Thermocouple Gages
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Thermocouple gages employ the Pirani gage's physical principle with one difference: the temperature change is sensed by a thermocouple generating an electromotive force proportional to the temperature or to the decrease in the measured pressure. Heating is provided by an alternating current. Another thermocouple incorporated in the sensor's circuit is used to compensate for ambient temperature variation.
Filament (a) and thermistor (b) Pirani gages. Pv = vacuum, 1 = self-heated filament, 2 = self-heated thermistor, 3 = case.
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