TM 10-6665-297-13&PSECTION2INSTALLATIONTo assure optimum gas monitoring efficiency and trouble-free operation, CD800/830 and CD802/832Gas Alarm systems should be installed in accordance with the following procedures and specifications,based on engineering design considerations and experience.2-1LOCATIONOFDETECTORSDetectors should be located at sites where the presence and concentrations of combustible gases mustbe detected with respect to the following conditions (Figures 2-1 and 2-2):1.Aircurrents:Detectors should be located where prevailing air currents contain the fullest possibleconcentrations of escaping gas.2.Relativeweightofgas:Detectors should be located near the floor for heavier-than-air gases orvapors from flammable liquid spills, and near the ceiling or roof to detect lighter-than-air gasessuch as hydrogen and natural gas. Vapors from all liquids are heavier than air.3.Dispersionofgas:Though detectors should not be far removed from any potential source ofescaping gas, liquids of low volatility especially demand location of the detector in the immediatevicinity of the escaping vapor, since a slow rate of dispersion could result in falsely low samplereadings at short distances from the site.4.Heat:Standard diffusion type detectors are designed to operate within a range of from -30° to+200°F, but must be located away from areas outside this range. Special high-temperaturedetectors are available, such as #0050-7005 (for temperatures to 340° F) or High TemperatureProbe #0023-7363 with #0023-7338 element, for temperatures to 600° F. Since diffusion samplingis not feasible for detectors located remotely from the area to be monitored, the #0023-4017remote sample drawing detector assembly is recommended for such applications. Practicalsampling line lengths of 75 to 100 feet are possible, using 1/4" OD tubing.CAUTION:The #0023-4017 detector assembly must not be used to drawflammable liquid vapors having flash points higher than theexpected ambient temperature from atmospheres at elevatedtemperatures. On cooling to ambient temperatures, the vaporsof such samples may condense in the sample tubing beforereaching the reaction chamber. For high flash vapors,Bacharach's special Heated Sample Drawing detectorassembly should be used. Consult factory for suchapplications.23-96177/1/762-1
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