Bimetallic thermometer is used which two metals?

Bimetallic thermometer just as its name implies is to use the combination of two metals, said the material of bimetallic thermometer in fact, may be more than these two, shell material has the SS304, SS316, SS316L, etc, in this not much more. So named after two bimetal bimetal thermometer principle do what? Said this is the core of the bimetallic thermometer element, namely the bimetallic strip thermal components. Bimetallic strip materials commonly used can have three types of platinum, copper, nickel, and the Shanghai industry and trade co. , LTD. Our company USES the bimetallic strip is foreign imports of copper and nickel alloy. Different material temperature sensing element for temperature change and the expansion degree is not the same, and bimetallic thermometer is the use of the physical properties and to indicate the function of the temperature. Bimetallic thermometer is in low temperature ( - 80 - 500C） Environment temperature, will be 2 different types of metal and the overlying together made spiral bimetallic strip, end it in heat pipe, another end is connected to the pointer on the dial, form the free end, when the environment temperature changes, due to thermal expansion of the two kinds of different metal levels, will drive the pointer rotation, so the thermometer instantly present temperature value. Linear thermal expansion coefficient of copper metal name 17. 5 nickel and platinum 9 principles of bimetallic thermometer is such, in spite of this, due to the complex environment, thought, etc. , the error of the bimetallic thermometer value generally in scale range of 1. About 5%. Many users will be because of the limitation of equipment, thermometer and need extremely long or short, it will also affect the test result. Have a tip to share with you: the bimetallic thermometer is the use of temperature sensitive element and the temperature being measured object contact, when the measured temperature and reach thermal equilibrium temperature sensing element, is the measured temperature. Full contact, therefore, is to guarantee the precision of operation must pay attention to the point. We can observe, bimetallic thermometer temperature there will be a dot at the end of the pipe close to the mark, this is the fixed position of the bimetallic strip, so the analyte measured dot be sure to be in the highest level, no side temperature will have a lot of deviation. Thermometer expert small K will share with you here today, we see you next time!