Combustible gas detection system

H - Electricity – 04 – B

Patent

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340/79

H04B 3/54 (2006.01) G01N 27/16 (2006.01) G01N 33/00 (2006.01) G08C 19/28 (2006.01)

Patent

CA 1177930

COMBUSTIBLE GAS DETECTION SYSTEM Abstract of the Disclosure A combustible gas detection system in which analog signals produced by a remotely located combustible gas sensor are converted to digital signals at the sensor and the digital signals control a coherent frequency shift keying modulator which impresses alternat- ing signal currents on a transmission line connecting the sensor with a control station. The transmission line is a two wire link of ordinary quality which carries power from the controller to the sensor as well as signals from the sensor to the controller.

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