TM 10-6665-297-13&P3-2.3CALIBRATINGASYSTEMFORVOLATILEHYDROCARBONSWITHFLASHPOINTSBELOW700F (continued)NOTE:The % L. E. L. reading for compounds other than those listed in Table 3-2 may be calculatedby using the following formula:Reading =SpecificGravityx12,760Molecular Weight x L. E. L.Example:n-Pentane molecular weight = 72.15specific gravity =.634Reading:634x12,760= 75% L. E.L.72.15 x 1.53-3ADJUSTMENTSWith % L. E. L. meter response properly adjusted for the specific detector element type and kind ofcombustible gas monitored, adjust warning, alarm, test, and recording circuits to operate at the desiredvoltage levels in accordance with the following procedures.3-3.1WARNINGCIRCUITADJUSTMENT. Adjust warning circuit to operate at the voltage level representinga specified % L. E. L. gas-air mixture as follows:NOTE:If FAIL light comes on during adjustment operations, wait 45 seconds after FAIL lightgoes out so that time delay circuit will not interfere with continuing adjustments.1.To impress a warning level triggering signal on the warning circuit, turn ZERO potentiometeradjustment screw (R24 for CD800/830, R9, labeled Z1, for Channel 1 or R13, labeled Z2, forChannel 2 of CD802/832 Systems) slowly clockwise until warning relay K1 energizes andWARN light goes on (circuit card extender circuitry prevents operation of external warningdevices). A two-second time delay occurs before light goes on and relay operates aftertrigger signal begins.2.If WARN light goes on at meter percent L. E. L. reading lower or higher than desired, turnscrew adjustment of ZERO potentio-meter to obtain a meter reading 2 to 3 percent below thedesired point.3.Press RESET button to de-energize warning relay.23-96172/28/803-11
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