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Содержание TLV sniffer

Страница 1: ...r byqualifiedpersonnel An instrumentthatisnotproperly calibrated operatedandmaintainedbyqualifiedpersonnelislikelytoprovide erroneousinformation whichcouldpreventuser awareness ofapotentiallyhazardoussituationfortheinstrumentuser other personnel and property If after reading the informationin this manual the user has questions regarding the operation applicationormaintenance oftheinstrument superv...

Страница 2: ...n title The warranty set forth in paragraph 1 does not apply to parts the Operating Instructions designate as having a limited shelf life or as being expended in normal use THE FOREGOING WARRANTIES ARE EXCLUSIVEANDARE GIVEN AND ACCEPTED IN LIEU OF i ANY ANDALL OTHERWARRANTIES EXPRESSOR IMPLIED INCLUDING WITHOUTLIMITATION THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULARPURPOSE...

Страница 3: ...ered as approximate only This is true because of several variable factors which can affect the probe operation such as 1 The actual dilution ratio is dependent upon the flow rate of the sample The flow rate is affected by battery charge speed of the pump cleanliness of the probe condition of the probe filter etc 2 The actual dilution ratio is dependent upon the quality of the air which provides th...

Страница 4: ...s by a factor of 10 when using the probe in the dilution mode 0 All meter readings in the dilution mode should be considered as approximate only 0 Don t forget to re cover the dilution holes with the movable O ring to obtain undiluted gas samples Bacharach Inc 625 Alpha Drive Pittsburgh PA 15238 412 963 2000 ...

Страница 5: ...week or two once a month at least 4 Match charge time to use on about a two to one ratio e g if you use the NiCads for four hours charge them for about eight hours DON T 1 Do not use new NiCads without putting them through a full charge 2 Do not attempt to use NiCads or leave the instrument 0N when the cells are fully discharged To obtain proper instrument operation and to prevent NiCad damage the...

Страница 6: ...he internal ionic structure of one of the NiCad cells reverses polarity Consequently do not continue to use an instrument with NiCads when the battery monitoring system indicates low or depleted batteries The instrument should be turned off and recharged before being used again 2 If NiCads are overcharged they can be destroyed NiCads work by means of an internal chemical electrical process involvi...

Страница 7: ...han normal and then to recharge them in order to defeat the memorized ionic structure Sometimes this cycle depletion recharge will have to be repeated two or three times before the memory can be overcome The best way to insure against memory is to fully cycle the NiCads periodi cally That is once every week or two leave the instrument on until the battery indication shows a low reading or a rechar...

Страница 8: ... Mechanical Adjustment Screw l 5 Meter Zero Coarse Adjustment Screw l 6 Meter Zero Fine Adjustment Knob l 6 Gain Potentiometer Adjustment Screws l 6 Alarm Level Potentiometer Adjustment Screw l 6 Recorder Level Potentiometer Adjustment Screw 1 6 SECTION2 2 l PRE OPERATIONCALIBRATIONSAND ADJUSTMENTS BATTERYTEST 2 l SETTING METERPOINTER TO ZERO 2 1 SETTING METER POINTER DEFLECTION GAIN CALIBRATION 2...

Страница 9: ...ach Code 51 7199 Gas Calibration Kit 2 3 Calibration Gas Transfer Assembly 2 3 Locating and adjusting R 13 on PPM X 100 Position 2 5 Locating and adjusting R 3 for Certified Gas Indication 2 6 Use of Dilution Probe and Hose Assembly and I In line Filter and Trap Assembly 3 2 Conversion Curves Showing Relationship of PPM Concentrations of Various Gases to Percent L E L Equivalents a 3 4 TLV Sniffer...

Страница 10: ...ion In addition to its primary function of indicating ppm combustible vapor concentrations and toxicity levels an ultrasensitive search range of from 1 to 100 ppm makes the TLV Sniffer especially useful for locating hard to find gas leaks A hand held probe attached to the instrument can be moved in the direction indicated by rising meter readings to point out quickly the source of escaping gas Con...

Страница 11: ...ppm Each range setting requires an easily made adjustment of the ZERO ADJUST control knob on the instrument front panel to set the meter indicating pointer to zero Span adjustments for full scale pointer deflection within each range are made periodically as necessary by means of three gain potentiometers located within the instrument ACCURACY AND RELIABILITY The extent to which meter readings corr...

Страница 12: ...wrinkle finished plastic case An attractively designed carrying handle serves also as an adjustable support stand and shoulder strap holder Weighing 5 l 2 lbs the compact 8 x6 l 2 x3 l 4 inch instrument is as convenient to carry as a transistor radio A front panel easily visible with the instrument in carrying position contains a meter reading directly in ppm and control knob for range selection a...

Страница 13: ...obe protects the sample drawing lines and chamber from intrusion of dust and dirt The dilution probe 0023 7355 has an O ring covering holes designed to admit air to dilute the sample 10 times With O ring moved to expose dilution holes the instrument reads up to 100 000 ppm to accommodate sample concentrations above the normal 10 000 ppm limit See Figure 3 l An in line filter and trap assembly 23 7...

Страница 14: ...connected to the TLV Sniffer for use if variations in combustible gas levels are to be recorded for study or legal data Recording is more suitable for the PPM X 100 and PPM X 10 mode ranges The ultrasensitive PPM X 1 search range responsive from 1 to 100 ppm of gas is not as suitable for an accessory recorder because of the small magnitude of the signal and the potentially rapid fluctuations of th...

Страница 15: ...bility the replacement of an exhausted detector element is indicated Gain Potentiometer Adiustment Screws Figure l 1 Three gain potentiometer adjustment screws accessible with the instrument cover removed are located on the circuit board at lower right within the instrument case With sample calibration gas of known concentration applied to the air sample intake of the instrument these screws are t...

Страница 16: ...r x2 w 1 NOTE Standard model fflustra ted Adjuster locations typical for intrinsically safe f Fine Zero Adjust R26 i model also Voltage Adjuster R20 Offset Adjuster RP3 Figure l l TLV Circuitry Adjustment Potentiometer Locations ...

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Страница 18: ...n from active and reference filaments of the detector sensor changes from vertical to horizontal position The resulting change in electrical balance between elements causes a shift in pointer zero from one position to the other Set MODE SELECTOR switch to PPM X 100 and operate instrument for 10 minutes to allow circuits to stabilize In fresh air set ZERO ADJUST knob at midpoint five full turns fro...

Страница 19: ...t 51 7131 Shown Flowmeter Mtg Bracket Flowmeter Quick Connect Ftg Regulator Tee 3 16 plastic Rubber Tubing Barbed Hose Ftg connected to Regulator Assembly ordered separately Cylinder Hexane Air mixture certified 500 PPM Zero Calibration Gas Compressed Air 1 1 1 1 1 5 ft 1 1 1 Refer to Figure 2 2 and connect the gas transfer assembly as shown making certain all connections are air tight Use the ret...

Страница 20: ... Figure Z l Bacharach Code 51 7199 Gas Calibration Kit Figure 2 2 Calibration Gas Transfer Assembly Properly Hooked Up 2 3 ...

Страница 21: ...ange 3 Turn MODE SELECTOR TO BATT TEST position The meter pointer must indicate within BATTERYGOODrange if not recharge Refer to Figure 2 4 locating TP 3 and connect a Voltmeter between TP 3 I and ground 1 check for 6VDC If not refer to Figure 2 3 locating R 20 and adjust for 6VDC 2 Ol VDC 4 After allowing for five minute warm up turn MODE SELECTORswitch to PPMXlOO position and adjust R 13 see Fig...

Страница 22: ...uster until meter pointer indicates 10 or 1000 ppm Turn FINE ZERO ADJUST until meter pointer indicates scale zero Turn MODE SELECT switch to PPMXlO position then turn FINE ZERO ADJUST until meter pointer indicates 10 on the scale or 100 ppm Turn MODE SELECT switch to PPMXl position and adjust the Xl Span Adjuster until meter pointer indicates 100 full scale or 100 ppm Turn FINE ZERO ADJUST until m...

Страница 23: ... midpoint of the meter scale is not suitable reset alarm response level as follows 1 Turn meter zero coarse adjustment screw located under ZERO ADJUST control knob at lower left on instrument panel to set meter pointer to desired alarm point on meter scale 2 Turn ALARM potentiometer adjustment screw until audible alarm sounds 3 Turn meter zero coarse adjustment screw to return pointer to zero on m...

Страница 24: ...rder jack to RECORDERplug in right side of instrument case and set recording level as follows 1 Set MODE SELECTOR knob to PPM X 100 or PPM X 10 as desired and apply combustible gas to instrument intake 2 Turn RECORDER potentiometer adjustment screw until accessory recorder response corresponds with meter readings as desired ...

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Страница 26: ... of accessory earphone on right side of instrument case in plug Enter monitoring area and read ppm gas concentrations on meter Audible warning sounds if gas concentration causes readings at mid point of scale or above or if toxic Threshold Limit Value has been exceeded provided the alarm has been set for this response control For readings above 10 000 ppm Replace probe assembly 0023 7243 with dilu...

Страница 27: ...ide of sniffer TLV SNIFFER 23 7350 or 23 7356 To install probe II and hose a spring loaded r and press fitting over filter connector Use in dust or moisture laden atmospheres Movable O ring shown in air dilution position Slide O ring to cover dilution holes to obtain undiluted samples DILUTION PROB 23 ...

Страница 28: ...e 1 30 Styrene 2 25 Tetrahydrofuran 1 41 Toluene 1 03 Trichloroethylene 6 40 Vinyl Acetate 2 00 Vinyl Chloride 2 24 o Xylene 1 64 Convertinqppm Readings to Percent Level of Lower Exnlosive Limit XL E L 1 To determine gas concentration levels in terms of percent of lower explosive limit L E L from direct ppm readings for hexane or from calculated ppm concentration levels for other gases 1 Read ppm ...

Страница 29: ...ons of Various Gases to Percent L E L Approximate Equivalents LOCATING GAS LEAX SOURCES To utilize the TLV Sniffer in searching for gas leaks hoses containers etc 1 Set MODESELECTORcontrol knob to PPM X 1 position in tanks pipes 2 Search for exact location of leak with probe Meter reading will increase as leak is approached and decrease as probe moves away from leak ...

Страница 30: ...ESHOOTING PROCEDURES Meter pointer drifts Traces of combustible Adjust pointer to zero from zero gas in air sample in fresh air Use Bach thought to be pure arach Kit 51 7199 if fresh air is otherwise unavailable Change of position of Keep instrument instrument from upright consistently in either to horizontal or vice vertical or horizontal versa thus redistribu position while in use ting heat betw...

Страница 31: ...nsistent with appro priate Threshold Limit Value Faulty monolithic chip Consult factory or re place printed circuit board Faulty detector or Replace detector make 1 detector lead lead connections clean connections and tight Continuous tone Run down battery audible signal meter Recharge or replace batteries pointer to left of BATTERYGOODzone of meter with control set to BATT TEST Negative downscale...

Страница 32: ...tting of Reset alarm to desired alarm response level level Faulty monolithic chip Consult factory or replace circuit board Faulty alarm circuit Replace printed circuit board Loose lead to speaker Inspect for loose leads damaged speaker Using 0 15V range voltmeter check for excitation voltage across speaker terminals while meter indicates in alarm zone Dead batteries Confirm battery exhaustion at m...

Страница 33: ...sponse with that of a known good instrument Inadequate sample flow Check for air leak in sample hose probe or external connections Plugging probe inlet will stall pump if no leak exists Examine pump piston and diaphragm Repair or replace faulty components and parts If in only one range Check potentiometer faulty calibration resistance with ohmmeter Replace if necessary Faulty sensing element Repla...

Страница 34: ...h ten screws Replacing Detector Replace detector when necessary as follows a 2 3 4 5 6 Remove instrument case cover to gain access to detector housing With instrument in speaker down position remove four screws used to attach detector socket assembly to cubical aluminum air sample chamber Lift detector socket assembly from air chamber block Unplug old detector from socket assembly Insert new detec...

Страница 35: ...o free recorder and earphone plugs and MODE SELECTOR shaft from case Remove circuit board from case 9 Install new circuit board part 23 4441 Replacing Sample Pump Replace air sample pump when necessary as follows 1 Remove cover of instrument case to gain access to air sample pump 2 Turn fastener stud 0002 8059 l 4 turn to release miniature pump assembly from chassis panel 3 Disconnect pumpmotor le...

Страница 36: ...I S intrhsically safe Battery MINIATURE PUMP ASSEMBLY 0023 4491 TUBING l Standard Model 6 Ni Cad 3 14 070 SPEAKER Cells in Tubes 0023 4150 04 0696 0002 3885 CHASSIS SUBASSEMBLY 0023 4633 ...

Страница 37: ... Std Model Printed Circuit Board Assembly Intrinsically Safe Probe and Hose Assembly Probe and Hose Assembly Dilution PumpAssembly Pump Bellows replacement Pump Check Valve replacement 2 required Recorder Plug Switchcraft 755 Screw Cover Mounting 10 required Finishing Washer 10 required Spacer Handle Speaker Tube Battery standard model 2 required Tubing l 4 O D x l 16 wall Standard model only Intr...

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