Bimetallic thermometer is a representative of pointer thermometer

Pointer thermometer is shaped like the dashboard thermometer, bimetallic thermometer is one of the specific representation of pointer thermometer. Bimetallic thermometer is made of metal principle of heat bilges cold shrink. It is a bimetallic strip as a temperature sensing element, is used to control a pointer. Bimetallic strip is usually with copper and iron rivet, and copper in the left, iron on the right. As a result of the copper heat bilges cold shrink effect is more obvious than iron, so when the temperature rises, the copper retraction of the plate bending to the right hands under the drive of bimetallic strip will turn to the right ( Pointing to high temperature) ； On the other hand, the temperature become low, pointer deflection under the drive of bimetallic strip is to left ( Pointing to low temperature) 。 Execution standard JB/T8803 - 1998 GB3836- Dial 83 other parameters nominal diameter: 25,28,35,44,50,60,80,100,125,150 precision grade: ( 1. 0) 1. Thermal response time: 5 & le; 40 s protection grade: IP55 Angle adjustment error: error of Angle adjustment shall not exceed the range of 1. 0% return difference: pointer thermometer return difference should not be greater than the absolute value of basic error limits repeatability: pointer thermometer repeatability limit range should not be greater than the absolute value of the basic error limits 1/2