Gas detector

G - Physics – 08 – B

Patent

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340/147

G08B 21/00 (2006.01)

Patent

CA 1194583

GAS DETECTOR ABSTRACT OF THE DISCLOSURE A pellistor type combustible gas detector including a Wheatstone bridge therefor fed from a voltage regulator and a constant current generator. Two comparators detect, for example, 50% to 75% of the lower explosive limit of the gas to be detected and 25% thereof, respectively. Latches keep indicator lamps lit and alarms turned on. The latches are selectively inhibited or not to check front panel and remote milliammeters calibrated in percent of gas concentration, and to test alarms. A gauged switch performs these and operating and reset functions. A circuit failure detector, lamp and alarm are also provided.

422618

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