Measuring and testing – Gas content of a liquid or a solid – By vibration
Patent
1993-05-11
1995-04-04
Williams, Hezron E.
Measuring and testing
Gas content of a liquid or a solid
By vibration
73 232, 340632, G08B 1710, G01D 1800, G01N 2700
Patent
active
054026652
ABSTRACT:
Apparatus for monitoring gaseous oxygen concentration that includes an oxygen sensor for providing an electrical sensor signal that varies as a function of oxygen concentration at the sensor. Processor circuitry compares oxygen concentration indicated by the sensor signal to at least one threshold level, and indicates when such oxygen concentration at the sensor departs from such threshold concentration level. The apparatus is calibrated by exposing the sensor to a calibration gas having an oxygen concentration equal to the desired threshold concentration level, and storing in the processor circuitry electrical indicia indicative of operating characteristics of the sensor at such threshold oxygen concentration level. When the apparatus is thereafter employed for monitoring a gas of undetermined oxygen concentration, the operating characteristics of the sensor reflected by the sensor output signal are compared to the prestored indicia for determining when oxygen concentration at the sensor crosses the threshold concentration level.
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"STD Bus Oxygen Analyzer", Litton ILSD, Commercial Products, Pub. No. 10408A (1993).
Cao Tuan Q.
Hart Russell F.
Brock Michael J.
Williams Hezron E.
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