The resistance temperature sensor uses temperature sensor to transform the measurement temperature into a temperature measurement system for measuring resistance. The resistor -type temperature sensor is divided into two types: metal thermal resistance (referred to as thermistor) and semiconductor thermistor (referred to as thermal resistance).

Positive temperature coefficient thermal resistance-its resistance value increases with the increase in temperature.
Negative temperature coefficient thermal resistance-its resistance value decreases with the increase in temperature.

The characteristics of metal thermal resistance temperature sensor

1. In nature, the resistance of most pure metal conductors has the characteristics of changes with temperature. The characteristics of the characteristics are as follows:


 
① For the vast majority of metal conductors, A is not a constant maturity, but a function of temperature.
② But within a certain temperature range, it can be seen as a constant approximately.
③ Different metal conductors, A maintains the temperature range of the corresponding place corresponding to the constant.
④ Most metals have positive resistance temperature coefficient A.

2. The thermal resistance material for measurement must meet the following requirements:
① The resistance temperature coefficient A should be high. AT → S1 General Pure Metal A> Alloy A
② Within the temperature measurement range, chemical and physical properties are stable to ensure the accuracy of temperature measurement of thermal resistance.
③ Have good output characteristics.
④ Metal thermal resistance temperature sensor has a relatively high resistivity to reduce the volume and weight of the thermal resistance.
⑤ It has good processed and cheap. The more suitable materials are platinum, copper,
Nickel and so on.