The difference between the bimetallic thermometer and ordinary thermometer

As a bimetallic thermometer manufacturers, know some of the common sense of the thermometer is a must oh, some people might be in the thermometer is not very understanding, have been asking bimetallic thermometer and what is the difference between ordinary thermometer? Instrument to popularize knowledge to everyone today! Bimetallic thermometer using two different metal working in the principle of expansion degree of different temperature changes. Bimetallic thermometer is mainly used in industry of element is one with two or more pieces of metal laminate composed of multilayer metal together. To improve the temperature measuring sensitivity, is 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 let go. As a result of the spiral coil end fixed and the other end connected to a free rotating pointer, therefore, when the bimetallic strip feel the temperature change, Pointers can be on a circular dividing scale to indicate the temperature. This kind of instrument of temperature measurement range is - 80 ~ 650 ℃, the permissible error are scale equation 1. About 5%. The thermometer and the rod of glass liquid thermometer USES similar, but can be used under the condition of higher mechanical strength. Glass is according to the mercury thermometer, alcohol, toluene, etc liquid has obvious physical properties of heat bilges cold shrink. Most used in industrial boiler is glass mercury thermometer and mercury thermometer electric contact. Glass mercury thermometer consists of temperature measurement package, expansion tubes and parts such as scale, generally speaking, there are internal standard and external standard ( Also called type) Two kinds. In the expansion of the mercury thermometer thin tube inserted into the two wire, when the temperature reaches the rating, the mercury will lead on, due to the effect of current drive control system, or the device sends out sound and light alarm signal. Can know from the above introduction, each thermometer has different characteristics, we can according to the use of different feature selection suitable thermometer, however, so far the bimetallic thermometer is the most commonly used thermometer! It is an industrial necessities, the tips in life!