Quantcast Figure 1-17. Gas Alarm System

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TM 10-6640-233-10 i Gas Alarm System (Figure 1-17). The gas alarm system consists of a main control unit (cabinet assembly) and two remote detector assemblies. The main control unit is wall-mounted on the roadside and connects electrically to the two detector assemblies. The system operates on 110V, 60Hz, single-phase power. The main control unit supplies 5.5 Vdc to the detectors. The alarm is calibrated for propane and has a setting of 20 to 40 percent of the lower explosive limit (ell)  of  gasoline.  An  indicating  meter  in  the  control  unit  shows  the  concentration  being  monitored  and  adjustable  dual- level alarm circuits are triggered whenever a concentration exceeds the ell. The alarm alerts personnel of combustible mixtures that could cause explosions or fires, and it automatically activates the air purge system. Figure 1-17. Gas Alarm System 1-28


 


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