TM 10-6665-297-13&P3-2.1CalibratingaSystemwithOneDetectorperCD800/832ControlUnitorIndividualDetectorofCD802/832Two-channelControlUnit(continued)5.Using J-W Gas Calibration Kit 0023-7260 or Professional Calibration Kit 51-7070, expose detector tosample gas of known concentration until meter reading stabilizes.If desired, known concentrations of propane gas may be used to calibrate gas detection systems forcorrect response to gases other than propane as follows:a.On conversion chart (Figure 3-2) horizontal scale for "% L. E. L. GAS, " find point representingknown percent L. E. L. concentration of propane gas sample applied. For example: The standard J-W gas cylinder contains 1 percent propane by volume in air, a concentration known to be at 46percent L. E. L.--for which the 46-percent point on the horizontal scale at the bottom of the chartwould be selected.b.Follow up from the selected percent point vertically to diagonal line representing gas for whichcalibration is wanted.c.From point found on diagonal line, follow horizontally to left and read percent L. E. L. meter readingon vertical "% L. E. L. METER READING" scale. To continue the example: Following up from the 46percent pointof the horizontal scale to the diagonal line representing ethylene oxide, and thenfollowing from the point on the diagonal to the vertical scale at left indicates a percent L. E. L. meterreading of approximately 50 percent for ethylene oxide gas calibration.For gases that are not represented on the chart of Figure 3-2, the multiplying (K) factors in Table 3-1may be used to calibrate with propane for gases other than propane. Or the multiplying factors may beused as a preferred alternate method to use of the chart. For example, to use J-W standard propane gascylinder 0023-4009 (1 percent by volume; 46 percent L. E. L.), multiply 46 by the ethylene oxidemultiplying (K) factor of 1.09 as shown in Table 3-1, and get 50 percent as calculated percent L. E. L.reading for ethylene oxide. If using the Professional Calibration Kit 51-7070, multiply kit percent L. E. L.output (determined per instructions with kit) by the multiplying factor for the gas for which calibration isdesired.6.While continuing exposure of detector to sample gas, adjust GAIN potentio-meter (on CD800/830circuit board: R10; on CD802/832 circuit board: R7 for Channel 1 and R18 for Channel 2) so thatmeter reading matches percent L. E. L. concentration of sample gas or percent equivalent foranother gas.Recommendation: For safety factor, adjust GAIN potentiometer to obtain meter reading 10 percenthigher than known concentration of applied sample gas.23-96174/4/783-4
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