Bimetallic thermometer table card and heat pipe material that how to choose?

Bimetallic thermometer is often used in daily life, general and commonly used in industry, petroleum, chemical, heating system, pipeline construction, machinery manufacturing and general factory. Today we say how to choose the bimetallic thermometer table card and heat pipe material. Choose bimetallic temperature time, consider normal temperature under test shall be located in the range of thermometer dial scale of 30% to 60%, when the temperature is beyond the scope, may cause loss of thermometer. For example, the actual measuring the temperature of the liquid is 40 ℃ to 60 ℃, then dial scale should select 0 ℃ to 100 ℃. When choosing the material of heat pipe is main consideration is whether the liquid is corrosive and pressure requirements. The working principle of bimetallic thermometer 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.