Thermocouple vacuum gauge

Details Thermocouple vacuum gauge Thermocouple vacuum gauge

1984-10-31

1986-04-01

Woodiel, Donald O.

Measuring and testing

Fluid pressure gauge

Electrical

374164, 374179, G01L 2114

Patent

active

045790027

ABSTRACT:
A thermocouple pressure gauging system for measuring partial vacuum is provided which uses time multiplexing to alternately heat the thermocouple to constant temperature and then measure the EMF from thermocouple with heating current off. A signal proportional to pressure is derived from the heating duty cycle. The pressure signal is in turn used to derive a reference signal which is compared to the EMF from the thermocouple to control the heating of the thermocouple.

REFERENCES:
patent: 3066537 (1962-12-01), Rivera
patent: 3397579 (1968-08-01), Harvey
patent: 3905230 (1975-09-01), Calvet et al.

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