TM 10-6665-297-13&P3-2.2CalibratingaSystemwithTwoDetectorsperCD800/830ControlUnit(continued)If using J-W Calibration Kit(s) 0023-7260: 2 Gas Calibration Cylinders: Either 100% Nitrogen (0023-4003) or Zero Gas/Dry-air (0023-4004) if combustible-gas-free air does not exist at both detectors(one or none required if one or both detectors are in fresh air. If Professional Calibration Kit(s) (51-7070) is used, kit supplies clean, filtered air for zero calibrations.If using J-W Calibration Kit 0023-7260: Gas Calibration Cylinder containing sample gas similar to thatexpected at detector locations. If using Professional Calibration Kit 51-7070: Kit supplies sample gasat known percent L. E. L. concentration.0-10 Volt range D. C. voltmeter with ± 2% accuracy in 5-6 Volt range.Test Socket Adapter 0023-4027Circuit Card Extender 0023-4023 (except for CD800P models with built-in extension feature)Calibrate CD800/830 paired-detector alarm system for zero meter indication in gas-free air as follows:1.Read supply voltages at both detectors (using test socket adapter and voltmeter in accordance withinstructions in Section 2-6.7.2.If supply voltages are not within 0. 15 VDC at both detectors, find and correct faulty circuitconditions (poor connections, leakage, open or short circuits, unbalanced resistances in supply linesdue to wrong choice of wire gauges for length of run). Remove test socket adapter(s) and reinstallsensor elements in detector socket(s).3.Using portable combustible gas indicator, test surrounding air at both detectors. If combustible gasesare present at one or both detectors, use J-W gas calibration kit(s), sample cup(s), and 100%oNitrogen or Zero-gas/Dry-air cylinder(s), or Profession Calibration Kit(s) 51-7070 to supplycombustible, gas-free air (paragraph 3-1.1, Figure 3-1, and Professional Calibration Kit instructions51-9001).NOTE: Both detectors must be sampling zero combustible gas before adjustment of indicatingmeter circuitry for zero meter setting.4.For access to control unit screw adjustments in many rack and cabinet installations, remove circuitboard, plug circuit card extender #0023-4023 into connector strip at rear, and plug circuit board intocard extender. Use of the card extender during circuit adjustments prevents remote alarms fromoperating.23-96174/6/773-7
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