Oxygen monitoring circuit with built in testing means

Details Oxygen monitoring circuit with built in testing means Oxygen monitoring circuit with built in testing means

1979-02-16

1980-09-23

Swisher, S. Clement

Measuring and testing

Instrument proving or calibrating

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

73 1G, 73 19, 73343R, 204195R, G01N 2728

Patent

active

042235499

ABSTRACT:
An oxygen monitoring circuit is disclosed. The circuit comprises a high impedance follow and hold circuit adapted for connection to an oxygen probe, a readout unit connected to the high impedance follow and hold circuit, a programmer normally connecting the oxygen probe to the high impedance follow and hold circuit but momentarily disconnecting the oxygen probe from the high impedance follow and hold circuit for a relatively short time interval and loading it with a resistor having an impedance relatively higher than the normal impedance of the probe, and a probe failure indicator connected to the outputs of the oxygen probe and of the high impedance follow and hold circuit for detecting any significant change in impedance of the probe and resistor combination as a result of loading and for operating an alarm when the impedance of the probe exceeds a predetermined value.

REFERENCES:
patent: 3957592 (1976-05-01), Young
patent: 3979665 (1976-09-01), Ebling
patent: 4003814 (1977-01-01), Tarassoff et al.
patent: 4094186 (1978-06-01), Wessel

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