The bimetal thermometer is when the bimetal feels a temperature change, the pointer can indicate the temperature on a circular graduated scale, and can directly read the data, which is very intuitive and convenient. Therefore, the scope of application of bimetal thermometers is very wide, such as petroleum, chemical, machinery, shipbuilding and other fields. However, it is necessary to pay attention to the misunderstanding of bimetals in applications so as not to affect the accuracy of the measurement results. Then we need to understand the misunderstanding of bimetal thermometers .
1, high temperature range:
The temperature range of the bimetal thermometer is 200~650°C, and the allowable error is about 1% of the scale range. In fact, this is not correct, because this type of metal sheet is made of a spiral coil shape heat-conducting sensor. It will easily fatigue at a high temperature of 650°C, and the temperature difference is very large. Therefore, when the temperature exceeds 550°C, thermocouples should be considered. To solve this problem.
2, the lowest temperature range
The temperature range of the bimetal thermometer is 200 ~ 650 °C (this is not correct), the lowest temperature can be measured to -40 °C. In fact, this is not much, because the bimetal thermometer is usually calibrated at -20°C during production.
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