thermocouple vacuum gage

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thermocouple vacuum gage [′thər·mə‚kəp·əl ′vak·yəm ‚gāj]

(engineering)

A vacuum gage that depends for its operation on the thermal conduction of the gas present; pressure is measured as a function of the voltage of a thermocouple whose measuring junction is in thermal contact with a heater that carries a constant current; ordinarily, used over a pressure range of 10^-1to 10^-3millimeter of mercury.

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