Capacitance monitoring bridge circuit for an enthalpy responsive

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

1985-03-29

1985-12-17

Frankfort, Charles

Measuring and testing

Gas analysis

Moisture content or vapor pressure

733365, 324 61R, 236 44C, 165 21, G01W 102

Patent

active

045585954

ABSTRACT:
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.

REFERENCES:
patent: 2991653 (1961-07-01), Thompson
patent: 3177427 (1965-04-01), Kuntz et al.
patent: 3221247 (1965-11-01), Samuelian
patent: 3231802 (1966-01-01), Myers
patent: 3280618 (1966-10-01), Ballinger
patent: 3949607 (1976-04-01), Nodolf
patent: 4431962 (1984-02-01), Kompelien
patent: 4449188 (1984-05-01), Unoguchi et al.
patent: 4465229 (1984-08-01), Kompelien

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