Talking about the working principle of NTC temperature sensor of air conditioner evaporator

The air-conditioning evaporator uses liquid low-temperature refrigerant to evaporate easily at low pressure, transform into vapor and absorb the heat of the cooled medium to achieve the purpose of cooling. Therefore, a built-in NTC temperature sensor is required to monitor the temperature. Then the working principle of the NTC temperature sensor of the lower evaporator is described below.

The evaporator NTC temperature sensor is installed on the upper right wing of the air conditioner evaporator to accurately sense the temperature on the evaporator. Its main function is to detect the surface temperature of the evaporator and input the detection result to the automatic air conditioning control unit. When the evaporator temperature is lower than 2°C, the air conditioner stops running to prevent frost and ice formation on the evaporator. When the evaporator temperature is higher than 5°C, the air conditioning system can be switched on again. Therefore, the evaporator NTC temperature sensor is a protective electronic component of the air-conditioning electrical control system.

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