Measuring and testing – Gas analysis – Gas chromatography
Patent
1982-05-10
1985-02-12
Kreitman, Stephen A.
Measuring and testing
Gas analysis
Gas chromatography
73 27R, G01N 2712
Patent
active
044983301
ABSTRACT:
A gas detecting and monitoring device comprises a bridge circuit including a gas detecting element and a constant-current circuit for feeding a constant current to the gas detecting element. The device further comprises a compensating bridge circuit including at least a part of the gas detecting element. The compensating bridge circuit produces a signal corresponding to the variation of the resistance value of the gas detecting element depending upon the variation of the ambient temperature and feeds the signal to the constant-current circuit to automatically control the current fed to the bridge circuit thereby maintaining the resistance value of the gas detecting element at a constant value. The device may further comprise a correcting circuit including a temperature sensor for sensing the variation of the ambient temperature disposed near the gas detecting element. The correcting circuit feeds the output of the temperature sensor corresponding to the variation of the ambient temperature to the compensating bridge circuit thereby compensating for the variation of the respective circuit components owing to the variation of the ambient temperature.
REFERENCES:
patent: 2759354 (1956-08-01), Cherry et al.
patent: 3429178 (1969-02-01), Durbin
patent: 3634757 (1972-01-01), Monomakhoff
patent: 4164699 (1979-08-01), Timoshenko et al.
patent: 4202666 (1980-05-01), Hall et al.
Kreitman Stephen A.
U.S. Industrial Products Co.
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