The difference between thermocouple and bimetallic thermometer

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 components of the material of conductor closed loop, when when there is a temperature difference on both ends of the loop can produce voltage, voltage is related to size and temperature. According to the metal ( Index number) Different measuring range in - 200 ~ 1800 ℃ range distribution.

in the thermal resistance is 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.