The bimetallic thermometer application pitfalls

Abstract: the bimetallic thermometer temperature range is 200 ~ 650 ℃ ( Baidu encyclopedia is explicitly specify) To allow errors 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.

taizhou double hua instrument bimetallic thermometer is the use of two kinds of different temperature of metal expansion coefficient, thermal conductivity sensor is made of, make full use of the principle of heat bilges cold shrink, solved the temperature in the process of temperature measurement accuracy, in order to improve the bimetallic thermometer temperature measurement sensitivity, will usually made of metal spiral coil shape, 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.

as a result, 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.

it's form the following two kind of erroneous zone:

1, the high temperature range bimetallic thermometer temperature range is 200 ~ 650 ℃ ( Baidu encyclopedia is explicitly specify) To allow errors 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.

instrument taizhou double China specializing in the production of thermocouples, platinum, rhodium thermocouple, thermocouple wear-resisting, anti-corrosion thermocouple, armoured thermocouple, bimetallic thermometer, tungsten-rhenium thermocouples, transmitter, K type thermocouple, electric stove wire, high temperature thermocouple, heat resistance, compensation conductor, such as infrared thermometer thermometer table.

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