Vacuum measurement is an important part in vacuum technology. Instruments used to measure vacuum degree is called vacuum gauge. Vacuum heat treatment furnace and vacuum furnace commonly used vacuum gauge are: thermocouple gage ionization gauge, etc. They work as follows: (1) thermocouple gage
Thermocouple gage consists of sensor, thermocouple gauge and measuring instruments. The thermocouple gauge and vacuum system under test are interlinked, enclosure for the glass tube, the tube with heating wire
And thermocouple wire. The cold end of thermocouple wire and hot end temperature is not at the same time, due to temperature difference effect, thermoelectric potential in loop. Such as heating wire voltage constant, the thermocouple wire
The potential action in the temperature of the heating wire, and the temperature of the heating wire is associated with the pressure of the gas being measured. Low pressure, gas thermal conductivity is small, less heat, was taken away by the gas
Hot wire temperature, thermocouple wire thermoelectric potential increase; On the other hand, the thermoelectric potential reduced. Circuits of thermoelectric potential measured with millivoltmeter, millivolt number in the table reflect the vacuum
The degree. In order to ensure that the voltage stability of the heating wire, and access to the regulated power supply. So measuring instrument is by measuring the thermoelectric potential millivoltmeter and regulation voltage electric heating silk
The source of two parts.