tankscope-combustibl..
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1. Tankscope Combustible Gas Indicator mode 627 dies WARNING INLET FITTING pee OUTLET FITTING owen HD 7 REAQY BAT gt bo aS READY Xo Vlg J BATTERY STATUS INDICATOR AN NS OE INDICATOR ON 1 OFF QL ON OFF POWER ZERO GAS_ZERO SWITCH CONTROL Figure 2 1 Location of Controls and Indicators 2 1 Chapter 2 Operation 10 e BATT indicator pointer should be at least halfway into the white zone Squeeze the aspirator bulb eight to 10 times to purge the instrument with fresh air NOTE Permit the bulb to completely inflate after each squeeze While squeezing the aspirator bulb lift and adjust the ZERO control to obtain a zero indication on the meter NOTE To make any zero adjustments lift and turn the outer sleeve on the ZERO control Connect the Model R Calibration Check Kit to the calibration check gas cylinder 8 Butane 15 CO2 P N 460345 Connect the adapter hose between the flow control and the instrument inlet fitting Turn the flow control valve counterclockwise to pass the gas through the instrument e When the needle stabilizes the meter should indicate between 7 and 9 Butane Turn the valve clockwise to close Disconnect the hose from the inlet fitting and2. 3 1 Periodic 3 1 Instrument 3 1 Bis CAUTION 3 1 Sampling System Checks 3 1 Leak lt 3 1 Figure 3 1 TC Filament Location 3 2 Figure 3 2 Cotton Filter Replacement 3 3 3 4 Troubleshooting 3 4 Table 3 1 Troubleshooting Guidelines 3 4 Corrective 3 6 TC Filament Replacement 3 6 Flashback Arrester 3 7 WARNING euch ce cept 3 7 Figure 3 3 Location of Parts in Filament Wells 3 8 Figure 3 4 Flashback Arrester Locations 3 9 Battery Replacement 3 10 Figure 3 5 Battery Removal 3 10 Ordering Parts yen Dee Seale dee ep teat esd 3 11 Table 3 2 Parts 3 11 Chapter 4 Calibration s cs teeter en ox 4 1 INthOGUCHON biden Se eee 4 1 Calibration 4 1 Figure 4 1 Span Adjustment Location 4 2 TOC 2 Chapter 1 General Information Chapter 1
3. f a meter reading of 8 cannot be obtained by turning the GAS span adjustment refer to Chapter 3 TC Filament Replacement and repeat this procedure 8 Disconnect the source of Butane 15 CO2 in 9 Squeeze the aspirator bulb eight to 10 times to purge the instrument with fresh air e The meter needle should indicate zero e If it does not indicate zero adjust the GAS ZERO control to obtain a zero reading and repeat steps 7 through 9 10 Place the instrument into the bottom case section and clasp the top and bottom sections together close the cover
4. General Information Introduction This manual provides operation maintenance and calibration information for the Tankscope Model 62T Combustible Gas Indicator General Description The Tankscope Model 62T Indicator is intended for use in shipboard oil transport applications In this application the instrument essentially operates in an inert atmosphere where the inerting gases are diesel exhaust from the ship s power plant For this application a thermal conductivity TC combustible sensor is necessary for appropriate readings General Specifications Table 1 1 General Specifications ELECTRICAL CHARACTERISTICS Factory calibrated to 4 of full scale on 8 Butane in ACCURACY an inert gas of 15 CO2 and 85 N2 8 carbon zinc D cells Eveready 950 Burgess 800 POWER SUPPLY or equivalent POWER SUPPLY 24 hours minimum continuous usage with fresh batteries LIFE at normal ambient temperature RANGE 0 to 25 Butane in inert background gas PHYSICAL CHARACTERISTICS SAMPLE FLOW 0 03 to 0 05 cfm 0 8 to 1 4 LPM RATE CONSTRUCTION Plastic case with stainless steel hardware DIMENSIONS 6 1 2 x 7 1 4 x 4 165 mm x 185 mm x 102 mm WEIGHT 5 Ibs 2 02 2 25 kg 57 g 1 1 Chapter 1 General Information Serial Number Identification The Tankscope Model 62T is identified by a serial number on the inside cover instruction label see Chapter 2 FIGURE 2 1 Include this n
5. seal around both bases does not leak Chapter 3 Maintenance RUBBER BAND 5 BLACK BASE WHITE BASE ZO PIN FLASHBACK ARRESTERS Figure 3 4 Flashback Arrester Locations Seal the inlet fitting with one finger Squeeze the aspirator bulb and immediately seal the bulb outlet with a finger of the other hand bulb inflates check the filament gaskets and re tighten the filaments d Perform the Flow Rate Checks procedure 20 Using the two screws secure the white and orange wire lugs to the white base 21 Mount the battery holder on the posts and secure it with four screws and lock washers 22 Place the bottom section of the case on the instrument so its thumbscrews FIGURE 3 2 are positioned away from the inlet and outlet fittings 3 9 Chapter 3 Maintenance 23 Open the cover and clasp the top and bottom case sections together 24 Perform the Chapter 4 Calibration Procedure Battery Replacement 1 ON Lift the cover and loosen the clasps holding the top and bottom case sections together close the cover Turn the instrument upside down and set it on its cover Lift off the bottom case section Remove the battery retainer FIGURE 3 4 Remove the two nuts FIGURE 3 5 and lift off the contact plate Remove all batteries from the holder and replace them with eight fresh Carbon Zinc D cells Eveready 950 Burgess 800 or equivalen
6. 913 35 foot sampling line complete with couplings 11957 50 foot sampling line complete with couplings 11958 Four foot solid probe tube 11960 Three foot hollow brass probe tube 11961 Four foot plastic probe tube 73743 Thermal conductivity filament white base 74730 Flashback arrester 15264 block assembly includes flashback arrester P N 803761 Batteries Eight Carbon Zinc D Cells Eveready 950 30052 3 11 Chapter 3 Maintenance Table 3 2 Parts List PART PART NO Cotton filters package of six 16499 Line trap for use with MSA sampling lines 74814 Line trap for use with special sampling lines 468428 Aspirator bulb complete with check valves 16839 Calibration Check Kit Model R Flow control 1 5 LPM 459948 Adapter hose 449482 Calibration check gas cylinder 8 Butane by volume in inert 460345 gas 85 Nitrogen 15 Carbon Dioxide Meter 0 25 Butane 711259 Main Circuit Board 711261 Power Supply Circuit Board 711260 Cable 16 pin Ribbon 465468 Potentiometer Assembly 468429 Battery Contact Plate Assembly 465507 O ring Manifold 633918 Tube Aspirator 073839 Flow Orifice 046314 Panel and Cover Assembly 711484 Instruction Manual 711291 3 12 Chapter 4 Calibration Chapter 4 Calibration Introduction e Read this entire chapter before making any Tankscope adjustments e This instrument is normally factory calibrated wi
7. MSA Tankscope Combustible Gas Indicator Model 62T Instruction Manual A WARNING THIS MANUAL MUST BE CAREFULLY READ BY ALL INDIVIDUALS WHO HAVE OR WILL HAVE THE RESPONSIBILITY FOR USING OR SERVICING THE PRODUCT Like any piece of complex equipment the Tankscope Model 62T will perform as designed only if it is used and serviced in accordance with the manufacturer s instructions OTHERWISE IT COULD FAIL TO PERFORM AS DESIGNED AND PERSONS WHO RELY ON THIS PRODUCT FOR THEIR SAFETY COULD SUSTAIN SEVERE PERSONAL INJURY OR DEATH The warranties made by Mine Safety Appliances Company with respect to the product are voided if the product is not used and serviced in accordance with the instructions in this manual Please protect yourself and others by following them We encourage our customers to write or call regarding this equipment prior to use or for any additional information relative to use or repairs CAUTION For safety reasons this equipment must be operated by qualified personnel only Read and understand the instruction manual completely before operating In the U S to contact your nearest stocking location dial toll free 1 800 MSA 2222 To contact MSA International dial 1 412 967 3000 or 1 800 MSA 7777 This manual pertains to instruments with 1000 series and higher Serial Numbers MINE SAFETY APPLIANCES COMPANY 1998 All Rights Reserved Manufactured by MSA INSTRUMENT DIVISION P O Box 427 Pittsburgh Pen
8. SA Instrument Division Service Department 300 Walden Road Cranberry Township PA 16066 10 If flow is corrected perform the Chapter 4 Calibration Procedure A WARNING Do not use the Tankscope 62T Indicator if the flow system has leaks otherwise inaccurate readings may occur which may cause serious personal injury or death Troubleshooting TABLE 3 1 lists the symptoms of the most commonly occurring problems probable cause s and solutions Refer to this table if the Tankscope 62T Indicator e cannot be calibrated by performing the Chapter 4 procedures e does not operate properly Table 3 1 Troubleshooting Guidelines NOTE Perform all troubleshooting in an area free of combustible gases SYMPTOM PROBABLE CAUSE CORRECTIVE ACTION Needle deflects below zero when the ON OFF switch is set to ON Meter cannot be zeroed with the ZERO control READY indicator turns ON Loose connection to the white base TC thermal conductivity filament Tighten screws securing the filament wires to the white base FIGURE 3 1 Filament may be open Perform TC Filament Replacement procedure Needle deflects beyond the upper end of the scale TC filament terminals may be short circuited Remove the short circuit between terminals FIGURE 3 1 Chapter 3 Maintenance Table 3 1 Troubleshooting Guidelines NOTE Perform all troubleshooting in an area free of combustible
9. enance Corrective Maintenance When an inoperative part is located by following the TABLE 3 1 Troubleshooting Guidelines replace it according to one of the following procedures TC Filament Replacement AGURE 3 1 To replace the TC filament perform the following procedure 1 Lift the cover and loosen the clasps holding the case top and bottom sections together close cover 2 Turn the instrument upside down and set it on its cover 3 Turn the instrument so the inlet and outlet fittings are positioned as shown in FIGURE 3 1 4 Remove the four screws and lock washers holding the battery holder to the posts lift off battery holder and place it on its side 5 Remove the two screws holding the lugs on the orange and white wires connected to the TC filament white base 6 Remove the filament with the white base by turning the base counterclockwise until it is free of the well NOTE Be sure to remove only the filament with the white base 7 Insert the replacement filament with a white base into the well 8 Tighten the filament in the well by turning the base clockwise until the gasket is firmly seated against the block 9 Verify that the seal around the base does not leak a Seal the inlet fitting with a finger b Squeeze the aspirator bulb and immediately seal the bulb outlet with a finger of the other hand e f bulb inflates check the filament gasket and re tighten the filament 10 Using the two scr
10. ent well to ensure proper gas flow across the TC filament Leak Checks To check for sampling system leaks 1 Seal the inlet fitting with a finger squeeze the aspirator bulb 2 Immediately seal the aspirator bulb outlet with a finger of the other hand 3 Repeat steps 1 and 2 but do not seal aspirator outlet fitting This will test the outlet valve for leaks e The system is free of leaks if the bulb remains deflated while the inlet fitting and the bulb outlet are sealed e The system is leaking if e the aspirator bulb inflates 3 1 Chapter 3 Maintenance BATTERY HOLDER POSTS POSTS TC FILAMENT WHITE BASE Figure 3 1 TC Filament Location CATAL T NA PLUG filament seal is leaking e the aspirator bulb or valve outlet is leaking e the instrument inlet or outlet fitting gasket is leaking e the tubing is leaking e O seals under the filament manifold leaking or missing e loose mounting screws on filament manifold 4 Ifthe system is leaking a Check the filament seals by opening the case and tightening both bases FIGURE 3 1 b Repeat steps 1 and 2 3 2 Chapter 3 Maintenance If the bulb still inflates check the gaskets then check the aspirator bulb by sealing the inlet fitting with a finger and squeezing the bulb e Replace the bulb if it inflates in less than six seconds Flow Rate Checks A sample should flow through the instrument at 0 03 to 0 05 cubic fe
11. et per hour 0 8 to 1 4 LPM To check for proper flow rate after a leak check 1 2 3 Squeeze the aspirator bulb sealing the aspirator exhaust valve only Observe that bulb inflates completely in two to four seconds If it does not replace the cotton filter a Remove the inlet fitting and gasket b Using tweezers remove the filter FIGURE 3 2 c Replace filter and reassemble Disconnect the aspirator bulb tubing from the outlet fitting Remove the flow regulating orifice FIGURE 2 1 from the fitting to verify that it is open Replace if necessary NOTE If it is clogged insert a 23 gauge 0 0225 in diameter wire through the opening DO NOT USE A DRILL BIT 6 Reassemble completely and reconnect the aspirator bulb INLET FITTING WITH GASKET ASPIRATOR BULB IS DISCONNECTED FROM THE OUTLET FITTING COTTON FILTER ana N o 1 N X X X N POWER ZERO Figure 3 2 Cotton Filter Replacement 3 3 Chapter 3 Maintenance Repeat steps 1 and 2 If the bulb still does not inflate within four seconds perform the procedure given under Flashback Arrester Replacement 9 If the bulb still does not inflate within four seconds return the instrument to MSA M
12. eves A WARNING The flashback arresters must be installed in the instrument to prevent possible flame from the filament wells Do not re use a flashback arrester otherwise it will not fit properly in the sleeve and therefore cannot prevent flame propagation Explosion fire injury or death could occur if both flashback arresters are not installed properly or if they are reused 12 13 Place the absorber and screw in the well tighten the screw Loosen the screw holding the deflector plate disc shaped in the catalytic filament well FIGURE 3 3 remove the deflector and screw 3 7 Chapter 3 Maintenance 3 8 14 15 16 17 18 19 BATTERY HOLDER BLACK BASE WHITE BASE ABSORBER DEFLECTOR PLATE TC FILAMENT WELL Figure 3 3 Location of Parts in Filament Wells Repeat steps 10 and 11 Align the spacer FIGURE 3 4 over the center hole and place the deflector in the well Insert the screw through the hole in the deflector and spacer secure the deflector by tightening the screws Insert the catalytic filament plug with the black base in the well nearest the outlet fitting tighten the filament by turning the base clockwise until the gasket is firmly seated against the block Insert the TC filament with the white base in the remaining well tighten the filament by turning the base clockwise until the gasket is firmly seated against the block Verify that the
13. ews secure the lugs on the orange and white wires to the white base 11 Mount the battery holder on the posts and secure it with four screws and lock washers 12 Perform the Chapter 4 Calibration Procedure 3 6 Chapter 3 Maintenance Flashback Arrester Replacement To replace the flashback arrester in the catalytic and thermal conductivity wells perform the following procedure 1 2 3 10 11 Lift cover and loosen the clasps connecting the top and bottom case sections close the cover Turn the instrument upside down and set it on its cover Lift off the bottom case section Turn the instrument so the inlet and outlet fittings are positioned as shown in FIGURE 3 1 Remove the four screws and lock washers holding the battery holder to the posts lift off battery holder and place it on its side Remove the two screws holding the lugs on the orange and white wires to the white base Remove the TC filament with the white base by turning the base counterclockwise until it is free of the well Remove the catalytic filament plug with the black base by turning the base counterclockwise until it is free of the well Loosen the screw holding the absorber bowl shaped part in the TC filament well FIGURE 3 3 remove absorber and screw Remove the flashback arresters FIGURE 3 4 by grasping the pin with long nose pliers and pulling the arrester out of the sleeve Insert replacement arresters in the sle
14. gases SYMPTOM PROBABLE CAUSE CORRECTIVE ACTION Needle deflects away from zero when the ON OFF switch is set to ON The READY indicator does not turn ON BATT status indicator may be near the red zone Power supply voltage is too low Perform Battery Replacement procedure The READY indicator does not turn ON when the ON OFF switch is set to ON Battery contacts are loose Tighten the nuts on the hex battery posts FIGURE 3 5 Power supply voltage is too low Perform Battery Replacement procedure Circuit malfunction Return instrument to MSA Aspirator bulb must be squeezed more than the directed number of times to obtain a stable meter indication Leak may be present in the sample flow system Check the sample flow system for leaks by performing Flow Rate Checks procedure Cotton filter may be clogged Replace cotton filter Flow regulating orifice may be clogged Open the orifice with 23 gauge wire Flashback arresters may be clogged Perform Flashback Arrester Replacement procedure If the problem cannot be located or corrected by using these guidelines return the instrument to MSA MSA Instrument Division Service Department 300 Walden Road Cranberry Township PA 16066 Refer to Corrective Maintenance for the following replacement procedures e flashback arresters e filaments e batteries 3 5 Chapter 3 Maint
15. ial which absorbs solvent vapors otherwise the absorption will result in erroneous indications usually lower than the actual value Always use the shortest possible length of sampling line to minimize the number of times the aspirator bulb must be squeezed to obtain a valid indication To Test the Atmosphere at a Remote Location 1 Position the male coupling of the sampling line at the desired sampling point so that dirt particles do not clog the tube and liquids are not drawn into the instrument 2 Connect the coupling on the other end of the line to the instrument inlet fitting FIGURE 2 2 NOTE Make sure the connection is gas tight see Chapter 3 Leak Checks e The gas concentration at the sampling point can then be measured by performing the procedure under Chapter 2 Operation Probes Probes permit samples to be taken in areas that cannot be reached with a sampling line By connecting the probe to a 2 4 Chapter 2 Operation INLET FITTING SAMPLING LINE LINE TRAP PROBE Figure 2 2 Sampling Probe Connection sampling line the user can examine barholes manholes and sewers that are obstructed or accessible only through narrow openings FIGURE 2 2 Three probes are available for use with the Tankscope Indicator e four foot solid probe rod used to prevent liquids from entering the instrument if the open end of a sampling line inadvertently dips into a liquid in a tank or o
16. lth and safety regulations Chapter 1 General Information A calibration check should be included as part of a routine inspection of this instrument to ensure it is operating properly and readings are accurate See Chapter 4 for calibration procedure details Use only genuine MSA replacement parts when performing any maintenance procedures described in this manual Substitution of components may seriously impair instrument performance alter intrinsic safety characteristics or void agency approvals Repair or alteration of the Tankscope Indicator beyond the procedures described in this manual could cause the instrument to fail to perform properly FAILURE TO FOLLOW THE ABOVE WARNINGS CAN RESULT IN SERIOUS PERSONAL INJURY OR DEATH Chapter 2 Operation Chapter 2 Operation Initial Inspection Remove instrument from the shipping container if damage or shortage is noted make the proper claim with the carrier Initial Checks FIGURE 2 1 To verify instrument operation and factory calibration perform the following procedure in an atmosphere free of combustible gases If the proper indication cannot be obtained please call our toll free number 1 800 MSA 2222 To contact MSA International please call 1 412 967 3000 or 1 800 MSA 7777 1 Open the cover and set the ON OFF switch to ON e READY indicator should turn ON within approximately four seconds
17. nsylvania 15230 L Rev 0 711291 Table of Contents Table of Contents Chapter 1 General 1 1 INtrOdUCTION 1 1 General Description 1 1 General 1 1 Table 1 1 General Specifications 1 1 Serial Number Identification 1 2 Safety and General 1 2 WARNING 1 2 GENERAL LIMITATIONS AND WARNINGS 1 2 Chapter 2 Operation nannies Re rie pana eee ee EM 2 1 Initial Inspection a 2 ees ca head nee pend pale ee deed ew ae 2 1 Initial CheECkS sorreta teen eee 2 1 Figure 2 1 Location of Controls and Indicators 2 1 MDEFALON Goan 2 2 2 3 Optional Sampling 2 4 Sampling 2 4 2 4 To Test the Atmosphere at a Remote Location 2 4 Probes eeri aes ee la ite ee wed 2 4 WARNING 2 5 Figure 2 2 Sampling Probe Connection 2 5 Trap ere S 2 6 Table of Contents Section 3 Maintenance
18. nt by volume of Butane in an inert background NOTE Meter indications are valid only when the READY indicator is ON When using a sampling line squeeze the aspirator bulb two additional times for each 10 feet of line When using a line trap squeeze the aspirator bulb four additional times 5 After the reading is taken a Remove the probe b Aspirate fresh air through the probe sample line and instrument to flush out residual gas content and avoid confusion in future tests A CAUTION When sampling over liquids ensure that the end of the sampling line does not touch the liquid surface A closed end probe tube or line trap should be used in this type of test to prevent liquid from being drawn into the instrument Sampling dusty or smoky atmospheres may clog the flow system If the instrument response time increases or the aspirator bulb does not inflate within two seconds perform the Chapter 3 Sampling System Checks procedure 2 3 Chapter 2 Operation Optional Sampling Equipment Sampling Lines Sampling lines permit samples to be taken at remote locations or inaccessible areas in order to test the atmosphere in areas such as e manholes e sewers barholes Available sampling lines e range from five to 50 feet e are made of synthetic material specially compounded to resist absorption of combustible vapors A CAUTION Do not use sampling lines made of ordinary rubber or any synthetic mater
19. remove the flow control from the gas cylinder Squeeze the aspirator bulb eight to 10 times to purge the instrument with fresh air If the meter does not indicate between 7 and 9 perform the Chapter 4 Calibration Procedure Operation FIGURE 2 1 To measure the concentration of the specific combustible gas for which the instrument is calibrated perform the following 1 2 2 NOTE Leak flow and calibration checks should be made periodically as described in Chapters 3 and 4 Open the cover and set the ON OFF switch to ON e BATT indicator pointer should be well into the white zone e READY indicator should turn ON within approximately four seconds if it does not turn ON perform the Chapter 3 Battery Replacement procedure Chapter 2 Operation 2 Squeeze the aspirator bulb eight to 10 times to purge the instrument with fresh air NOTE Permit the bulb to completely inflate after each squeeze if the bulb does not inflate within four seconds perform the Chapter 3 Sampling System Checks procedure Lift and adjust ZERO control to obtain a zero indication on meter In the area to be tested squeeze the aspirator bulb seven or eight times to draw the sample into the instrument e For sample line lengths up to 25 feet 10 squeezes are recommended e For sample line lengths between 25 and 50 feet 15 squeezes are recommended e When the needle stabilizes the meter indicates the concentration in perce
20. t NOTE Install the batteries with the positive pole down Replace the contact plate and secure it to the support posts with two nuts CONTACT PLATE A RUBBER BUMPERS 9 3 10 NUTS Figure 3 5 Battery Removal Chapter 3 Maintenance NOTE Firmly tighten the nuts to ensure good electrical contact between the plate and the negative battery poles 8 Place the rubber band around the batteries 9 Place the bottom case section on the instrument so the thumbscrews FIGURE 3 2 are placed away from the inlet and outlet fittings 10 Open the cover clasp the top and bottom case sections together 11 Perform the Chapter 2 Operation Check procedures Ordering Parts To obtain parts service or information send the order inquiry to Mine Safety Appliances Company Portable Instruments Sales Department P O Box 426 Pittsburgh PA 15230 Table 3 2 Parts List Burgess 800 or equivalent PART PART NO Battery Retainer 479581 Five foot sampling line complete with couplings 11354 10 foot sampling line complete with couplings 11955 15 foot sampling line complete with couplings 11912 25 foot sampling line complete with couplings 11
21. th 8 Butane 15 Calibration Procedure e The Tankscope 62T Indicator should be calibrated periodically by performing the following procedure in an atmosphere free of combustible gases e Also perform this procedure if the thermal conductivity filament or any other parts are replaced e If the instrument cannot be calibrated with this procedure refer to Chapter 3 Troubleshooting or return to MSA for service 1 2 3 5 6 7 Open the cover and loosen the clasps connecting the top and bottom case sections Remove the bottom case section and position the instrument on rubber bumpers so the meter can be seen FIGURE 4 1 Set the ON OFF switch to ON e The meter needle should rest near zero e The READY indicator should turn ON if it does not turn ON refer to Chapter 3 TABLE 3 1 Squeeze the aspirator bulb eight to 10 times to purge the instrument with fresh air NOTE Permit the bulb to completely inflate after each squeeze Continue squeezing the aspirator bulb as you lift and adjust the 0 5 ZERO control to obtain a zero indication on the meter Connect a source of 8 Butane 15 in Ne to the inlet fitting Pass the gas through the instrument e The meter needle should rest on 8 4 1 Chapter 4 Calibration GAS SPAN ADJUSTMENT Figure 4 1 Span Adjustment Location e f it does not read 8 turn the GAS span adjustment to obtain 8 on the meter FIGURE 4 1
22. ther vessel see Chapter 3 TABLE 3 2 e three foot hollow brass probe tube three foot dielectric plastic probe tube A WARNING Do not use the brass probe tube where contact may be made with electrical equipment or power lines as a shock hazard exists It is recommended to use the plastic probe tube where possibility of contact with electrical equipment or power lines exists Using the brass probe in these situations may cause serious injury or death Chapter 2 Operation Line Trap The line trap is primarily used to prevent liquids from being inadvertently drawn into the instrument when sampling atmospheres in tanks sewers or sumps NOTE Refer to instructions supplied with the line trap FIGURE 2 2 2 6 Chapter 3 Maintenance Section 3 Maintenance Periodic Maintenance Instrument Cleaning The instrument case and meter face must be cleaned periodically with a soft damp cloth A CAUTION Do not use compressed air to purge the instrument otherwise it may contain entrained oil and or water which may damage internal components Sampling System Checks The Tankscope sampling system must be checked on a regular basis to verify a proper sample flow rate and that no leaks exist NOTE The Tankscope Model 62T Indicator uses only the thermal conductivity TC filament white base to detect Butane The catalytic filament plug black base is not used to detect Butane but must be installed in the filam
23. umber with any correspondence with MSA concerning this unit Safety and General Limitations A WARNING The Tankscope Model 62T Indicator is an instrument of measurement without alarms The operator must understand and monitor the readings to avoid being exposed to an explosive or unsafe atmosphere All calibration and readings must be performed with the Tankscope Model 62T Indicator in the normal upright position If the unit is used in any other position incorrect readings will result Changes or modifications to this unit not expressly approved by the party responsible for compliance could void the user s authority to operate the equipment GENERAL LIMITATIONS AND A WARNINGS The Tankscope Model 62T Indicator measures combustible gases and vapors It cannot measure the presence of combustible airborne mists such as lubricating oils airborne dusts such as grain or coal dust When sampling with accessory sampling lines the shortest possible length should be used to minimize the time needed to obtain a valid reading When sampling over liquids the end of the sampling line must not touch the surface of the liquid Otherwise liquids may enter the instrument causing internal damage In addition sample gas may be blocked from entering the line and a false reading may occur Do not use MSA Lead Inhibitor Filters with this instrument Loss of sensitivity may result Dispose of used batteries in accordance with local hea
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