The difference between thermocouple and bimetallic thermometer1

Thermocouple, heat resistance, bimetallic thermometer is temperature measuring instrument. Thermocouple temperature, can be converted to thermoelectric emf signal, through electrical instrument ( Secondary instrument) Convert the temperature of the measured medium. The basic principle of thermocouple temperature measurement are two different ingredients of the material of conductor closed loop, when there is temperature difference on both ends, can produce a voltage in the circuit, voltage and temperature related to size. According to the metal ( Index number) Different measuring range in - 200 ~ 1800 ℃ range distribution. Thermal resistance is in low temperature area ( - 200~500℃） One of the most commonly used temperature detector. Its main characteristic is high accuracy, stable performance. The heating effect of the thermal resistance is based on the resistance temperature measurement, namely the resistance characteristics of the resistance varies with temperature. Therefore, as long as the measured feeling warm resistance of the resistance change, can measure the temperature. Bimetallic thermometer is a kind of measuring low temperature ( - 80℃- +500℃） The testing instrument. Bimetallic thermometer main component is a use two or more pieces of metal laminate made together around the ring of bimetallic strip bent, using two different metal expansion degree when temperature changes, thermal expansion, turns the pointer, should by the instrument will show thermoelectric potential value. 热电偶、热电阻、双金属温度计是温度测量仪表。 热电偶的温度,可以转换成热电动势信号,通过电气仪表( 二次仪表) 转换成被测介质的温度。 热电偶测温的基本原理是两种不同成份的导体材料闭合回路,当两端存在温差时,就会产生一个电压电路中,电压和温度大小有关。 根据金属( 指数) ,测量范围分布在200 ~ 1800℃范围。 热敏电阻在低温区( 200 ~ 500 ℃) 其中最常用的温度探测器。 其主要特点是精度高,性能稳定。 热阻的热效应是基于电阻温度测量,即电阻电阻随温度的特性。 因此,只要感觉温暖的电阻测量电阻的变化,可以测量温度。 双金属温度计是一种测量低温( 80℃到+ 500℃) 的测试仪器。 双金属温度计主要成分是用两个或两个以上的制作而成的金属层压在一起的环双金属片弯曲,使用两种不同的金属扩张程度当温度发生变化时,热膨胀,把指针,应该由仪器将显示热电潜在价值。