The use of the bimetallic thermometer error

Bimetallic thermometer is used, when multi-layer metal temperature change, the layers of metal expansion or contraction, makes the spiral coil rolled up or loose, as a result of the spiral coil end fixed and the other end connected to a free rotating pointer. Under the permissible error in use, for you to introduce in detail the use of the bimetallic thermometer error.

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.

bimetallic thermometer in - usually a kind of temperature calibration in production 20 ℃ low temperature and if necessary, if you don't need, we usually will mark to the limit of temperature 0 ℃ to customers, users are sometimes used - party in Beijing area 40 ℃, this is can do, but in - Under the condition of 40 ℃ to consider whether to accept this error.

when the bimetallic strip feel the temperature change, Pointers can be on a circular dividing scale to indicate the temperature, the bimetallic thermometer temperature range is - 40 ~ 550 ℃, the permissible error: + / - 1. 6 degrees.

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