Constant power dissipation in capacitance pressure transducers

Details Constant power dissipation in capacitance pressure transducers Constant power dissipation in capacitance pressure transducers

2007-08-09

2008-11-18

Allen, Andre J (Department: 2855)

Measuring and testing

Fluid pressure gauge

Diaphragm

C073S724000, C361S283100, C361S015000

Reexamination Certificate

active

07451654

ABSTRACT:
A system and method are described for maintaining power dissipation substantially constant across the sensor interface board of a capacitance pressure transducer. A shorted diaphragm level detector detects a shorting of the diaphragm onto one or more reference electrodes. A power dissipating resistor is placed near the oscillator that drives the capacitance detecting circuit in the capacitance pressure transducer. The resistor is switched across a power supply when the shorting is detected, causing current to flow through the resistor so that power can be added in an amount sufficient to maintain power dissipation by the oscillator substantially constant when the diaphragm shorts.

REFERENCES:
patent: 6252759 (2001-06-01), Lange et al.
patent: WO9845675 (1998-10-01), None
patent: WO9940405 (1999-08-01), None
International Search Report for corresponding PCT Application No. PCT/US2007/017708, 3pp.
Written Opinion for corresponding PCT Application No. PCT/US2007/017708, 6pp.

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