Calibration warning device

Details Calibration warning device Calibration warning device

1985-08-23

1987-04-28

Frankfort, Charles

Thermal measuring and testing

Thermal calibration system

73 1R, G01K 1900

Patent

active

046609938

ABSTRACT:
In a calibration warning device for a thermocouple, the thermocouple is connected to input terminals (10) of an operational amplifier (12) provided with negative feedback. The output is applied to the base of a transistor (14) controlling the current supplied to a mercury coulometer (18). When the coulometer indicator reaches full-scale deflection, the thermocouple is due to be recalibrated. The invention utilizes the face that the drift curve of a thermocouple can be matched to a sufficiently high accuracy by a suitable choice of transistor characteristic and amplifier gain, as is explained in the specification.

REFERENCES:
patent: 3738174 (1973-06-01), Waldron
patent: 4120201 (1978-10-01), Wargo
patent: 4132116 (1979-01-01), Zeeb
patent: 4377346 (1983-03-01), Beaver et al.
patent: 4537516 (1985-08-01), Epstein

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