The bimetallic thermometer considerations when using

Bimetallic thermometer is real-time measuring instrument piping within the medium temperature. Its working principle is to put the two pieces of expansion coefficient difference is very big pieces of metal welded together. When the temperature changes, the difference is very big, caused the different expansion coefficient of expansion and contraction, the deformation of sheet metal bending. According to different deformation and produce different momentum, momentum to drive the connection shaft and the other end of the indicating needle, indicate the temperature. Bimetallic thermometer for thermometer, it is important to note that the following four problems when using, otherwise it will cause error. （ 1) Thermometer should be in the temperature of - environmental conditions 40° C ~ + 55° C, relative humidity is not more than 85% under the conditions of use. （ 2) Mechanical damage in use, the instrument has been heavily impact and collision, easy to cause the protection tube deformation, thus affecting the normal work of the measuring mechanism. ( 3) Fatigue damage after long time use, can make the performance of the sensor to change. （ 4) The depth of the thermometer inserted into the medium must ensure that is greater than the length of the sensing element.