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Bimetal thermometers usually increase the sensitivity of temperature measurement. Metal sheets are usually spirally wound. When the temperature of the multilayer metal sheet is changed, the amount of metal expansion or contraction of each layer is not equal, so that the spiral roll is rolled up or loosened.
Since one end of the spiral coil is fixed and the other end is connected to a freely rotatable pointer, when the bimetal feels a temperature change, the pointer can indicate the temperature on a circular graduated scale. The temperature range of this instrument is -80~500°C, and the allowable error is about 1% of the two-way scale. According to the connection direction of the bimetal thermometer pointer disk and the protection tube, the bimetal thermometer can be divided into four types: axial type, radial type, 135° type, and universal type.
1. Radial type bimetal thermometer: the indicator plate is connected in parallel with the protection tube;
2. 135 ° type bimetal thermometer: the pointer plate is connected with the protection tube at 135 °;
3. Universal type double metal thermometer: The connection angle between the pointer plate and the protection tube can be arbitrarily adjusted;
4. Axial type bimetal thermometer: vertical connection of the pointer plate and protection tube
The principle and installation method of bimetal thermometer
A bimetal thermometer uses two different kinds of metal with different temperature expansion coefficients. One end is welded to a fixed point, and the other end is twisted and deformed when the temperature changes, and it is converted into a pointer deflection angle to indicate the temperature. Core pull type refers to bimetal temperature sensing elements that can be removed from the outer protective tube and replaced. It is the most widely used on-site indicating thermometer.