Two wire current transmitter responsive to a resistive temperatu

Details Two wire current transmitter responsive to a resistive temperatu Two wire current transmitter responsive to a resistive temperatu

1974-09-27

1977-04-12

Queisser, Richard C.

Measuring and testing

Gas analysis

Moisture content or vapor pressure

323 75H, 340210, G01K 724

Patent

active

040167631

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.

REFERENCES:
patent: 3503261 (1970-03-01), Riester et al.
patent: 3517556 (1970-06-01), Barker
Collins, J. A. et al., Pressure Sensor Electronic Converter, In IBM Tech. Disclosure Bull., Vol. 9, No. 3, Aug. 1966, pp. 333-334.

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