Combustible gas detection system

Details Combustible gas detection system Combustible gas detection system

1981-10-27

1983-12-20

Groody, James J.

Communications: electrical

Continuously variable indicating

Using a particular modulation

34087018, 34087029, 340310R, 340632, G08C 1916, G08C 1936

Patent

active

044220731

ABSTRACT:
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 alternating signal currents, through an optically coupled isolator, 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.

REFERENCES:
patent: 3467889 (1969-09-01), Brough-Cunningham et al.
patent: 3793636 (1974-02-01), Clark et al.
patent: 4077030 (1978-02-01), Helava
patent: 4132981 (1979-01-01), White
patent: 4236144 (1980-11-01), Sunagawa
patent: 4328494 (1982-05-01), Goodall
patent: 4350980 (1982-09-01), Ward

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