OPERATING INSTRUCTIONS FOR Model 6750 Total Organic Carbon Analyzer P/N M ECO: DANGER Toxic gases and or flammable liquids may be present in this monitoring system. Personal protective equipment may be required when servicing this instrument. Hazardous voltages exist on certain components internally which may persist for a time even after the power is turned off and disconnected. Only authorized personnel should conduct maintenance and/or servicing.
Model 6750 Copyright © 2005 Teledyne Instruments/ Analytical Instruments All Rights Reserved.
Total Organic Carbon Analyzer Specific Model Information Instrument Serial Number: _______________________ Instrument Range: _______________ Calibrated for: _______________ Background Gas: _______________ Zero Gas: _______________ Span Gas: _______________ Teledyne Analytical Instruments iii
Model 6750 Safety Messages Your safety and the safety of others is very important. We have provided many important safety messages in this manual. Please read these messages carefully. A safety message alerts you to potential hazards that could hurt you or others. Each safety message is associated with a safety alert symbol. These symbols are found in the manual and inside the instrument.
Total Organic Carbon Analyzer IF YOU USE THE ANALYZER IN A MANNER OTHER THAN THAT FOR WHICH IT WAS INTENDED, UNPREDICTABLE BEHAVIOR COULD RESULT POSSIBLY ACCOMPANIED WITH HAZARDOUS CONSEQUENCES. This manual provides information designed to guide you through the installation, calibration operation and maintenance of your new analyzer. Please read this manual and keep it available.
Model 6750 Table of Contents List of Figures.............................................................................. ix List of Tables ............................................................................... xi Introduction .................................................................................. 1 1.1 Main Features of the Analyzer 1 1.2 Options 2 1.3 Typical Applications 2 1.4 Intended Use of the Analyzer 2 1.5 Operator Interface 3 Theory of Operation ...............................
Total Organic Carbon Analyzer 3.3 Electrical Connections 3.3.1 Power Connection 3.3.2 Analog Outputs 3.3.3 Alarm Connections 3.3.4 RS-232 Serial Connection 3.4 Gas/liquid Connections 3.4.1 Liquid Connections 3.4.2 Gas Connections 3.5 Checking the System 23 23 24 25 25 25 25 26 27 Setup and Operation...................................................................29 4.1 Analyzer Startup 29 4.2 Menus 31 4.2.1 Run Mode 31 4.2.2 Parameter Menu 32 4.2.3 Alarm Settings 33 4.2.4 Stream Sequencer 34 4.2.
Model 6750 5.3.8 UV Power Supply 5.3.9 Mass Flow Controller (P/N ST18001A) 5.3.10 Metering Valve (P/N ST16050) 5.3.11 Sparger (P/N ST20025) 5.3.12 Pumps 5.3.12.1 Pump Motor Replacement 5.3.12.2 Pump Head Tubing Replacement 5.3.13 4-20 mA Adjustment Procedure 5.3.13.1 Setting 100 mV Control Voltage 5.3.13.2 Setting of 4-20 mA output 58 59 60 61 63 63 65 67 68 68 Appendix..................................................................................... 69 A.1Specifications 69 A.2 Parts Listing 71 A.
Total Organic Carbon Analyzer List of Figures Figure 1-1: The Model 6750 TOC Analyzer (Front door removed) . 3 Figure 2-1: NPOC or TOC – Direct Method.................................... 6 Figure 2-2: TOC – True Method ..................................................... 6 Figure: 2-3: TOC Measurement Basics .......................................... 8 Figure 2-4: UV/Persulfate Method .................................................. 8 Figure 2-5: Comparison of TOC Measurement Technologies........
Model 6750 Figure 5-6: DC Power Supply Module........................................... 54 Figure 5-7: Replacing CE Computer ............................................. 55 Figure 5-8: UV Lamp Replacement .............................................. 56 Figure 5-9: Removing the UV Reactor Assembly.......................... 57 Figure 5-10: Removing the UV Power Supply............................... 59 Figure 5-11: Mass Flow Controller ................................................
Total Organic Carbon Analyzer List of Tables Table 4-1: Preparation of Standards (TOC/TIC) ............................37 Table 5-1: Troubleshooting ...........................................................
Model 6750 DANGER COMBUSTIBLE GAS USAGE WARNING This is a general purpose instrument designed for use in a non-hazardous area. It is the customer's responsibility to ensure safety especially when combustible gases are being analyzed since the potential of gas leaks always exist. The customer should ensure that the principles of operating this equipment are well understood by the user.
Total Organic Carbon Analyzer Introduction Introduction Teledyne Model 6750 Total Organic Carbon Analyzer provides accurate and reliable on-line TOC analysis with Windows™ CE Operation, using the UV/Heated Persulfate Oxidation Method. This manual includes all necessary information to help you install, operate and service your Analyzer. The Model 6750 TOC Analyzers have been designed for easy operation and maintenance.
Introduction Model 6750 • RS-232C and RS-485 outputs • Separate electronics and liquid compartments 1.2 Options The following options are available for the Model 6750 TOC Analyzer and are described in Appendix A.3: • Correlated BOD/COD • Dual NDIR Analyzers • Benchmark/Auto Validation • Auto-Cal/Auto-Clean • Automatic Multi-Range • Multi-Stream Analysis • DBPR Drinking Water 1.
Total Organic Carbon Analyzer Introduction All other types of usage beyond the intended use stated above, are considered as misuse of the analyzer. The supplier assumes no responsibility for damage incurred as the result of misuse of the product. 1.5 Operator Interface The Model 6750 Analyzer is housed in a rugged metal case and may be wall or rack mounted for operator convenience.
Introduction Model 6750 Teledyne Analytical Instruments 4
Total Organic Carbon Analyzer Theory of Operation Theory of Operation 2.1 Overview The Model 6750 Analyzer uses the UV/Heated Persulfate method of analysis and is well-suited for many applications involving accurate TOC analysis. The basic analyzer is configured for maximum utility using an advanced Microsoft™ Windows-based CE computer with touch screen. The analyzer is suitable for both general purpose and/or hazardous area classifications, if properly configured with required safety equipment. 2.
Theory of Operation Model 6750 To perform correct TOC analysis, the analysis system must be capable of measuring all constituents of organic carbon present in the sample: Non-Purgeable Organic Carbon (NPOC) and Purgeable Organic Carbon (POC). Correct TOC analysis must also exclude the Total Inorganic Carbon (TIC) interference. Figure 2-1 is a basic, commonly used technique to measure the NPOC, sometimes referred to as “TOC-Direct”.
Total Organic Carbon Analyzer Theory of Operation (sparges) the CO2 converted from the TIC and it is measured by an independent CO2 detector as “TIC”. POC is also stripped from the sample in the sparger as HC, but the HC is undetected by the CO2 detector and does not interfere with the TIC measurement. A portion of the same sample is also directed to the oxidation reactor, where inorganic and all organic carbon is converted to CO2 and detected by a second CO2 detector as “Total Carbon”.
Theory of Operation Model 6750 Figure: 2-3: TOC Measurement Basics Figure 2-4: UV/Persulfate Method Teledyne Analytical Instruments 8
Total Organic Carbon Analyzer Theory of Operation 2.3 The UV/Heated Persulfate Method of Analysis In the UV/Heated Persulfate Method as used by the Model 6750, the sample is initially mixed with acid and directed to the sparger. For TOC-Direct (NPOC) analysis, the CO2 converted from the inorganic carbon is sparged out of solution by the carrier gas and vented to atmosphere. Any volatile organic loss would occur at this point, exiting the sparger as HC gas.
Theory of Operation Model 6750 Figure 2-5: Comparison of TOC Measurement Technologies Teledyne Analytical Instruments 10
Total Organic Carbon Analyzer Theory of Operation 2.4 Subsystems Principles of Operation The Model 6750 TOC Analyzer is comprised of five subsystems: 1. Sample Handling 2. Inorganic Carbon Removal – OR – Inorganic Carbon Analysis/TOC-True Method 3. Oxidation 4. NDIR CO2 Gas Detection 5. Electronic Signal Processing, Display and Control The sample system is designed to accept the liquid sample and any required reagents, transporting them through the analyzer to the appropriate components.
Theory of Operation Model 6750 actual measurement of the TIC, a more accurate TOC is achieved since (TOC = TC - TIC). “TOC-Direct” mode is preferred for accuracy when no or little volatiles are present. In this mode, the carbonate-free sample is extracted from the organic carbon reactor and measured directly as TOC. Pump (P –1) continuously introduces the carbonate-free sample to the reactor. No valves or complicated injection mechanisms are required.
Total Organic Carbon Analyzer Theory of Operation Figure 2-7: Sample Handling TOC-True 2.4.2.2 GAS PHASE SAMPLE HANDLING Referencing Figure 3-5 and “As Built” drawings in the Appendix, a carrier gas of (99.8%) pure oxygen or CO2 and hydrocarbon-free air is required. Erroneous TOC analysis will occur if the carrier gas has these impurities, since both CO2 and Hydrocarbon gases will contribute a higher TOC value to the analysis than is actually present in the sample.
Theory of Operation Model 6750 TOC analysis in a continuous, on-line TOC analyzer. The CO2 generated by the oxidation of carbon in the reactor is read by the NDIR as a percentage concentration of the CO2 in the carrier gas. CO2 (TOC) CO2 (TOC) + Carrier Any increase or decrease of the carrier flow rate will have a corresponding inverse effect on TOC reported value, (eg. double the carrier flow rate, reported TOC will approximate ½ of actual sample TOC concentration).
Total Organic Carbon Analyzer Theory of Operation be reduced to approximately 2.0 to 3.0. If the sample pH is not properly reduced as described in Figure 2-8, increase the normalcy of the acid reagent until the water exiting the sparger drain is between 2.0 and 3.0. Figure 2-8: Relationship Between TIC and pH 2.4.3 Oxidation The UV reactor and persulfate reagent provide oxidation of the carbon to CO2.
Theory of Operation Model 6750 The construction of the patented UV reactor in the Model 6750 affords superior oxidation by precisely controlling the sample temperature, adding a precise amount of ultra-pure persulfate reagent (P/N ST40000) and precisely controlling the carrier gas flow rate. Pump (P-1) continuously meters a precise amount of carbonate-free sample from the sparger to the UV reactor. Pump (P-3) continuously meters a precise amount of persulfate reagent to the reactor.
Total Organic Carbon Analyzer Theory of Operation 2.4.4 NDIR CO2 Gas Detection The key component for reliable TOC analysis is the precise and interference-free detection of CO2. The Model 6750 NDIR unit requires very little maintenance because of its ability to handle the corrosive gases generated in TOC analysis. This is due in part to its non-reflective borosilicate sample cell. It has no moving parts which further reduces the maintenance load and it uses an internal self-calibrating technique.
Theory of Operation Model 6750 requires no wall reflectivity and is completely resistant to corrosive gases. The NDIR unit requires no optical chopper motor or mechanical devices but utilizes a single flashing infrared source to optically “chop” the infrared (IR) beam, which equally irradiates CO2/reference detectors. Using a reference eliminates water vapor interference. The nonreflective, corrosive resistant sample cell removes the requirement for chemically removing acid gases prior to detection.
Total Organic Carbon Analyzer Theory of Operation 2.4.5.1 BENCHMARK/AUTO-VALIDATION Benchmark is the European NAMUR* specified validation technique, whereby on command a chemical calibration standard is automatically introduced to the analyzer and the response is compared to the previous analyzer calibration. If the response falls within a certain specified limit, the computer/output indicates “Benchmark Passed”.
Theory of Operation Teledyne Analytical Instruments Model 6750 20
Total Organic Carbon Analyzer Installation Installation This manual contains “AS BUILT” drawings and a parts list to aid in the installation and operation of the analyzer. These drawings should be referred to when ordering spare parts, operating or servicing the equipment. See the Appendix for the AS BUILT drawing package. Installation of the Model 6750 On-line UV/Heated Persulfate TOC Analyzer includes: 1. Unpacking 2. Mounting 3. Electrical Connections 4. Gas Connections 5. Testing the System 3.
Installation Model 6750 Figure 3-1: Analyzer Dimensions Figure 3-2: Required Door Clearance Teledyne Analytical Instruments 22
Total Organic Carbon Analyzer Installation All operator controls and serviceable components are mounted on the control panel, which is hinged and doubles as the door that provides access to those components not normally requiring maintenance. Internal components of the Model 6750 TOC Analyzer are shown in Figure 3-3. Figure 3-3: Internal Components of the Model 6750 Analyzer 3.
Installation Model 6750 • Power Connection Universal AC Power Source • Primary Input Power CAUTION: POWER IS APPLIED TO THE INSTRUMENT’S CIRCUITRY AS LONG AS THE INSTRUMENT IS CONNECTED TO THE FACILITY POWER SOURCE. THE FACILITY MUST HAVE AN EXTERNAL POWER SWITCH TO REMOVE PRIMARY POWER FROM THE ANALYZER. • Analog Output Connections • Alarm Connections Figure 3-4 shows where the electrical connections are made to the instrument. 3.3.
Total Organic Carbon Analyzer Installation 3.3.3 Alarm Connections The Model 6750 is equipped with two concentration alarms and one analyzer malfunction alarm. The three alarm-circuit connectors use spring terminals for making connections to internal alarm relay connects. Each alarm provides a set of Form C contact with both normally open and normally closed contact connections. The contact connections are indicated by diagrams on the rear panel.
Installation Model 6750 • Reagents • Drain (s) Connect these lines as per Figure 3-4 and the AS-BUILT drawings in the Appendix. Make sure there are no restrictions or kinks in the sample lines. Figure 3-5: Gas and Liquid Connections to the Analyzer 3.4.
Total Organic Carbon Analyzer Installation With the exception of the vent and carrier gas inlet, all other gas connections are made on the same bottom panel as the liquid connections and are shown in Figure 3-5. The NDIR vent and carrier gas connections are made on the left side of the unit. Gas Carrier Connections: The facility carrier gas must be free of CO2 and hydrocarbons and be regulated to 15±2 psi and connected as shown in “As Built” Drawings in the Appendix).
Installation Model 6750 Teledyne Analytical Instruments 28
Total Organic Carbon Analyzer Setup and Operation Setup and Operation Once the analyzer has been installed, it can be configured to your application. To do this you will: • Set system parameters • Calibrate the instrument • Define the analysis range. Then choose auto-ranging or select a fixed range of analysis, as required. • Set alarm setpoints, and modes of alarm operation (latching, failsafe, etc.) 4.
Setup and Operation Model 6750 Figure4-1: Drain Connections 5. On initial start–up or after UV Reactor or Glass Liquid Separator (GLS) servicing, fill the U-Tube with D. I. water as indicated in Figure 4-2. 6. After all of the above checks, turn analyzer ON by activating the facility power switch. The system starts up in Run Mode. 7. Immerse line from “sample” port of the analyzer into D. I. water container. 8. Immerse persulfate line from the “persulfate” port of the analyzer into persulfate container.
Total Organic Carbon Analyzer Setup and Operation Figure 4-2: Gas Liquid Separator D. I. Filling After reagents and DI have filled all tubing lines, it is recommended to proceed with IR Calibration followed by cal (liquid calibration) of the system. Then the analyzer may be placed in service. 4.2 Menus The advanced design of the Model 6750 TOC Analyzer eliminates complicated, routine, and sometimes confusing menus. The operator/software interface is simple and easy to use.
Setup and Operation • The current TOC value, • [IR] IR response • [Flow] Carrier Gas Flow rate • [m] Available Memory (kb). Model 6750 4.2.2 Parameter Menu Although your analyzer has been optimally configured for your application, on initial startup the setup parameters should be verified Consult Factory Settings for Your Application – “As Built Drawings” in the Appendix. To get to the Parameters menu: 1. From the Run Screen, select [EDIT]. The following menu will appear.
Total Organic Carbon Analyzer Setup and Operation 2.
Setup and Operation Model 6750 From this menu verify or change the concentration alarm setpoints using the onscreen scroll arrows. 4.2.4 Stream Sequencer If your analyzer has been configured for a multi-stream sequencer (P/N ST200009), from the [Edit] Menu, select [Sequencer].
Total Organic Carbon Analyzer Setup and Operation 4.2.5 D/DBPR This optional utility allows convenient external pH calibration and input of alkalinity data consistent with the D/DBPR requirements If your analyzer has been configured for the D/DBPR option, from the following [Edit] Menu, select [D/DBPR].
Setup and Operation Model 6750 The following window is illustrative of the D/DBPR [Run] screen. 4.3 Detailed Calibration Procedures 1. Although the instrument has been calibrated to your specifications at the factory, it should be rechecked after satisfactory installation and periodically calibrated as suggested for your application. 2.
Total Organic Carbon Analyzer Setup and Operation Table 4-1: Preparation of Standards (TOC/TIC) 100 mg/Liter TOC (AS CARBON) 1000 mg/Liter TOC (AS CARBON) Ethylene Glycol .233 ml/L H20 2.33 ml/L H20 Methanol Ethanol .337 ml/L H20 .242 ml/L H20 3.37 ml/L H20 2.42 ml/L H20 Acetone Carbon Tetrachloride .204 ml/L H20 .807 ml/L H20 2.04 ml/L H20 8.07 ml/L H20 Sucrose Urea .238 gm/L H20 .500 gm/L H20 2.38 gm/L H20 5.
Setup and Operation CAUTION: Model 6750 SODIUM PERSULFATE IS A STRONG OXIDIZING AGENT. TAKE ALL NECESSARY PRECAUTIONS AS WITH HANDLING ANY CORROSIVE MATERIAL. ALL CHEMICALS, INCLUDING WATER, SHOULD BE REAGENT GRADE OR BETTER AND FREE OF CARBON-CONTAINING COMPOUNDS. THE CONTAINER USED SHOULD BE FLUSHED WITH DISTILLED OR DEIONIZED (DI) WATER. a. Dissolve 238 grams of ultra-pure reagent grade sodium persulfate (P/N ST40000) into one (1) liter of distilled water. b.
Total Organic Carbon Analyzer Setup and Operation Note: On the initial Startup, IR gas calibration should be performed prior to liquid calibration a. Select [CALIBRATE] from the main menu. The following screen will appear: b. Select [TOC]. The following screen appears: c. Flow “ZERO” (D. I. Water) and allow NDIR reading to stabilize. For maximum accuracy, especially at lower ranges, this process may take 20 minutes. When reading is stable, select [ZERO]. d. Flow Liquid Span Standard Solution.
Setup and Operation Model 6750 f. If the calibration is acceptable, select [OK] or [CANCEL] if not acceptable. The analyzer is now calibrated and ready for analysis. 4.4 Operation After proper installation and calibration, the instrument is ready to be placed “ON-LINE” for continuous operation. Note: For any non–standard or specific operational procedures, please refer to the “INSTALLATION” and “AS–BUILT” drawings in the Appendix or any Addenda that accompanies this manual.
Total Organic Carbon Analyzer Setup and Operation 4.5 Shutdown Prior to shutdown of the analyzer or performing service on the reactor, flush D. I. water through all sample and reagent lines for at least 30 minutes to clean all tubing. CAUTION: FAILURE TO OBSERVE ADEQUATE FLUSHING COULD RESULT IN HARMFUL ACID BURNS AND/OR A REACTOR CLOG. 4.6 Historical Data Previous data may be obtained by selecting [CHART] from the screen. The following menu will appear.
Setup and Operation Model 6750 To view the data produced in the last 24 hours, select [LAST 24 HOURS]. The following screen will appear: Using the Scroll Bar, select the data to be viewed. Selecting [HISTORICAL DATA] allows you to view any archived data within the memory limits of the computer. A screen appears which will allow you to select the archived time period desired. How far back you can go depends on the available memory.
Total Organic Carbon Analyzer Maintenance Maintenance 5.1 Compupter-aided Testing Prior to performing detailed troubleshooting procedures listed below, first perform computer-aided testing of the analyzer, as follows: 1. From the screen, select [TEST]. The following menu appears: 2. Select [SYSTEM DIAGNOSTICS].
Maintenance Model 6750 From this screen the operator may perform individual testing of components related to functionality and settings. 5.2 Troubleshooting If you are experiencing trouble with your instrument, refer to Table 5-1: Troubleshooting. Table 5-1: Troubleshooting PROBLEMS SOLUTION Check fuse & power connections. Look for loose or damaged wiring. Check for 12V DC from power supply. Check power supply fuse.
Total Organic Carbon Analyzer Maintenance 5.3 Module Service 5.3.1 NDIR (Gas Calibration) 1. From the Menu, select [CALIBRATE]. The following screen will appear: 2. Select [INFRARED ANALYZER]. The following Screen will appear: 3. Disconnect tubing from reactor output and connect IR calibration adapter (P/N ST20026) as shown in Figures 51, 5-2, and 5-3. 4.
Maintenance Model 6750 Figure 5-1: Disconnecting Tubing from Reactor Figure 5-2: IR Calibration Adapter P/N ST20026 Teledyne Analytical Instruments IR Calibration 46
Total Organic Carbon Analyzer Maintenance Figure 5-3: Installing Calibration Adapter 5. To set IR “Zero”, flow 200cc/minute oxygen (or CO2free air) for 5 minutes. Allow NDIR reading to stabilize. Select [ZERO]. NDIR reading is reset to 0. 6. To set IR “Span” for the 6 inch (shorter) IR bench, use a gas calibration standard mixture of 1% CO2 in pure nitrogen. For the longer (15 inch) bench, a gas mixture of 0.1% CO2 in pure nitrogen is required for.
Maintenance Model 6750 Figure 5-4: Removing the NDIR Unit P/N ST36000 To Replace the NDIR Unit: 1. Turn off power. 2. Remove inlet tube from NDIR Assembly. 3. Remove vent tube from NDIR Assembly. 4. Unplug interface cable from NDIR Assembly. 5. Remove NDIR Assembly from cabinet.
Total Organic Carbon Analyzer Maintenance • Remove insulation from IR Cell. • Remove lock-tight from three thumbnuts and remove. • Slide out and remove Source Assembly.
Maintenance Model 6750 • Remove IR Cell Assembly Note: a. ‘O’-Rings in each of Detector Assembly (left) and Source Assembly (right). b.
Total Organic Carbon Analyzer Maintenance • *Remove ‘O’-Ring and Sapphire window taking care to avoid scratching Sapphire window. *Recommend using toothpick. • Clean sapphire windows with a soft, lintless tissue (use DI water, if necessary). To Reassemble • Install IR Cell. • Install Source Assembly end piece.
Maintenance Model 6750 • Tighten three thumbnuts until Source Assembly bottoms out on squeeze nuts. • Recommend: Use alternate tightening sequence Note: IR Cell installed incorrectly. Large outlet port MUST go into Detector Assembly (left) • • • Insert lock-tight on three thumbnuts to prevent backoff. Install insulation. Replace assembly as before. Recalibrate NDIR (Section 4.3).
Total Organic Carbon Analyzer Maintenance 5.3.3 Master Interface Board (P/N ST13042-1). The Master Interface Board has no field adjustment. If malfunctioning, replace the module P/N ST13042-1 using the instructions below. See Figure 5-5. Figure 5-5: Removing the Master Interface Board To Remove the PC Board: 1. Turn off power. 2. Remove plastic cover. 3. Disconnect connectors. 4. Remove panel. Note: Depending on the configuration, there may be one or two master interface boards.
Maintenance Model 6750 5.3.4 D. C. Power Supply The power supply has no field adjustment. If malfunctioning, replace the module (P/N ST15083) using the directions below. See Figure 5-6. Figure 5-6: DC Power Supply Module To replace the module: 1. Turn off power. 2. Remove plastic cover. 3. Disconnect connectors. 4. Remove nuts holding Power Supply. 5. Remove Power Supply Module. 6. Replace Power Supply Module. 7. Reverse steps for installation. 8.
Total Organic Carbon Analyzer Maintenance 5.3.5 CE Computer (P/N 13039) If malfunctioning, replace the Computer Module using the directions below. See Figure 5-7. Figure 5-7: Replacing CE Computer To Replace the CE Computer: 1. Turn off power 2. Disconnect electrical connectors. 3. Remove screws holding Module in place. 4. Remove module. 5. Install new CE Computer in reverse disassembly instruction procedure steps. (Install electrical connectors per supplied drawing). 6.
Maintenance Model 6750 5.3.6 UV Lamp (P/N ST20009) Normal lamp replacement frequency is suggested at least every 12 months, however, if a lamp is “burned-out” (weak or no blue glow), replace with UV Lamp (P/N ST20009), per directions in Figure 8. Figure 5-8: UV Lamp Replacement To replace the UV lamp: 1. Turn off the UV lamp at the UV power supply. Remove persulfate and acid reagent lines from containers, as well as the sample inlet line and submerse all three (3) lines into D. I.
Total Organic Carbon Analyzer CAUTION: Maintenance THE UV LIGHTED LENGTH MUST BE AT LEAST 12 ½ INCHES FOR PROPER OPERATION. DO NOT USE STANDARD 12 INCH LIGHTED LENGTH UV LAMPS. 2. Turn off power allow 10 minutes for cool down. 3. Disconnect electrical connectors. 4. Loosen fittings as illustrated. 5. Remove UV Lamp. 6. Recalibrate analyzer. 5.3.7 UV Reactor Assembly (P/N ST20003-1) If malfunctioning, clean the assembly. If still malfunctioning, replace the assembly (P/N ST20003-1). See Figure 5-9.
Maintenance Model 6750 well as the sample inlet line and submerse all three (3) lines into D. I. water to completely flush system. CAUTION: FAILURE TO DO SO MAY RESULT IN ACID BURNS, CLOGGED REACTOR, ETC. FLUSH FOR 30 MINUTES. 2. Turn off power. 3. Disconnect electrical connectors. 4. Disconnect tubing. 5. Remove thumbnuts holding UV Reactor in—place. 6. Remove UV Lamp (See Figure 5-9). To clean the UV Reactor Assembly: 1. Run warm water through all tubing until clean. 2. Replace assembly as before. 3.
Total Organic Carbon Analyzer Maintenance Figure 5-10: Removing the UV Power Supply 5.3.9 Mass Flow Controller (P/N ST18001A) If proper flow is not detected by the computer, an alarm will be activated and displayed. The fault may be in the O2/Air supply (check for 20 psi and flow of the supply by disconnecting the input). If supply flow exists, fault may be in the tubing. Disconnect output side of mass flow controller and check for flow. If no flow exists, exchange mass flow controller as described below.
Maintenance Model 6750 Figure 5-11: Mass Flow Controller 5.3.10 Metering Valve (P/N ST16050) If no O2/air flow to the sparger (P/N ST20025) is observed (no bubbles), check for tubing and fitting leaks, restrictions and adjust metering valve (be careful to return to previous indicated bubble rate). If flow cannot be restored, replace the metering valve (P/N ST16050) according to the directions below. See Figure 5-12. To replace the metering valve: 1. Turn carrier gas (Air/O2) OFF. 2. Turn pumps OFF. 3.
Total Organic Carbon Analyzer Maintenance Figure 5-12: Metering Valve 5.3.11 Sparger (P/N ST20025) The sparger may be removed for cleaning with detergent and subsequent flushing with DI water. If the sparger inner glass body is observed to be leaking (cracked glass, etc.), or is clogged beyond cleaning, replace sparger (P/N ST20025) according to the directions below. See Figure5-13.
Maintenance Model 6750 1. Turn machine OFF. 2. Turn carrier gas (Air/O2) OFF. 3. Remove and drain tubing and sparger. 4. Remove sparger from spring clips. To clean the sparger: 1. Run warm water through tubing to flush out any solid contamination. 2. Reinstall sparger in reverse order.
Total Organic Carbon Analyzer Maintenance 5.3.12 Pumps If any of the pumps are not pumping (liquid flow is not observed moving up the tubing), check to see if the motor is turning the pump heads and the motor is not binding. Check for proper power and connections to the pump motor. If the motor has failed (e.g., open windings, etc.), replace motor. For 110 V 2 RPM motor , use P/N ST18002; for 220 V 2 RPM motor use P/N ST18003. For pump motor replacement, refer to Section 5.3.12.1 and Figure 5-14.
Maintenance Model 6750 3. Remove pump as illustrated to gain access to pump mounting screws. 4. Remove two thumbscrews for pump panel removal. 5. Disconnect Pump Motor Connector.
Total Organic Carbon Analyzer Maintenance 6. Remove 4 pump mounting screws for pump removal. 7. Replace motor and reassemble in reverse step sequence. Figure 5-14: Removing the Pump Note: Actual mounting panel may appear somewhat different but mounting hardware is the same. 5.3.12.2 PUMP HEAD TUBING REPLACEMENT 1. Separate the end bells (the pump head halves). 2. Hold the end bell containing the rotor as shown with the tubing retainer grooves pointing down.
Maintenance Model 6750 3. Place tubing in the right groove and against the first two rollers. 4. Hold tubing with thumb. 5. Near groove, insert smaller prong of loading key between the top of the rotor and tubing. 6. Push key in as far as possible. 7. Push down and turn key counterclockwise (ccw) completely around the rotor. 8. The key will push the tubing uniformly into the end bell assembly. 9. Hold the second end of tubing. 10. Remove the key.
Total Organic Carbon Analyzer Maintenance 11. Position the other end bell on top and press the end bells together. 12. Be careful not to pinch the tubing. 13. If end bells do not snap tightly together, reload tubing. 14. If necessary, turn key in slot on rotor shaft to adjust tubing (as in next step - E). 15. With key in slot on rotor shaft, turn key to align tang on rotor shaft with slot in motor drive shaft. 16. Point tubing retainer grooves up. 17.
Maintenance Model 6750 5.3.13.1 SETTING 100 MV CONTROL VOLTAGE 1. Using a DC voltmeter, connected to measure DC voltage, connect the black lead to the (-) side of capacitor C1. Located near the lower left corner of the circuit board. Connect the (+) lead to the top of resistor R19, located slightly to the left of the center of the circuit board. Note the mV reading (typically no greater than 3 mV). 2. Next, position the Analog A cursor to Max position. Note the mV reading from the top of R19.
Total Organic Carbon Analyzer Appendix Appendix A.1Specifications Measurement Methods: TC (Total Carbon) – UV/Persulfate Oxidation TOC (Total Organic Carbon) acidification and sparging to eliminate inorganic carbon interference. Temperature: 25o C ± 5o Measurement Ranges: 0-10 through 0-10,000 ppm, full scale (std.) Note: Range changes often require carrier gas adjustments.
Appendix Model 6750 Sample requirements: Inlet Pressure: Atmospheric to 3 psig Flow Rate: 20cc/min. (nom) Drain: Gravity drain vented to atmosphere Suspended Solids: 1,000 microns (max.) Reagents (TOC Mode): Sodium Persulfate: 4.0 gal/month Phosphoric Acid, 10% v/v: 4.0 gal/month (nom.). Calibration: One point span, Chemical standard, computer-stored multiple calibration curves. Facility requirements: Power: 115 + 10% VAC, 50/60 Hz 7A Service Recommended.
Total Organic Carbon Analyzer Appendix A.
Appendix Part # Model 6750 Description ST15083 12V DC Power Supply ST13069-1 Distribution Board ST13070-1 Interface Board ST13039 CE Computer ST100001-6 6” NDIR Assembly Image ST100001-15 15” NDIR Assembly Teledyne Analytical Instruments 72
Total Organic Carbon Analyzer Part # Description ST100006-1 NDIR Detector Assembly ST100009-6 6” NDIR Cell Assembly Appendix Image ST100009-15 15” NDIR Cell Assembly ST100008-1 NDIR Source Assembly ST17007 NDIR O-Ring ST20001 NDIR Sapphire Window ST20025 Sparger Teledyne Analytical Instruments 73
Appendix Part # ST16050 Model 6750 Description Image Metering Value ST200026 IR Calibration Adapter ST20009 UV Process Lamp ST13066-1 AC Board Assembly Teledyne Analytical Instruments 74
Total Organic Carbon Analyzer Part # Description ST200003-1 UV Reactor Assembly ST15000110V UV Power Supply Appendix Image ST15002220V ST18050 Flow Switch ST20024T Gas Liquid Separator Teledyne Analytical Instruments 75
Appendix Model 6750 A.3 Options A.3.1 Option 200008 BENCHMARK (with single point autocal) This option automatically determines analyzer performance to specified limits. It is accomplished by introducing a known chemical standard solution to the analyzer and performing a computation and analysis to verify its operation.
Total Organic Carbon Analyzer Appendix A.3.4 Option 200016 EXTERNAL RANGE CHANGE This option provides for local or remote analyzer range change by contact closure. A.3.5 Option 200017 TRUE DUAL RANGE OPTION (not an electronic scaling) A.3.6 Option 200009 MULTI-STREAM SEQUENCER This option allows time sequencing of analysis of up to Four (4) different streams. A.3.7 Option 400008 DBPR OPTION This option is configured to fully comply with the Disinfection Byproducts Rule as defined by the USEPA.
Appendix Model 6750 Since COD & BOD analysis may vary with seasonal influences or other particular conditions, correlations for those conditions would be used at those times. After obtaining a representative amount of TOC/COD/BOD data, the operator enters those factors into the analyzer computer. Thereafter, all three parameters (TOC,COD,BOD) are continuously displayed. Updates to these correlations may be made at any time. Consult the factory for particular user applications.
Total Organic Carbon Analyzer Appendix A.
Appendix Model 6750 Teledyne Analytical Instruments 80
Total Organic Carbon Analyzer Index Index accuracy, 12, 39 acid, 6, 9, 11, 14, 19 ACID IN port, 30 acid preparation, 38 air, 70 air gap, 29 air purifier, 13 air supply pressure, 29 alarm, 1, 18, 19 concentration, 25, 69 failsafe, 25 high, 25 latching, 25 low, 25 master fault, 1, 25, 69 setpoint, 34 settings, 33 analog output.
Index Model 6750 enclosure, 3 end bell, 65 end-to-end method, 36 EPA, 9 exhaust connection, 27 external pH calibration, 35 fail-safe, 18 features, 1, 17 figures listing, ix flow rate, 13, 29, 70 Form C contact, 25 fuse, 44 gain.
Total Organic Carbon Analyzer parameters menu, 32 parts listing, 71 persulfate, 15, 16, 19 persulfate line, 30 pH, 6, 11, 14 phosphoric acid, 38 POC, 5, 7 potassium hydrogen phthalate, 36 power connection, 23 power requirement, 70 power supply, 23 preferred method of analysis, 6 pressure swing absorption, 13 pump, 11, 63 pump head, 44, 63 pump mounting screw, 65 pump tubing, 66 purgeable organic carbon.
Index Model 6750 UV/Heated Persulfate Oxidation Method, 1, 5. See valve, 19 view window, 3 VOC, 5, 7 volatile hydrocarbon, 11 volatile organic carbon.