Bimetallic thermometer in the use of what is the misunderstanding?

The temperature of the bimetallic thermometer is a kind of common measuring instruments, has widely used in many industries, can be directly measured with a variety of liquid in the process of the production of steam gas medium temperature. But the bimetallic thermometer when applied to a lot of people will enter the two misunderstandings, we all know that bimetallic thermometer is the application of heat bilges cold shrink principle, using two different temperature contraction coefficient of thermal conductivity sensor made of metal. What is the misunderstanding bimetallic thermometer application? Here are detailed said: in order to further testing of the bimetallic thermometer acuity, in the process of making pieces to metal spiral coil shape, when the temperature changes, the layers of the metal shrinkage or compression quantity range, makes the spiral coil produce deformation. One end of the spiral coil is firm and the other end with a can move the pointer to the connected, when the temperature of the bimetallic strip touch changes, Pointers can be on a circular dividing scale shows the temperature. Cause it's right here: many people think that WenFanChou bimetallic thermometer measured is - 50 ~ 550 ℃, promised to deviation are the scale range of less than 1%. True this is wrong, because, this made spiral coil shape metal thermal sensors, in low temperature circumstances easily fatigue, temperature difference is very big, is when the temperature above 550 ℃, want to consider taking thermocouple to deal with this situation; The highest temperature in the relevant material, bimetallic thermometer to measure - 40℃。 This is really a matter of, because, bimetallic thermometer in the process of production of temperature calibration in - at ordinary times 20 ℃, if need high temperature, if do not need, at ordinary times is standard to the lower limit of temperature 0 ℃ to customers, occasionally used - some place in the north 40 ℃, this is to be able to do, the in - 40 ℃ cases to consider whether to receive deviation this situation. The above is the erroneous zone, bimetallic thermometer use hope when use will be helpful to you!