Regulating circuit for gaseous impurity detector

Details Regulating circuit for gaseous impurity detector Regulating circuit for gaseous impurity detector

1979-11-13

1981-08-04

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

340634, 73 23, 200 6103, 330 9, 328132, 324130, G08B 1710, G01M 304

Patent

active

042825210

ABSTRACT:
A method and apparatus for automatically recalibrating a leak detector. A gaseous impurities is detected by means of a corona discharge. This discharge is sampled and a signal that is a function of the corona discharge level is stored. Subsequent corona discharge levels are compared to the stored signal; and an alarm signal is produced when the subsequent discharge levels exceed the stored value by more than a predetermined amount. To recalibrate the circuit a new signal is stored representative of the corona discharge level at that time. Subsequent corona discharge levels are then compared with the newly stored signal.

REFERENCES:
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patent: 3439261 (1969-04-01), Loh et al.
patent: 3460125 (1969-08-01), Liebermann et al.
patent: 3532980 (1970-10-01), Tucker
patent: 3667041 (1972-05-01), Senour
patent: 3742475 (1973-06-01), Liebermann et al.
patent: 3786675 (1974-01-01), Delatorre et al.
patent: 3801972 (1974-04-01), Ho Kim et al.
patent: 3932850 (1976-01-01), Conforti et al.
J. Millman, "Micro Electronics, Digital and Analog Circuits and Systems", pp. 596-599, (McGraw-Hill 1979).
J. G. Graeme et al., "Operational Amplifiers, Design and _Applications", pp. 350-353(McGraw-Hill 1971).
Stout et al. (Ed.), Handbook of Operational Amplifier Circuit and Design, pp. 25-6 to 25-10 (McGraw-Hill 1976).

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