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IMGHAKJaCH Instruction 23-9613 Rav. No. 1 Saptambar, 1982 INSTRUCTION MANUAL TLV SNIFFER MOD 000017797 UNITED TECHNOLOGIES BACHARACH B--a^--h iratrumem* 301 Alpha DrivePittsburgh, PA 15238 (412) 782-3900 CONTENTS SECTION 1 DESCRIPTION PURPOSE AND FUNCTIONS.................................................................................................... 1-1 . Toxicity Warning Function................................ ....................................1*1 PPM Mattr...................................................................................................................... 1-1 Search Function................................ .... ................................................................... 1-1 Continuous Self-Monitoring. ....................... ......................................... 1-1 PRINCIPLE OP OPERATION................................................................................................1-1 sensitivitt ranges.........................................................................................................1-2 ACCURACY AND RELIABILITY . .......................................................................................1-2 PHYSICAL DESCRIPTION.................................................................................................... 1-3 Instrument and Casa 1--3 Air Ssipling Mechanisms ....................................... .... 1-3 Combustible Gas Detector* ** 1-4 AUXELIA2T EQUIPMENT. . ...............................................................................................1-4 Probe and Hose* . . .................................................................... ...........................1-4 Earphone* ............................................. ............................... ................................ 1-4 Batteries ......................................................................................................................1-4 Battery Charger.........................................................................................................1-5 Recorder* .............................................................................*...........................1-5 CONTROLS............................................................................................................................... 1-5 Mode Selector............................................................................................................ 1-5 ADJUSTMENTS* * ................................................................................................................. 1-5 - Meter Zero Mechanical Adjustment Serov. .................................................. 1-5 Meter Zero Coarse Adjustment Screw*........................................................ 1-6 Mater Zero Pine Adjustment Knob'* ................................ 1-4 Gain Potentiometar Adjustment Screws. *...................*...........................1-4 Alarm Level Potentiometer Adjnstment Screw* . 1-4 Recorder Level Potentiometer Adjustment Screw .....................................1-4 SECTION 2 2-1 PRE-OPERATION CALIBRATIONS AND ADJUSTMENTS BATTERY TEST................................................................................................................. .2-1 SETTING METER POINTER TO ZERO. * *................................ 2-1 SETTING METER POINTER DS7L3CTI0H (GAIN CALIBRATION)........................... 2-2-5 RESETTING ALARM RESPONSE...........................................................................................2-4 SETTING RECORDING LEVEL................................................................................................2-7 SECTION 3 MCI) 000017798 3-1 OPERATION H3NIT0RXNG TOXICITY........................................................................................................ 3-1 Direct Readings and Alarm ............................................................................. - 3-1 Converting Hexane--calibrated Meter ppm Readings to ppm Readings for Other Gases.................................................................................. 3-1 Converting ppm Readings to Percent Lover Explosive Limit* . . . 3-3 LOCATING GAS LEAR SOURCES....................... -................................................................ 3-4 SECTION 1 DESCRIPTION 7TTRP0SE AND FUNCTIONS Toxicity Warning Function The portable B.V Sniffer is an, extremely sensitive combustible gee and vapor easing instrument with an overall detecting sensitivity range of from I. co 10,000 parts of gas or volatile flammable vapor per million parts of air (by volume)* The instrument is equipped vitb an audible (beep) alarm that can be set to sound at any desired level of gas concentration to warn automatically of toxic concentrations of gas* Connections are provided for an auxiliary earphone for use in noisy areas to assure that audible warnings will be heard* PPM Meter A meter, reading directly in parts per million (ppm) allows instant visual determination of toxicity danger aa readings are compared to published - standard Thraahold Limit Values* The instrument can be calibrated to reed directly in parts per million for any one of many kinds of combustible gases* Factory calibration is for hexsne unless otherwise specified, though readings from other gases and vapors may be interpreted eeaily by means of reading coaversion curves (in OPERATION Section, this manual) Ssassk xsassiatt In addition to itx primary function of indicating ppm combustible vapor concentrations and toxicity levels, an ultrasensitive "search1' rsnga of from 1 to 100 ppm makes the TLV Sniffer especially useful for locating hard-tofind 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 sourea of escaping gas* Continuous Self-Monitoring Other functions provided in the TLV Sniffer circuitry for continuous selfmonitoring purposes include a continuous, audible note of warning in rasponae to failing battaries and to excessive negative drift in signal voltage due to malfunctioning detactor circuit components* A 45-second time delay circuit ia incorporated to prevent the sounding of a false alarm due to temporary voltage imbalances during the brief warmup period after the instrument mode selector switch has been set to operate the instrument* ramciras or otoatios M0D 00017799 To detect and measure concentrations of combustible gas in the air, the TLV Sniffer catalytically oxidizes gas in a ptxmped-in sample of air by means of a catalyst-coated resistance element* The resistance of this element changes with changes in heat that are proportional to the amount of oxidized gas, thereby altering the electrical balance of the catalytic element as Calibrated for hexane gas (a relatively high-energy gas) at the factory, the TLV Sniffer should also provi.de accurate ppm readings for benzene, toluene, and other gases of similar combustion rates. Conversion curves aid in correctly interpreting readings from combustible gases that release energy at different rates. Thus, purity of the air sample used for meter pointer zero settings is by far the most important factor in obtaining accurate ppm readings. Ideally, the pointer should be zeroed in the PPM X 1 mode of operation, vhere deviations from zero would be more apparent because of maximum deflection. In this range, however, extreme sensitivity causes the instrument to respond to the slightest traces of gas. Wisps of cigarette smoke, fumes from passing sntos, and subtle air contaminations from many other sources may affect the zero setting. The extent to which zero readings are biased because of air sample impurities will be reflected in less accurate readings of actual gas concentration ppm. Frequently, an apparent negative drift of the meter pointer may be caused by carrying the instrument to an area of fresher air after zeroing the meter inadvertently on air that was not as pure. PHYSICAL PESCRIFTIOH Instrument and Casa The EL7 Sniffer is housed in s sturdy, brushed--aluminum and blue, wrinklefinished plastic ease. An atorectively designed carrying handle serves also as sn adjustable support stsnd and shoulder strep holder. Weighing 5-1/2 lbs^ the compact 8--x6--l/2-x3--1/4--inch instrument is as convenient to carry as s transistor radio. A front panel, easily visible with the instrument in tarrying position, contains a meter reeding directly in ppm, *nd control knob for range selection and zero setting of the indicating meter pointer. The side panels of the instrument provide plugs and connectors for an air sample probe, earphones, battery charger, and recorder. Removal of ten screws holding the rugged plastic cover to the rigid aluminum ease gives access to batteries and calibration adjustment controls located within the interior of the case. TLV Sniffer MOdelq The TLV Sniffer is available as a standard model 00 23-73 50, for use in areas known to be free of combustible gases and vapors, or as an intrinsically safs model 0023-7356, for use in hasardous areas designated Class I, Divisions 1 or 2 by the Rational Electrical Code. Model 00 23-7356 has been certified to be intrinsically safe by the Factory Mutual Laboratories. Air Sampling The B.7 Sniffer air sampling system consists of a short intake connection leading directly into an interior aluminum air chamber holding the detector, a six--inch length of tubing connecting Che chamber and a miniature sample-- drawing pump, and a three--inch length of tubing to an exhaust port on the left side of the instrument case. 00l 7(dq oo For intrinsically safe model: The Intrinsically Safe battery pack is similar to above, but the battery consists of six nickel-cadmium cells connected by voided links to prevent arcing* The cell assembly is enclosed in a rivet-sealed, high-impact, plastic housing vith protective fuses and wire-wound resistors that limit current capacity even under short-circuit conditions to levels belov that vhich vould ignite the vorst possible mixtures of combustible gas and air* Battery Charger A compact battery charger (230 VAC: #0023 -7333; 113 VAC: #0023 -7230) vith e plug-in connector may be attached, to a jack provided in the right side of the instrument case* For stationary testing, the TLV Sniffer may be operated vith the charger connected* For portable operations, the charger may be need to rejuvenate betteriee vithin the instrument overnight* The intrinsically safe battery pack may be recharged either in or outside the instrument* Recorder A recorder (range: 0--100 mv; impedance: 10,000 ohms or greeter) may be connected to the TLV Sniffer for use if variations in combustible gee levels are to be recorded for study or legal data* Recording is more suitable for the PPM Z 100 end PPM Z 10 mode ranges* The ultrasensitive PPM Z 1 "search" range, responsive from 1 eo 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 the signal vithin the range in response to small changes in detscted quantities of combustible gas* CQTOPL$ MCD 00001780! 2ada Salactor The MOSS SELECTOR control knob at lover right on the instrument panel operates a rotating gang svitch vith an 077 position, a battery test switch, and three range-selector svitch positions that allow a choice among three sensitivity ranges for readings of 0 - 100 ppm, 0 - 1000 ppm, or 0 - 10,000 ppm on the meter seals* ADJUSTMENTS Mater Zem Mechanical Ad justment Screw The meter pointer mechanical adjustment screw is located vithin the instrument on the back side of the meter barrel near the - terminal. This adjustment screw is factory set, and does not ordinarily require subsequent attention* Any adjustment of this screw should be done with the MODE SELECTOR knob turned to the 07? position* Alarm Fnggar pons Adjuster (R21) 200 Gain 20 Gain 2 Gain Adjuster (H2) Mods Adjuster Jor intrinsically modal also.) Zaro Coarsa Adjust (H27) Fisa Zaro Adjust (R26) Voltaga Adjuster (B20) Ofteat Adjuster (3.12) -Ci> Oon Figurs TLV Circuitry Adjustment Potentiometer Locations* SECTION 2 PBS-OPERATION CALIBRATIONS AND ADJUSTMENTS Prepare the TL7 Saif far Combustible Gas Detector for operation is accordance with the following scape: BATTER? TS3T Teat baCCar7 ae follows: Tara MODS SZLZCTO& knob fro* 07? position to BAIT T2ST position* Meter pointer should come to rest in BAXTER? GOOD range of aeter scale* (Both a meter reading below BATTER? GOOD range and an audible signal warn of batteries too weak to sustain normal operation*) [ METER POINTER TO ZERO Set pointer to aster tero as follows: MCD 000017803 1* Attach air sampling probe connector to instrument intake on left side of ease by pulling back spring collar of connector* pressing connector over intake* and releasing spring collar* 2* Place TL7 Sniffer in position in which meter indications will be read (usually in meter-up position) NOTE: Heat distribution 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 is pointer zero from one position to the other* 3* Set MODE SELECTOR switch to PPM Z 100 and operate instrument for 10 minutes to allow circuits to stabilize. i 4* In fresh air* set ZERO ADJUST knob at midpoint (five full turns from either extreme position)* If fresh air is not available* use Bacharach Rit #51-7199 to apply known pure air to the Sniffer intake (instructions in kit)* 5* Tarn coarse adjustment screw* located under ZERO ADJUST knob* to move meter pointer to zero on the meter scale* 6* Torn MODS SELECTOR to PPM Z 10 position and turn ZERO ADJUST knob to set pointer to zero* 7* Turn MODS SELECTOR to PPM Z 1 position and turn ZERO ADJUST knob to set pointer to zero* Nvin: The TL7 Sniffer is extremely sensitive in the PPM X 1 range. C02 breath too close to the intake* cigarette smoke* auto fumes, etc** can interfere with accurate setting of the pointer to meter zero* 1 ,2 3; MCI) 0 0 0 0 1 7 8 0 4 Xv*_ Figure 2-2. Calibration Gas Transfer Assembly Properly Hooked Up. o QOSi'tO000 Figure 2-3. Locating, and adjusting 1-13 on PFMX100 position for actor pointer indication of scale zero. 7) Turn HODS 3SLSCT svitch to PFMX10 position. Then, turn the FINS ZERO ADJUST until aeter pointer indicates full scale 1000 ppm. Turn MODE SELECT svitch to PFHX100 position and adjust 14 the X100 Span Adjuster until aeter pointer indicates (10) or 1000 ppm. Turn PINE ZERO ADJUST until meter pointer indicates scale zero. 8) Turn MODE SELECT svitch to PFHZ10 position, then turn FINE ZERO ADJUST until aeter pointer indicates 10 on the scale or 100 ppm. 9) Turn HODS SELECT svitch to PPMXl position and adjust the XI Span Adjuster until aeter pointer indicates 100 (full scale) or 100 ppm. 10) Turn FINE ZERO ADJUST until meter pointer indicates scale zero. The TLV is nov calibrated and ready for use on the lov range 0-100 ppm as a gas leak detector. SBTTOTG RXCORDINC LEVEL If recorder (range: 0-100 nr; impedance: 10,000 ohms or greater) is to be used, attach accessory recorder jack to RECORDER plus la right side of instrument case and set recording level as follows: 1. Set HODS SELECTOR knob to PPM X 100 or PPM X 10 as desired and apply combustible gas to instrument intake* 2m Turn RECORDER potentiometer adjustment screw until accessory recorder response corresponds with meter readings as desired. o0i ?SOe & SECTION 3 OPERATION MONITORING TOXICITT Monitor combustible gas and vapors to determine concentrations with respect to Threshold Limit Values as follows: ffteWt headings jal Alarm 1* Tun MOSS SSLZCT0& control knob to BAIT TEST position and read condition of battery on meter dial* Install new or recharged batteries if necessary* 2* Turn MODS SELECTOR control to desired operating range, selected in accordance with the Threshold Limit Value for the toxic gas to be monitored (PPM Z 1 for TLV from 0 to 100 ppm; PPM Z 10 for TLV from 0 to 1000 ppm; PPM Z 100 for TL7 from 0 to 10,000 ppm)* 3* Allow tan-minute warmup period with instrument in seme position as it is to be used in service (meter facing up or mater facing to the side)* 4* In fresh air before entering monitoring area, turn ZZSO ADJUST control knob until mater pointer resets on zero. 3* Pot monitoring in noisy arena, insert jack of accessory earphone in plug on right side of instrument case* 6* Enter monitoring area and read.ppm gaa 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 alaa has been set for this response* 7* Pot readings .above 10,000 ppm: Replace probe assembly 0023-7243 with dilution probe 0023-7335 and slida dilution probe 0-ring to expose dilution holes of probe (extends range 10Z to read up to 100,000 ppm)* 'See Figure 3-1* Add in-line filter and trap assembly if sampling in dust- or moisture-laden areas* CmwrtiM Gases <^iibrated Meter mb Reedinxs & pp Readings for Other Hexane gaa is commonly used for factory calibration and subsequent inservice recalibrationa of the TLV Sniffer* To determine ppm concentrations of gases other Chen hexane with instruments calibrated for hexane, multiply the ppm meter reading by the factor for the gaa detected as listed in the table below* (Mote meter range setting in making ppm readings and calculations.) Table 3*1* Multiplying Factors for Converting ppm Mater leadings of Hexanecalibrated Instruments to ppm Concentrations of Other Gases. (Approxime tions) Gas Detected Factor Gas Detected Factor Acetone Acetylene Acrylonitrile Benzene 1,3-Butadiene Butane Butyl Acetate Carbon Disulfide Carbon Monoxide Cyclohexane Ethane Ethanol Ethyl Acetate Ethyl Ether Ethylene Ethylene Oxide Heptane Hexane Hydrogen 1.30 1.78 1.34 1.02 1.52 1.04 2.08 3.92 5.11 1.02 1.36 1.90 2.22 1.30 1.38 2.05 1.05 1.00 1.45 Hydrogen Sulfide Isopropanol M.E.E. Methane Methanol Methyl Acrylate Methyl Chloride Methyl Chloroform Pentane Perchiorethy1 ene Propane Propylene Styrene Tetrahydtpfuran Toluene Trichloro ethylene Vinyl Acetate Vinyl Chloride o--Xylene 13.60 1.59 1.60 1.58 3.71 3.37 4.02 4.44 1.04 13.66 1.14 1.30 2.25 1.41 1.03 6.40 2.0Q 2.24 1.64 Converting nm tt.n.Hti.. eo Percent Leal of Lower Brploaiv. limit (ZL.S.l.l To determine gas concentration levels in terms of percent of lover explosive limit (X L.K.L.) from direct ppm readings for hexane or from calculated ppm concentration levels for other gases: i 1* Read ppm on TLV Sniffer indicating meter. - 2. On O-to-10,0001 "PPM CONCENTRATION IN SAMPLE* horizontal scale at bottom of X T-B.L. Conversion Chart, Figure 3*2, locate position left-to*right representing ppm reading. 3. On slanted chart line representing hind of gas detected, find the point in vertical alignment over ppm reading point on horizontal scale. 4 On vertical scale at left labeled X L.2.L. EQUIVALENT," read the percent-of-lover*limit equivalent found in horizontal alignment with the point located on the slanted line. SECTION MAINTENANCE AND REPAIRS SYMPTOMS AND REMEDIES Gradual exhaustion of the detector element, eventual wearing of air-sample pump parts, battery recharging or replacement, etc*, require an amount of maintenance and repair vorfc over an extended period of time* The following table describes symptoms, possible causes, and remedial actions relating to conditions requiring maintenance and repairs. TABT.E 4-1 TROUBLESHOOTING PROCEDURES SYMPTOM Meter pointer drifts from aero. MOD 000017809 - POSSIBLE CAUSE REMEDY Traces of combustible gas in air ssnple thought to be pure. Adjust pointer to zero in fresh air.- Use Bach- arsch Kit 21-7199 if fresh air is otherwise unavailable. Change of position of instrument from upright to horizontal or vice versa, thus redistribu ting heat between active and reference elements of the detector. Keep instrument consistently in either vertical or horizontal position while in use. Insufficient warmup period. Allow 10^inute warmup period before zeroing meter pointer. Erratic monolithic chip. Consult factory or replace circuit board. Erratic sensing element. Replace detector table 4*1 ( cantinued) SYMPTOM Ho audible alarm in presence of strong coneracratioa o combustible gas* POSSIBLE CAUSE hjehedt Oparation of 45-second delay circuit aftar 1CSS ggT.gflTnP control to oparate instrument Wait approximately 45 seconds for delay period to spir* Improper sotting of alarm responaa level* Reset alaxm to desired level* 7aulty monolithic chip* Consult factory or replace circuit board* - 7anlty aiata circuit* Replace printed circuit board* :d ooooi7Qio looit laad to spaakar; daaaged spaakar* Inspect for loose leads* Using 0*157 range voltmeter, check for excitation voltage across speaker terminals while mater indicates in .alarm zone* Dead battarias* Confirm battery exhaustion at mater with MOBE SELECTOR switch in BAIT TEST position* Recharge or replace batteries if necessary* Replacing Batteries Replace batteries, if accessary, aa follows: 1. &oov Can screws used eo hold cower Co case and remove cower* 2m Standard model: Remove two battery aaaaebliee (three batteries in each of two cardboard tubes) from spring clips in back of case. Intrinsically safe model: Replace entire sealed battery pack* The following steps 3 and 4 do not apply* 3* Standard model: Remove old batteries from tubes and replace with new batteries* Orient plus and minus battery terminals as indicated by arrows with polarity signs on battery mounting panel* 4* Standard model: Snap replacement betteries with tubes into battery holding clips* Spring terminals at ona end may be held back with a small screwdriver or similar tool to facilitate insertion of battery aeeemblies in elipe* 3* Replace cower and attach with ten scr fattstti Replace detector when necessary as follows: tin *1 1* Bfrre instrument case cower to gain access eo detector housing* 2* With instrument in speaker~down position, remove four screws used to attach detector socket assembly to cubical aluminum air sample chamber. 3* Life detector socket assembly from air ehotber block. 4* Unplug old detector from socket assembly. 3* Insert new detector in socket. Hew detector part number should correspond to that listed on label affixed to cower of instrument (#800* 080.90). 6* Reinstall sockat assembly with new detector in air chnber and replace instrument cower* Tighten screws uniformly and snugly. Rau lacing Printed Circuit Board Replace printed circuit board, when necessary, as follovs: 1* Roowe instrument case eover to gain access to printed circuit board* 2. Using Allen vTench, remove two small setscrews used to hold HODS* SELECTOR knob to shaft and remove knob from shaft* 3 * Remove hex head nut uied to hold HOBS SELECTOR switch shaft to instment panel* a b ly ia Disassembled P o s itio n * r Intrinsically Safa / H Modal r *8 (A &ht H 9 K fHit* li (A & e SPEAKER 0023-4160 TERMINAL BLOCK 0104-0606 m SPEED NUT I 0002-3666 H* 1.8. (Intrinsically safe) Battery Pack 0023-7364 MINIATURE PUMP ASSEMBLY 0023-4401 Standard Modoli 0 Nl-Cad Colls In Tubas TUBING, 1/4 314-070-00 VIBRATION ISOLATING RECEPTACLE 0023-4461 1/4-TURN FASTENER: RETAINER 0002-BOt STUD 0002-8060 REACTION CIIAM 0023-4635 r hne CHASSIS hd SUBASSEMBLY 0023-4633 d ZT8Z/tOOOO aow BgPTACgMEHT PARTS LIST TIT SHITFSR ^Standard Modal 0023-7350_L Intrinsically Safe Mod.< 0023-73561 ITKM STOCK NO* Calibration Kit Connector, tubing Cora, Instrument * Dry Coll (alternate to Hi-Cad Call; 6 required) Zarphona Elenant, Detector Filter, In-line Dost and Moisture Trap Filter, Probe (box of 24 refills) Fuse (for Intrinsically Safe battery pack) Handle Hexane Tank (500 ppm) ** 1*3. (Intrinsically- Safe) Battery Pack , Knob, Control Knob, Handle * Mi-Cad Call (preferred for standard nodal; 6 required) * Printed Circuit Board Assobly^Std. Modal ** Printed Circuit Board Assembly--Intrinsically Safe Probe and Hose Is>enh1y Probe and Hose Assobly, Dilution Pup Assembly Pump Bellows (replacement) Pump Check Valve (replacement; 2 required) Recorder Plug, Switcheraft #752 Screw, Cower Mounting (10 required) Finishing Hasher (10 required) Spacer, Handle Speaker * Tube, Battery (standard nodal; 2 required) Tubing, 1/4 0*D* x 1/16 vail 0051-7199 0003-6152 0023-4454 3600-3100 0023-06 0 5 3000-8090 0023-7341 3300-7000 0204-2703 0023-4445 0051-1120 0023-7354 0023-4443 0023-4444 0004-0030 0023-4441 0023-4778 0023-7243 0023-7355 0023-4773 0023-0013 0023-4213 01-3461 102--4062 0023-4647 0023-4150 23-2313 03-6105 mcd 00017813 Standard nodal only Intrinsically safe nodal only WAPWAMTW 1. Bacharach Instrument Company Division of AMBAC Industries, Incorporated warrants to Buyar that at the time of delivery this product will be free from defects is material and manufacture and will conform substantially to Bacharach's applicable specifications. Bacharach's liability and Buyer's remedy under this warranty are limited to the repair or replacement* at Bacharach's option* of this Product or parts thereof returned to Seller at the factory of manufacture and shown to Bacharach's reasonable satisfaction to have been defective; provided Chat written notice of the defect shall have been given by Buyer to Bacharach within one (1) year after the date of delivery of this product by Bacharach. 2. Bacharach warrants to Buyer that it will convey good title to this Product. Bacharach's liability and Buyer's remedy under this warranty of title are limited to the removal of any title defects or, at the election of Bacharach* to the replacement of this Product or parts thereof that are defective in title. 3. The warranty set forth in paragraph 1 does not apply to parts the Operating Instructions designate as hawing a limited shelf-life or as being expended in normal use. 4. TBS POREGOIBG WASBAHTIS3 AES EXCLUSIVE ABO AES GIVES ABO ACCEPT2D IB LIEU 07 (1) AST ABO ALL OTBZB WARRANTIES, EXPRESSED OR IMPLIED, XBGLUDISG WITHOUT LIMITATION THE IMPLIED WARRANTIES 07 MERCHAHTABILITT ABO 7ITBSSS 70R A PARTICULAR PURPOSE; ABO (ii) AST OBLIGATION* LIABILITT, RIGHT, CLAIM OR REMEOT IH CONTRACT OR TORT* WHETHER OR HOT ARISIBC PROM BACHARACH'S HEGLXGZNCS, ACTUAL OR IMPLIED. The remedies of the Buyer shall be limited to those provided herein to the exclusion of any and all other remedies including* without limitation* incidental or consequential damages. Ho agreement varying or extending the foregoing warranties, remedies or this limitation will be binding upon Bacharach unless in writing* signed by a duly authorized officer of Bacharach. .BOTH: Puses* batteries, and sensors are expendable itms not covered by. the warranty. MCD 000017814 NOTICE This manual contains propria Cary information that shall not be reproduced or copied in whole or in part as the beeie for manufacture of itmi herein described.