Dry well for temperature calibration system

Details Dry well for temperature calibration system Dry well for temperature calibration system

1977-02-04

1978-03-21

Swisher, S. Clement

Measuring and testing

Instrument proving or calibrating

Volume of flow, speed of flow, volume rate of flow, or mass...

62 3, G01K 1500

Patent

active

040796183

ABSTRACT:
A system for calibration of a temperature probe at temperatures both above and below ambient. A dry type heatsink for receiving the temperature probe, with a plurality of thermo-electric modules for selectively heating and cooling the heatsink to a preset temperature. A control circuit with a bridge arm for the desired or set temperature and a bridge arm for the actual or sensed temperature, providing inputs to a comparator for determining deviation from the set temperature and energizing the modules to change the temperature at the heatsink. A display unit for selectively displaying the actual temperature and the set temperature and for use in calibrating the system. A constant current source for the sensing arm of the bridge for improving the accuracy of the sensed temperature.

REFERENCES:
patent: 3309881 (1967-03-01), Beerman
patent: 3402561 (1968-09-01), Mahoney
patent: 3480015 (1969-11-01), Gonzalez
patent: 3499294 (1970-03-01), Barton et al.

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