Method for monitoring operation of a current-limiting type gas s

Details Method for monitoring operation of a current-limiting type gas s Method for monitoring operation of a current-limiting type gas s

1982-03-12

1985-07-30

Tung, T.

Chemistry: electrical and wave energy

Processes and products

204401, 204402, 204425, 204429, G01N 2746

Patent

active

045320136

ABSTRACT:
To permit calibrating and testing a current-limiting sensor in situ, the sensor is exposed, from time to time, to ambient air forming a standard gas, and the output thereof compared with a standard, for example by connecting a resistor (4) of standard value in circuit therewith or for recalling from a memory (23) in a microcomputer (22) standard conditions; upon determination of a deviation between output from the sensor (2) when exposed to the standard gas--typically air--and the theoretical value as stored, the theoretical or reference value is reset if the deviation is within a predetermined limit or, otherwise, an alarm output is provided. The tolerance limits can be set in such a way that a first alarm output is provided in a narrow tolerance, thus indicating drift of the sensor toward eventual malfunction, and permitting utilization of the sensor for long lifetime, while providing advance warning of imminent failure. Change of applied voltage to the sensor and test for current therethrough can then derive an actual operating curve which can be compared with stored test curves in the memory from which, upon extrapolation, a tendency to failure can be predicted and recognized.

REFERENCES:
patent: 2955206 (1960-10-01), Spergel et al.
patent: 3429784 (1969-02-01), Molloy
patent: 3691023 (1972-09-01), Ruka et al.
patent: 3740533 (1973-06-01), Van Zeggelaar
patent: 4231733 (1980-11-01), Hickam et al.
patent: 4306957 (1981-12-01), Ishitani et al.
patent: 4356065 (1982-10-01), Dietz
patent: 4384925 (1983-05-01), Stetter et al.

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