Principle and characteristics of the bimetallic thermometer

For just entering and preparation for entering instrumentation industry, probably the bimetallic thermometer is not quite understand, we saw most is just a mercury thermometer, it is also one of the types of thermometer. Below we introduce what is bimetallic thermometer and how it works, there are several kinds of its classification, where attention in practical application, such as better convenient us. Bimetallic thermometer concept: the expansion of the bimetallic thermometer is the use of two different consisting of two metals bimetallic element, used for temperature measurement instrument. Bimetallic thermometer works: bimetallic thermometer is with different expansion coefficient of two kinds of metal or alloy plate temperature sensing element of firmly together, generally made spiral wound, usually at one end fixed and the other end with a pointer. When the temperature changes, the temperature sensing element change of curvature, free end rotation, drive the pointer on the dial indicator temperature values. The classification of the bimetallic thermometer:? Axial type: refers to the axis of the heat pipe with dial perpendicular to the plane. Radial type: refers to the axis of the heat pipe with dial parallel plane. Universal type: refers to the axis of the heat pipe with dial plane can be adjusted at any Angle. Note: when bimetallic thermometer used? The immersed depth of the heat: heat pipe length is less than 300 mm, immersion depth should not be less than 70 mm. Heat pipe length is greater than 300 mm, immersion depth should not be less than 100 mm. When installation should avoid collision heat tube, don't make the heat tube bending deformation occurs. The temperature of the instrument often work best in 1/2 - scale range - Three quarters. The characteristics of the bimetallic thermometer:? Mercury-free harm? Easy to use, long service life. Wide application range, measurement range is - 80 ℃ to 600 ℃. Is through the introduction of bimetallic thermometer have deeper understanding, Shanghai instrument and meter plant production of thermometer, with temperature sensing touched the world changes in temperature.