Capacitance monitoring bridge circuit for an enthalpy...

Details Capacitance monitoring bridge circuit for an enthalpy... Capacitance monitoring bridge circuit for an enthalpy...

G - Physics

01

W

73/71, 324/29.6

G01W 1/02 (2006.01) G01N 27/22 (2006.01) G01R 27/26 (2006.01)

Patent

CA 1271931

Abstract of the Disclosure An enthalpy control circuit has a humidity responsive capacitive element in one leg of a bridge circuit and a temperature responsive resistance element in another leg. The circuit is powered by a pulsating DC voltage of 1 kilohertz frequency for providing DC output, from an integrator connected to the output of the bridge circuit, indicative of enthalpy. A feedback from an integrator output to the bridge circuit is provided by chopping the DC output into appropriate AC for rebalance. Another feedback circuit around an amplifier provides a reference point compensated for offset voltages brought about by conditions such as temperature affecting circuit components.

502336

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