The principle and structure of common pointer thermometer

Thermometer according to the display mode to classification, we can be divided into liquid level calibration type, digital display type, pointer, such as categories, pointer thermometer is one of our common thermometer, the thermometer in production and life also often can see the figure of it. As the name suggests, the pointer thermometer is shaped like a dashboard with indicator pointer thermometer, some places called pointer thermometer thermometer, because of its appearance, like a kind of table to measure temperature, it is called a thermometer. Today the instrument first respectively introduce the bimetallic thermometer and pressure type thermometer. Bimetallic thermometer is made of metal principle of heat bilges cold shrink. It is a bimetallic strip as a temperature sensing element, is used to control a pointer. Bimetallic strip is usually with copper and iron rivet, and copper in the left, iron on the right. As a result of the copper heat bilges cold shrink effect is more obvious than iron, so when the temperature rises, the copper retraction of the plate bending to the right hands under the drive of bimetallic strip will turn to the right; On the other hand, the temperature become low, pointer under the drive of bimetallic strip is deflected to the left. Pressure type thermometer is the use of temperature measuring the pressure of the material in sealing system to measure temperature with the temperature change. According to the temperature material filling phase, inflatable, liquid type and steam type three, similar structure. According to its function division are classified as indicating, recording, alarm, type ( With the contact point) Such as type and temperature control type. They are basically the same structure. Pressure type thermometer mainly: the joint of inductive charging temperature, medium temperature bag, the pressure element ( Capillary) And pressure sensitive components ( Spring tube) All metal components, consisting of pressure type thermometer structure is simple, cheap, calibration is clear. Because can remote transmission, and does not need power supply, use does not produce sparks, it has anti explosion. Pointer thermometer have strong and durable, shows the advantages of intuitive, and metallic appearance is good, give a person a kind of beautiful feeling, is also one of the reasons why many people love pointer thermometer.