The use of the highest and most low temperature bimetallic thermometer

Bimetallic thermometer is very common, just as its name implies is to measure temperature, it is when the bimetallic strip feel the temperature change, Pointers can be on a circular dividing scale to indicate the temperature, can be directly read data, very intuitive and convenient. Therefore, the application range of the bimetallic thermometer is very broad, such as petroleum, chemical, machinery, shipbuilding and other fields. But need to pay attention to in the application of double metal error, so as not to affect the accuracy of the measurement results. Then we have to get to know the application of the bimetallic thermometer myth. 1, high temperature range: bimetallic thermometer temperature range is 200 ~ 650 ℃, permissible error are about 1% of the scale range. In fact this is wrong, because, this made of metal spiral roll shape of thermal conductivity sensor, under the condition of 650 ℃ high temperature fatigue, temperature difference is very big, so when the temperature exceeds 550 ℃, should consider the thermocouple is used to solve this problem. 2, the lowest temperature range bimetallic thermometer temperature range is 200 ~ 650 ℃ ( This is not correct) , the minimum temperature should be detectable 40℃。 In fact this is not much, because, bimetallic thermometer in - usually a kind of temperature calibration in production 20℃。 Above is the bimetallic thermometer is a common mistake in application, in fact some people in the use of bimetallic thermometer from time to tome a lot of improper operation, it will influence the accuracy of the bimetallic thermometer, hope the above points can give you the use of error corrected, the measurement results are accurate.