TM 10-6665-297-13&PSECTION3CALIBRATIONANDADJUSTMENTS3-1GENERALOBJECTIVESIn general, CD800/830 and CD802/832 calibration consists of setting ZERO and GAIN adjustments onthe control module so that 0 to 100% L. E. L. gas-air mixtures at the detector drive the control modulemeter indicator between 0 to 100% readings. Because each specific combustible gas releases energyupon oxidation at a different rate than another, different gases require different calibrations. Aftercalibration has been completed, control module WARN and ALARM potentiometers may be adjusted toswitch warning and alarm relays in response to designated % L. E. L. gas-air mixture levels at thedetector. Then a RANGE potentiometer is set to drive the meter indicator full-scale when the TESTpushbutton is depressed, and a RECORD potentiometer may be adjusted to operate a recorder atdesired voltage levels.3-2CALIBRATIONCalibration procedures are required for three different alarm system applications:1.Individual detectors (CD800/830 or CD802/832).2.Detectors paired with one CD800/830 control unit.3.One or two detectors per control unit sampling volatile hydrocarbons with flash points below 700 F.Select and follow the procedure appropriate to the existing system.NOTE:New installations and operating installations with new detectors should be rezeroed with nocombustible gas at detectors after 24 hours of operation and again after 1 week of operation.3-2.1CALIBRATINGASYSTEMWITHONEDETECTORPERCD800/830CONTROLUNITORINDIVIDUALDETECTOROFCD802/832TWO-CHANNELCONTROLUNIT. Two people and thefollowing special tools are required to calibrate the gas alarm system:Portable Combustible Gas Indicator23-96174/6/773-1
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