: - RS-232 serial port connection to a computer - Analog output (current or voltage) For temporary access, you can also connect to the transmitter with the following: - USB connection to a computer using an optional USB cable (238607) - Connection to a hand-held MI70 indicator using an optional MI
Chapter 4 _________________________________________________________________ Operation USB Connection MMT310 can be connected to a computer by using a USB cable (order code 238607). The USB cable is an optional accessory: for more information on ordering optional items, see section Spare Parts and Accessories on page 69. NOTE Before starting to use the USB cable, you must install the USB cable driver (requires Windows).
User's Guide _______________________________________________________________________ Connection to an MI70 Hand-held Indicator MMT310 can be connected to the hand-held MI70 indicator with the MI70 connection cable (DRW216050SP). The MI70 connection cable is an optional accessory: for more information on ordering optional items, see section Spare Parts and Accessories on page 69.
Chapter 4 _________________________________________________________________ Operation Terminal Program Settings The instructions in this section describe how to connect a computer to the MMT310 using the PuTTY terminal application for Windows (available for download at www.vaisala.com). Perform the necessary cabling and configuration of the transmitter before following the instructions. Opening a Serial/USB Connection with PuTTY 1. 2. 3. Power up the MMT310 and start the PuTTY application.
User's Guide _______________________________________________________________________ List of Serial Commands All commands can be issued either in uppercase or lowercase. In the command examples, the keyboard input by the user is in bold type. The notation refers to pressing the carriage return (Enter) key on your computer keyboard. Enter a to clear the command buffer before starting to enter commands. In the following command tables, the bold text in the brackets is the default setting.
Chapter 4 _________________________________________________________________ Operation Table 9 Setting, Scaling and Testing Analog Outputs Command AMODE Description Set analog outputs (0/4 ...
User's Guide _______________________________________________________________________ Measurement Output Starting the Continuous Reading Output Syntax: R Starts output of measurements to the peripheral devices (RUN mode). While the measurement output is active the only command that can be given is S (stop). The output mode can be changed with the FORM command. Example: >r aw= aw= 0.2000 aw T= 0.2000 aw T= 25.09 'C … 25.
Chapter 4 _________________________________________________________________ Operation Output Reading Once Syntax in STOP-mode: SEND Syntax in POLL-mode: SEND aa Where aa = Address of the transmitter when more than one transmitter is connected to a serial bus (0 ... 99). Example: >send aw= 0.2 aw T= -47.37 'C … If the value is too long to fit to the allocated space or if there is an error in outputting, the value is displayed with stars ‘*’. For example, aw=*.* aw T= 31.
User's Guide _______________________________________________________________________ Example: >smode run Output mode : RUN >r 02:08:01.03 aw= 02:08:04.21 aw= >smode stop Output mode 0.2 aw T= 0.2 aw T= -47.13 'C … -47.
Chapter 4 _________________________________________________________________ Operation Temporarily Open Transmitter from POLL Mode to Receive Serial Commands Syntax: OPEN nn Where nn = Address of the transmitter (0 ... 99) The OPEN command sets the bus temporarily in STOP mode so that the SMODE command can be issued.
User's Guide _______________________________________________________________________ Output Formatting Set Serial Output Format Syntax: FORM x Where x = Formatter string The FORM command can be used to change the output format of the SEND and R commands. A formatter string consists of quantities and modifiers: use the modifiers presented in Table 11 and quantities presented in Table 12 when configuring the output format. Use the FORM / command to return the default output form. Table 11 Modifier x.
Chapter 4 _________________________________________________________________ Operation Set Time and Date Syntax: TIME Syntax: DATE Sets the time and date to the transmitter. Example: >time Current time is 04:12:39 Enter new time (hh:mm:ss) ? 12:24:00 >date Current date is 2000-01-01 Enter new date (yyyy-mm-dd) ? 2013-06-30 > NOTE Time and date are cleared to 2000-01-01 00:00:00 at reset. NOTE Only about 1 % accuracy is obtained with the software clock.
User's Guide _______________________________________________________________________ Select Metric or Nonmetric Output Units Syntax: UNIT x Where x = M or N M = metric units N = nonmetric units Quantity aw water activity T Temperature ppm (for transformer oil only) Metric Unit Non-Metric Unit aw T °C ppm ppm Setting, Scaling and Testing the Analog Outputs You can select for the two outputs - current or voltage range (0...20 mA/4...
Chapter 4 _________________________________________________________________ Operation NOTE 1 … 5 V output can be selected when ordering the device. The 1 .. 5 output is based on the 0 … 5 V output mode, but has been adjusted to 1 … 5 V by scaling the valid range to 1 … 5. In the scaled 1 … 5 V output mode, 0 V is reserved for error output (AERR set to 0). If the output includes the reminder 'remember to set jumpers', ignore the reminder.
User's Guide _______________________________________________________________________ Scale Analog Outputs Syntax: ASCL Example: >ascl Ch1 T Ch1 T Ch2 ppm Ch2 ppm >ascl Ch1 T Ch1 T Ch2 ppm Ch2 ppm lo hi lo hi : : : : -40.00 60.00 0.00 5000.00 'C 'C ppm ppm ? ? ? ? lo hi lo hi : : : : -20.00 40.00 0.00 3000.00 'C 'C ppm ppm ? ? ? ? -20 40 0 3000 The ppm calculation is only used for transformer oils. Test Analog Outputs Syntax: ITEST aa.aaa bb.
Chapter 4 _________________________________________________________________ Operation Test Analog Outputs for Desired Readings Syntax: AQTEST x yyy.yyy Using the AQTEST command, you can test the analog output by forcing the output to correspond to a chosen value. Where x yyy.yyy = = Output quantity (aw / T / ppm) Value For example: >aqtest aw 0.5 CH1 aw : 0.5000 aw CH2 T : 22.3 'C > 10.000mA 7.
User's Guide _______________________________________________________________________ Other Commands Check Transmitter Settings Syntax: ? Syntax: ?? Use the ? command to check the current transmitter configuration. The ?? command is similar but can also be used if the transmitter is in POLL mode. Example (factory default settings): >? MMT310 / 1.03 PRB serial nr : Calibration : Cal.
Chapter 4 _________________________________________________________________ Operation Serial Bus Echo Syntax: ECHO x Where x = ON/OFF (default = ON) The command enables or disables echo of characters received over the serial line. All Devices in POLL Mode Send Their Addresses Syntax: FIND List Commands Syntax: HELP Set Result Filtering Syntax: FILT xx Enable or disable the filtering or select the extended filter to reduce noise of the measurement.
User's Guide _______________________________________________________________________ Reset Transmitter Syntax: RESET This command resets the device, resulting in a short start-up delay. The serial interface mode (STOP, RUN or POLL) selected with the SMODE command is taken into use at restart. Display Error Messages Syntax: ERRS Display transmitter error messages. If there are no errors present, a PASS will be returned.
Chapter 5 _______________________________________________________________ Maintenance CHAPTER 5 MAINTENANCE This chapter provides information that is needed in basic maintenance of the MMT310. Periodic Maintenance Calibration Interval MMT310 is fully calibrated and adjusted as shipped from factory. Typical calibration interval is one year. In certain applications it may be advisable to do more frequent checks.
User's Guide _______________________________________________________________________ When replacing the filter, wear clean gloves to avoid depositing dirt or oil on the filter. Replace the filter as follows: 1. 2. 3. 4. Turn the filter counterclockwise until it is loose. Pull the filter straight out carefully. Do not damage the sensor. Take the new filter, and insert it to the filter thread. Tighten the new filter to 5 Nm by turning it clockwise.
Chapter 5 _______________________________________________________________ Maintenance Clean the Sensor Before Storing the Transmitter Clean the used sensor with instrument air to blow out existing oil or gently first flush with heptane (C7H16) and dry with instrument air to prevent oxidation of the sensor. The oxidation of the sensor can cause extended response times or drifting. Technical Support For technical questions, contact Vaisala technical support by e-mail at helpdesk@vaisala.com.
User's Guide _______________________________________________________________________ This page intentionally left blank.
Chapter 6 ____________________________________________________ Calibration and adjustment CHAPTER 6 CALIBRATION AND ADJUSTMENT This chapter describes the calibration and adjustment procedures. Note that after adjustment, the original calibration certificate shipped with the product is not valid anymore. The MMT318 and MMT317 are calibrated as shipped from the factory. Typical calibration interval is one year. Depending on the application it may be good to make the first calibration check earlier.
User's Guide _______________________________________________________________________ Preparations Before the Calibration Before calibration, clean the used sensor with instrument air to blow out existing oil, or gently first flush with heptane (C7H16) and dry with instrument air to decrease response time. NOTE It is important to clean the sensor before calibration as a dirty sensor can contaminate the salt bath and change the reference condition.
Chapter 6 ____________________________________________________ Calibration and adjustment Low End Adjustment 1. 2. 3. 4. 5. Remove the transmitter unit from the mounting plate (see page 18), and press the adjustment button once (see Figure 15 on page 56). Remove the filter from the probe and insert the probe head into a measurement hole of the dry end reference chamber (for example LiCl: 11 % RH in the humidity calibrator HMK15, use the adapter fitting (13.5 mm)).
User's Guide _______________________________________________________________________ High End Adjustment 6. 7. 8. After you have performed the low end adjustment, insert the probe head into a measurement hole of the high end reference chamber (e.g. NaCl: 75 % RH chamber in the humidity calibrator HMK15, use the adapter fitting (13.5 mm)). Note that the difference between the two humidity references must be at least 50% RH. Let the probe stabilize at least 30 minutes.
Chapter 6 ____________________________________________________ Calibration and adjustment Temperature Calibration and Adjustment (in One Point) 1. 2. 3. 4. 5. 6. Remove the transmitter unit from the mounting plate (see page 18) and press the adjustment button once (see Figure 15 on page 56). Remove the probe filter (see instructions on page 51) and insert the probe into the reference temperature. Let the sensor stabilize. Enter the command CT and press Enter.
User's Guide _______________________________________________________________________ Revert Factory Calibration Syntax: LI 1. 2. 3. Remove the transmitter unit from the mounting (see page 18) and press the adjustment button once (see Figure 15 on page 56). Issue the LI command and set the offset value to 0 and gain value to 1. >li RH offset RH gain T offset T gain > : : : : -0.6000000 1.00000000 0.00000000 0.40000000 ? ? ? ? 0 1 0 1 Reset the transmitter by giving the RESET command.
Chapter 6 ____________________________________________________ Calibration and adjustment Relative Humidity Calibration after Sensor Change Syntax: FCRH The transmitter asks and measures relative humidity and calculates the calibration coefficients. This two-point adjustment needs to be performed after a sensor change. Follow the more detailed calibration instructions on page 56, but instead of the CRH command, use the FCRH command. >FCRH RH : 1.82 1. ref ? Press any key when ready... RH : 74.22 2.
User's Guide _______________________________________________________________________ Analog Output Calibration Syntax: ACAL Connect the MMT310 to a multimeter in order to measure either current or voltage depending on the selected output type. Issue the ACAL command. Then type the multimeter reading and press Enter. Example (current outputs): >acal Ch1 Ch1 Ch2 Ch2 > I1 I2 I1 I2 (mA) (mA) (mA) (mA) ? ? ? ? 2.046 18.087 2.036 18.
Chapter 6 ____________________________________________________ Calibration and adjustment Use the arrow buttons to highlight RH or T and press SELECT to choose the parameter for adjustment. For RH adjustment instructions, see section Adjusting RH with MI70. For T adjustment instructions, see section Adjusting T with MI70. Adjusting RH with MI70 Selecting RH in the main adjustment menu brings up a notification about checking environment settings.
User's Guide _______________________________________________________________________ 5. To confirm the adjustment, press YES. To cancel entering the adjustment, press NO to return to the adjustment mode display without making any changes. Note that if the difference between the two references is less than 50 %, adjustment cannot be done. Once confirmed, the adjustment has been carried out. Press BACK to exit the RH adjustment mode and return to the main adjustment options.
Chapter 6 ____________________________________________________ Calibration and adjustment Adjusting T with MI70 Selecting T in the main adjustment menu brings up the current T measurement. Select ADJUST to choose the adjustment type. The following T adjustment options are available: - 1-point adjustment - 2-point adjustment NOTE Temperature adjustment in one or two points can be done if there is reason to believe that the adjustment is changed.
User's Guide _______________________________________________________________________ 4. Give the higher reference temperature by using the arrow buttons and press OK. 5. To confirm the adjustment, press YES. To cancel entering the adjustment, press NO to return to adjustment mode display without making any changes. Once confirmed, the adjustment has been carried out. Press BACK to exit the T adjustment mode and return to the main adjustment options.
Chapter 7 _____________________________________________________________ Technical Data CHAPTER 7 TECHNICAL DATA This chapter provides the technical data of the MMT310. Specifications Table 14 Water Activity Property Measurement range aw Accuracy (including nonlinearity, hysteresis and repeatability) When calibrated against salt solutions (ASTM E104-85): Response time (90 %) at +20 °C in still oil (with stainless steel filter) Sensor Table 15 Description / Value 0...1 (@-40...+180 °C/ -40...
User's Guide _______________________________________________________________________ Table 16 Electrical Connections Property Two analog outputs: selectable and scalable Typical accuracy of analog output at +20 °C (+68 °F) Typical temperature dependence of analog output Serial output Connections Operating voltage Power consumption (Vsupply=35VDC) External load Startup time after powerup Table 17 Description / Value Current: 0…20 mA or 4…20 mA Voltage: 0 … 5 V or 0 … 10 V (1 ..
Chapter 7 _____________________________________________________________ Technical Data Spare Parts and Accessories Information on spare parts, accessories, and calibration products is available online at www.vaisala.com and store.vaisala.com.
User's Guide _______________________________________________________________________ Dimensions in mm (inches) Transmitter Enclosure and Mounting Plates 1 2 0507-049 Figure 16 Transmitter Enclosure and Mounting Plate Dimensions The following numbers refer to Figure 16 above.
Chapter 7 _____________________________________________________________ Technical Data Rain Shield Dimensions 1311-252 Figure 17 Rain Shield Dimensions (Back) 1311-253 Figure 18 Rain Shield Dimensions (Side and Outer) VAISALA ________________________________________________________________________ 71
User's Guide _______________________________________________________________________ MMT318 Probe Dimensions Probe pushed down Probe up A: Probe 180 mm, adjustment range 120 mm A 35 - 157/379 (1.37 - 6.2/14.9) R ½" ISO 7/1 or tapered NPT ½" 188/410 (7.40/16.1) 226/448 (8.90/17.6) Parallel thread Probe 400 mm, adjustment range 340 mm Ø 13.5 (0.53) Ø 12 (0.
Chapter 7 _____________________________________________________________ Technical Data Ball Valve Set Dimensions 1401-015 Figure 20 Ball Valve Set Dimensions VAISALA ________________________________________________________________________ 73
User's Guide _______________________________________________________________________ MMT317 Probe with Optional Swagelok Connector, Dimensions 0509-148 Figure 21 MMT317 Probe with Swagelok Connector 74 ___________________________________________________________________ M210474EN-C
Appendix A ______________________________________________________________ Applications APPENDIX A APPLICATIONS This appendix describes typical applications where MMT310 is used. Transformer Oils The determination of moisture in oil is an essential part of a comprehensive transformer maintenance program. Oil immersed transformers rely on the oil for cooling, protection from corrosion and as an important component of their insulation.
User's Guide _______________________________________________________________________ Figure 22 below illustrates the water solubility of mineral transformer oil as a function of temperature. The margins show the range of variation of water solubility found in mineral oils. 1311-205 Figure 22 The Water Solubility of Transformer Oils Versus Temperature PPM Calculation for Transformer Oils Traditionally, moisture in transformer oil is measured in ppm units.
Appendix A ______________________________________________________________ Applications Calculation Model with Average Coefficients The calculation model of MMT318 and MMT317 is based on the average water solubility behaviour of transformer oils. The ppm output is calculated as follows: ppm = aw × 10 Where (A/(T+273.16)+B) (1) aw= water activity A,B= coefficients (average/oil specific) T= temperature (ºC) Generally, measurements with MMT318 and MMT317 have an accuracy better than 10 % of the reading.
User's Guide _______________________________________________________________________ PPM Calculation Setting Calculation Setting (Calculation Model with Average Coefficients) Give the OIL ON command when you are measuring moisture in oil and want to have ppm output. Syntax: OIL x x= ON/OFF Example: >oil on Oil ppm >oil Oil ppm Oil[0] Oil[1] > : ON : : : ON -1.66269994E+03 7.36999989E+00 Changing the Calculation Coefficients (Calculation Model with Oil Specific Coefficients) 1. 2. 3. 4. 5.
Appendix A ______________________________________________________________ Applications Technical Data Typical measuring range 0...80* ppm (0...100ºC) *Upper edge limited to saturation Accuracy (Calculation Model with Average Coefficients) Temperatures > 30 ºC: better than 10 % of the reading Temperatures < 30ºC: see Figure 23 below. 1311-206 Figure 23 Maximum Errors Caused by Deviation of Mineral Oils Using Calculation Model with Average Coefficients Temperature Measurement range -40...
User's Guide _______________________________________________________________________ Paper Machine Application Typically, a paper machine contains two or three separate lubrication systems. Usually, one is located at the wet end and the other at the dry end. There is a certain amount of free moisture constantly present which means that there is a risk of this moisture coming into contact with the machine bearings.
www.vaisala.
