Differential twin sensor system

Details Differential twin sensor system Differential twin sensor system

1995-07-27

1997-11-11

Dombroske, George M.

Measuring and testing

Liquid level or depth gauge

Thermal type

7320411, G01F 2300, G01F 168

Patent

active

056851944

ABSTRACT:
Differential outputs produced by twin thermoresistive sensors are used to determine the level and flow of a medium. Separate constant current sources supply power to each sensor so that one constant current source supplies sufficient current to cause significant self-heating of the sensor (hot sensor) and the other constant current source supplies relatively little current with insignificant self-heating of its corresponding sensor (cold sensor). Resistive changes in the sensors produced by level and flow changes of the medium produce measurable voltage changes, thereby providing a convenient parameter by which to determine level or flow. Level or flow is determined by dividing the difference in the voltages across the hot and cold sensors by the voltage across the cold sensor.

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