Two materials for thermistor

1.Metal thermistor material

Such materials have a wide range of applications as thermal resistance thermostats, current limiters, and automatic constant temperature heating elements. Such as platinum resistance thermometer, nickel resistance thermometer, copper resistance thermometer and so on. Among them, the platinum side temperature sensor exhibits high precision and high stability characteristics in various media (including corrosive media). However, due to the shortage of platinum and the high unit price, their wide application has been limited. Copper temperature sensors are cheaper, but long-term use in corrosive media can cause significant changes in static characteristics and resistance. It is reported that the copper temperature sensor can be used in the air medium at a temperature range of -60-180 °C. However, in order to measure temperature at -60-180 °C for a long time and short-term measurement temperature at 250 °C, nickel temperature sensors are widely used in large quantities, and nickel is considered to be an ideal material because of their high sensitivity and satisfaction. Stability.

2. Alloy thermistor material

Alloy thermistor materials are also known as thermistor alloys. This alloy has a high electrical resistivity and is sensitive to changes in temperature and is a good material for making temperature sensitive sensors. The performance requirements of the thermistor alloy as a temperature sensitive sensor are as follows: (1) a sufficiently large resistivity; (2) a relatively high temperature coefficient of resistance; (3) a linear expansion coefficient close to the experimental material; and (4) a small strain Sensitivity coefficient; (5) When heating and cold ice in the working temperature range, the resistance temperature curve should have good repeatability.