The working principle of bimetal thermometer is to weld two pieces of metal with great difference in expansion coefficient together.When the temperature changes, the different expansion coefficient results in different expansion and contraction, resulting in the bending deformation of the metal sheet.According to the different deformation, different rotation amount is generated. The rotation amount drives the connected rotating shaft and the indicator needle at the other end to indicate the temperature.It can directly measure the temperature of liquid, steam and gas in the range of - 50 ℃ to + 500 ℃ in various production processes.
The figure below shows a bimetal thermometer commonly used in Chinese instruments and equipment.
Type: Industrial bimetal thermometer
Upper cover ring: Crimped type, all stainless steel
Material: All stainless steel SS304
Thread:1/2"NPT( other options)
Surface diameter: Ø75mm
Probe diameter: Ø6.35mm
Probe length: 150 mm (50-1200mm optional)
Temperature range: 0-120 ° C (can be customized according to customer requirements)
Accuracy: ± 1.5-1-1.5%
Product features: on site display temperature, intuitive and convenient; safe and reliable, long service life, fast reading.
Precautions for use: attention should be paid to cleaning and inspection, and regular detection
It can be seen that bimetallic thermometers can be used when the ambient temperature is 300C. At the same time, it is necessary to know clearly for the specifications above.