TM 10-6665-297-13&P3-2CALIBRATION(continued)3-2.2CalibratingaSystemwithTwoDetectorsperCD800/830ControlUnit. (continued)4.Record meter responses to each detector to aid in evaluating future performances of thedetectors.3-2.3CALIBRATINGASYSTEMFORVOLATILEHYDROCARBONSWITHFLASHPOINTSBELOW70F. The following materials are required to calibrate a detector/module system for response tovolatile liquid vapors:Graduated pipette, 0-1 ml (lcc).One-gallon jug with capPiece of aluminum foilThermometerSample of volatile liquidCalibrate detector/module system for response to volatile liquid vapors as follows. Before exposingdetector to sample mixture, confirm that meter reads zero with detector sampling fresh air. AdjustZERO control R24 of CDS00/830 Systems, or Channel 1 Z1 (R9) and Channel 2 Z2 (R13) ofCD802/832 Systems, if necessary.1.Using pipette, drop 0. 2cc of liquid from which vapors are to be detected in a one-gallon jug.Place aluminum foil on jug to aid in mixing vapor in air.2.Cap jug and agitate until liquid has completely evaporated and vapor has diffused.NOTE:Benzene, toluene, hexane, and xylene may take up to half an hour toevaporate and diffuse.3.Remove cap and place mouth of jug over detector. Invert jug if position of detector permits,since vapors of all flammable liquids are heavier than air.4.Note reading on module indicating meter after 45 seconds. Reading should approximatepercent L. E. L. value for same liquid at temperature of 70°F as listed in Table 3-2. (Heat orcool vaporizing jug to therometer reading 70° for testing. )5.Adjust GAIN potentiometer R10 on control module circuit board to move meter indicator toread on scale at approximate Table 3-2 value.23-96177/1/763-9
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