当前位置:网站首页>行业资讯>正文
行业资讯
  • 热电偶和双金属温度计的区别
  • 本站编辑:杭州博阳仪器仪表有限公司发布日期:2019.04.06
热电偶,热电阻,双金属温度计都是温度测量仪表

 
热电偶可以将温度号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材质导体组成闭合回路,当两端存在温度差时,回路中就会产生电压,电压大小和温度相关。根据采用的金属(分度号)不同,测量范围在-200~1800℃范围分布。

 
热电阻是中低温区(-200~500℃)最常用的一种温度检测器。它的主要特点是测量精度高,性能稳定。
热电阻是基于电阻的热效应进行温度测量的,即电阻体的阻值随温度的变化而变化的特性。因此,只要测量出感温热电阻的阻值变化,就可以测量出温度。

 
双金属温度计是一种测量中低温度(-80℃-+500℃)的现场检测仪表
双金属温度计主要的元件是一个用两种或多种金属片叠压在一起组成的绕制成环性弯曲状的双金属片组成,利用两种不同金属在温度改变时膨胀程度不同,受热膨胀时,带动指针旋转,工作仪表便显示出热电势所应的温度值。

Thermocouple, heat resistance, bimetallic thermometer is temperature measuring instrument.

Thermocouple temperature, can be converted to the thermoelectric emf signal, through electric instrument (secondary instrument) is transformed into 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), measurement range distribution in the range 200 ~ 1800 ℃.

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 ℃ to + 500 ℃) of 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.

分享到: 0