In automobiles, temperature sensor ntc is used for cooling water temperature sensor, intake air temperature sensor, exhaust temperature sensor and temperature sensor inside and outside the car. Their working principles and methods are roughly the same, generally both are two-wire The control computer provides a 5V reference power supply to the sensor. The sensor converts the corresponding changes in resistance and temperature into a voltage change and inputs it to the control computer. The control computer uses this signal for related control.            In the operating temperature range, the critical temperature sensor whose resistance value jumps at the critical temperature is called the critical temperature sensor. Because the critical temperature sensor ntc has the characteristic that the resistance value changes rapidly at the critical temperature, it is usually used as a switch control. Sensor ntc is made of semiconductor materials doped with appropriate oxides and sintered at a high temperature above 1000°C according to the required shape.