Using bimetallic temperature time, common measurement error is? Release date: 2019 05 - Read number 10:0

Bimetallic thermometer is a kind of measuring instrument in the field of low temperature test. Bimetallic thermometer can be directly measured - in the different production process 80 ° C to 500 ° C temperature range of liquid, steam and gas medium. 1. High temperature scope of bimetallic thermometer temperature measurement range of 200 ~ 650 ° C ( Baidu encyclopedia have a clear record) , allowing the error is about 1% of the scale range. In fact, this is wrong, because the shape of spiral coil thermal conductivity sensor made of metal plate, under the condition of 650 ° c high temperature fatigue, temperature difference is very big, so when the temperature more than 550 ° c, the thermocouple should be considered to solve this problem. 2. Low temperature scope clearly recorded in the relevant information: bimetallic thermometer temperature measurement range of 200 ~ 650 ° C ( This is not correct) , low temperature can be measured 40°c。 In fact, it is not much, because, bimetallic thermometer in the production of temperature calibration is usually in - 20°C ( If you need low temperature, if you don't need, we usually marked 0 ° C to customer the highest temperature, square area users sometimes use - in Beijing 40 ° c, it can be done, but, in the case of 40 ° c, it is necessary to consider whether can accept mistakes.