Small make up summarizes the mechanical expansion common term for thermometer

Mechanical expansion thermometer mainly by using the properties of thermal components of heat bilges cold shrink to transformation, so as to achieve the purpose of temperature measurement of heat, so mechanical expansion thermometer and have those? What do you call up again? Today we are going to know. Glass thermometer, glass thermometer is the use of the principle of heat bilges cold shrink to realize the temperature measurement. Due to the expansion coefficient of medium and the boiling point and freezing point of difference, so we common glass thermometer mainly include: water thermometer kerosene thermometer, mercury thermometer, the red pen. He has the advantage of simple structure, easy to use, relatively high measurement accuracy, low prices. Defect is measured on the floor and precision glass quality and temperature measurement and the nature of the medium. And cannot be far eastone, fragile. Pointer thermometer: is like dashboard thermometer, also calls the thermometer, used to measure at room temperature, 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: pressure type thermometer is the use of sealed container of liquid, gas or saturated steam heated volume expansion and pressure changes as the signal. Its basic structure is made up of bulb, capillary and indicator of three parts. It is one of the earliest methods of temperature control applied in the production process. Pressure type thermometer is: the advantages of simple structure, high mechanical strength, is not afraid of vibration. The price is low, does not need external energy. Defect is: limited temperature range, generally in - 80~400℃； Heat loss due to slower response time; Instrument sealing system ( Bulb, capillary, spring tube) Damage is difficult to repair, must be replaced. Measurement accuracy greatly influenced by environmental temperature, temperature package installation position, the precision is relatively low; Capillary transmission distance limit. Everybody traditionally mechanical expansion thermometer, such as the call, but the field is generally know the name of the thermometer, the popularity of more than just with all of you to do a simple, hope everybody can understand.