Method for sensitizing and stabilizing the operating condition o

Details Method for sensitizing and stabilizing the operating condition o Method for sensitizing and stabilizing the operating condition o

1986-02-06

1987-05-12

Levy, Stewart J.

Measuring and testing

Instrument proving or calibrating

Volume of flow, speed of flow, volume rate of flow, or mass...

73 23, G01N 2712

Patent

active

046639586

ABSTRACT:
When in use for a relatively long time and during the period of operational readiness, semiconductor gas sensors for measuring gas components of a gas mixture exhibit decreasing sensitivity and increased aging, so that if a relatively large quantity of the gas component that is to be measured is encountered they emit either no signal at all or at least an overly feeble signal. A method is disclosed to improve sensitivity and to attain a rapid reaction to the gas that is to be measured. The method is performed by continuously exposing the sensor to a stabilizing concentration having a defined amount of the gas component that is to be measured, particularly during absence of the gas component that is to be measured. A sensor wherein the method of the invention is carried out is also disclosed.

REFERENCES:
patent: 3421362 (1969-01-01), Schaeffer
patent: 3495437 (1970-02-01), Estes, III et al.
patent: 3824836 (1974-07-01), Lyshkow
patent: 3864628 (1975-02-01), Klass et al.
patent: 3960495 (1976-06-01), Tantram
patent: 4112736 (1978-09-01), Wheldon et al.
patent: 4151738 (1979-05-01), Hyer et al.
patent: 4288774 (1981-09-01), Takomi et al.
patent: 4399684 (1983-08-01), Advani et al.
"Thick-Film CO Gas Sensors"; IEEE Transactions on Electron Devices, vol. ED-26, No. 3, pp. 247-249, Mar. 1979; Masayoshi Nitta et al.

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