Pneumatic system for a gas sensor

Details Pneumatic system for a gas sensor Pneumatic system for a gas sensor

1976-07-16

1977-11-08

Swisher, S. Clement

Measuring and testing

Instrument proving or calibrating

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

G01N 3100

Patent

active

040569675

ABSTRACT:
A pneumatic system for controlling admission of gas samples to a toxic gas monitoring sensor, characterized by including an internally isolated, series pneumatic circuit for continuously circulating purging gas through the sensor, in combination with a gas sampling circuit for introducing gas samples from one or more sources into the relatively isolated series circuit. The gas sampling circuit is further characterized by including a calibration loop having a standard gas leak that is periodically energized to assure the accuracy of readings indicated by the gas sensor in the internal isolated series loop. Also, the gas sampling circuit includes a zero gas source that is selectively operable to feed purifying gas into the gas sampling circuit and thence to the series circuit including the sensor in order to enable flow meters in the system to be calibrated periodically.

REFERENCES:
patent: 3188854 (1965-06-01), Hersch
patent: 3975947 (1976-08-01), Kruishoop

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