What is the thermometer can correctly measure the temperature of the metal surface?

Measure the surface temperature is some engineering is an important aspect of temperature measurement. Especially in mechanical, metallurgy, energy and defense departments, measurement of the temperature of metal surface are very common. For example: heat treatment of castings, forgings, gas pipes, steam pipes, wall, etc. Various kinds of metal surface temperature measurement of the furnace, the temperature is from dozens of degrees, a few baidu to 1000 degrees, for such a temperature, the most commonly used method is to use direct contact measurement method. It is used in a variety of thermocouple, with adhesives or welding method, thermocouple and direct contact with the metal surface to be tested, then put on the thermocouple received display instrument of temperature measurement system, according to the metal surface temperature. But the test cost is higher, here introduce a bimetallic thermometer produced by instrument surface, specific as follows: single magnet surface thermometer ST200SM product parameters diameter: 63 mm temperature range: 0 - 300 c table cover: glass cover structure: axial type, magnets cover circle: pressure BianShi materials: metal case tooth head: no tooth material: SS304 stainless steel shell, aluminum table card, magnet it is to rely on the double metal heat bilges cold shrink principle of sensors to work, by contact spring or magnet at the bottom of the thermometer to measure the metal surface and reading. This kind of surface of the bimetallic thermometer can range from 30 to 500 c, c accuracy can be + / - 3%. For some of the requirements for accuracy is not high occasions, the use of thermometer of cheap is a money and beauty. But need to be aware of is the magnet thermometer not adsorption on the stainless steel material, in addition, should pay attention to clean up and check when using, regularly test the measured value.