Process for interrogation of a detector of the concentration of

Measuring and testing – Gas analysis – Gas chromatography

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340634, G01N 2712

Patent

active

044753780

ABSTRACT:
A two stage process for interrogating a detector of the concentration of combustible gas in an atmosphere. In a first stage, the detector is supplied with a low voltage and the supply is cut and an optional alarm is sounded if a positive signal has been detected. In a second stage, if the signal detected in the first stage is negative or zero, then the detector is supplied with a second, higher voltage. The signal is compared to a predetermined range and, if not within that range, an optional alarm is sounded. A device to apply the process comprising a detector, an amplifier of the signal issued by the detector, a voltage reducing circuit, and a switch that controls the voltage reducing circuit slaved by a discriminator to the sign and/or to the maximum amplitude of the signal output by the amplifier. Application of the process and device to the detection of the concentration of methane.

REFERENCES:
patent: 3678489 (1972-07-01), Scherban
patent: 3932807 (1976-01-01), Wilson
patent: 4020480 (1977-04-01), Gotley
patent: 4028057 (1977-06-01), Nelson
patent: 4031747 (1977-06-01), Blanke
patent: 4237721 (1980-12-01), Dolan
patent: 4344317 (1982-08-01), Hattori
patent: 4352087 (1982-09-01), Wittmaier

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