Industrial bimetallic thermometer test before use

Thermometer has many types, essential in everyday life is human body thermometer, are many industry on the thermometer, bimetallic thermometer, winding thermometer, pressure type thermometer, electronic thermometer, etc. Thermometer to test before use, the general program is the first thermometer in the heating temperature and time, and then let the thermometer, slow cooling, if again in thousand temperature set point value of electric suction side buttons. After many repeat this process, according to the falling in meter resistance value to assess the changes of the characteristics of the thermometer. Heating is gradually increasing, after every increase in the solidifying point of three-phase point of water, zinc and tin freezing point measurement of the resistance value of the thermometer, and often in gold, silver and to measure the freezing point of aluminum, moreover, underwent a special test depth test and leakage test, etc. Industrial thermometer needs to have better performance, can reach the temperature is very high, after all, the industry, in order to ensure the normal use of industrial thermometer, also want to test.