Electronic thermometer with redundant measuring circuits and err

Details Electronic thermometer with redundant measuring circuits and err Electronic thermometer with redundant measuring circuits and err

1992-01-10

1994-02-01

Cuchlinski, Jr., William A.

Thermal measuring and testing

Temperature measurement

By electrical or magnetic heat sensor

374183, 340515, 340584, G01K 724

Patent

active

052826856

ABSTRACT:
An electronic thermometer for use in food and dairy processing is disclosed. The thermometer utilizes a passive trimming circuit in conjunction with high quality Resistive Temperature Devices (RTDs), along with four-wire measurement circuitry to create an extremely accurate signal so that all probes are interchangeable and require no adjustment to maintain accuracy. The current source is modulated to linearize the RTDs response over a broad temperature range. To substantially eliminate the possibility of false temperature readings, dual RTDs and redundant electronic circuitry are employed, along with a detection circuit which will blank out the display should an error be detected. To prevent undue display blanking, a rapid temperature change sensing circuit will temporarily override the display blanking feature.

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patent: 5116136 (1992-05-01), Newman et al.
patent: 5172099 (1992-12-01), Glaser

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