Principle work of bimetal thermometer

Bimetal thermometers work on the principle that two different metals expand differently when the temperature changes. It is known that the main component of an industrial bimetal thermometer is a multilayer metal sheet which is formed by laminating two or more metal sheets together. In order to improve the sensitivity of temperature measurement, the metal sheet is usually formed into a spiral shape. When the temperature of the multilayer metal sheet is changed, the amount of metal expansion or contraction of the layers is unequal, so that the spiral coil is rolled up or loosened. Since the end of the spiral coil is fixed and the other end is connected to a freely rotatable hand, when the bimetal feels a temperature change, the pointer can indicate the temperature on a circular indexing scale.

Ultra-small versatility; 2-wire 4-20mADC output, long transmission distance, strong anti-interference ability; cold end, temperature drift, nonlinear automatic compensation; high measurement accuracy, long-term stability; epoxy resin casting inside the temperature module Process, suitable for all kinds of harsh and dangerous places; thermocouple temperature change, can be used without compensation wire; LCD, digital tube, pointer and other indication functions, convenient for on-site monitoring.

The temperature range of this meter is 200~650Â°C, and the allowable error is about 1% of the two steps of the scale. This thermometer is similar in use to a rod-shaped glass liquid thermometer, but can be used under conditions requiring higher mechanical strength. The glass thermometer is made based on the principle of heat rise and contraction of liquids such as alcohol and mercury.

Global hardware network