热处理车间使用的电炉大部分采用自动控制炉温的高温计,如—17,—47,型高温计等。这些高温计都是用热电偶测温的;热电偶在炉中受热产生了热电势,才使这些仪表指示温度和控制温度(控制通入电炉加热器的电源开关,使得在到达要求温度时自动切断电流,而温度降低后,又能自动通入电源,使炉子重新加热)。 Most of the furnaces used in the heat treatment plant use pyrometers that automatically control the furnace temperature, such as -17, -47, pyrometers and the like. These pyrometers are measured with thermocouples; thermocouples generate a thermoelectric potential in the furnace to cause the gauges to indicate temperature and control temperature (control the power switch to the furnace heater so that the temperature is automatically reached at the requested temperature Cut off the current, and the temperature decreases, but also automatically access to power, the stove reheated).