Measuring and testing – Gas analysis – Moisture content or vapor pressure
Patent
1978-08-17
1981-05-05
Swisher, S. Clement
Measuring and testing
Gas analysis
Moisture content or vapor pressure
G01K 724
Patent
active
RE0305979
ABSTRACT:
Circuitry including a resistance sensor is excited by an external power source. A reference voltage is established, the voltage developed across the sensor resistance is compared at an amplifier input with a reference voltage signal and the voltage across a feedback resistor, and the total current drawn through the circuitry adjusts as a function of the sensor resistance to give a balanced amplifier input. Total current may be made a linear function of sensor resistance or a non-linear function by proper selection of certain resistors.
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patent: 3177427 (1965-04-01), Kuntz et al.
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patent: 3302106 (1967-01-01), Shaw
patent: 3322971 (1967-05-01), Liu
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patent: 3483476 (1969-12-01), Kobayashi
patent: 3503261 (1970-03-01), Riester
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Oswald, R. K. Thermistor Temperature to Current Transducer, IBM Technical Disclosure Bulletin, vol. 7, No. 12, May 1965, pp. 1124-1126.
Collins, J. A. et al. Pressure Sensor Electronic Converter, IBM Technical Disclosure Bulletin, vol. 9, No. 3, Aug. 1966, pp. 333-334.
Rosemount Inc.
Swisher S. Clement
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