In automotive air conditioning system, the temperature change of refrigerant is directly related to its cooling efficiency, energy consumption control and system safety. Real-time temperature monitoring of refrigerant using refrigerant pressure sensors with NTC thermistor can ensure optimal operation of the air conditioning system.

The working principle of NTC thermistor in refrigerant pressure sensor is mainly based on its resistance-temperature characteristics, which monitor the temperature state of the refrigerant pressure sensor during the refrigerant circulation process. Refrigerant pressure sensor is generally installed in the refrigerant pipeline of the automobile air conditioning system so that the thermistor is closer to the refrigerant and ensure the accuracy of the temperature measurement process. When the temperature of the refrigerant changes, the NTC resistance value changes accordingly; This change in resistance value is then converted into a voltage/current signal and transmitted to the automotive air conditioning control unit. The control unit compares the received temperature signal with the preset ideal working curve, and then realizes the accurate monitoring of refrigerant temperature and the optimization of system efficiency by controlling the compressor speed, expansion valve opening, cooling fan start and stop and other dynamic adjustments.

In order to ensure the excellent performance of refrigerant pressure sensors in automotive air conditioning system, EXSENSE Electronics recommends the use of VT series automotive NTC thermistor. That:

1. High accuracy, reduces the error rate of temperature monitoring

During the phase change process, the refrigerant absorbs a large amount of heat, causing rapid and frequent temperature fluctuations. The refrigerant pressure sensor can use the high-accuracy characteristic of NTC thermistor to accurately capture these transient changes, avoid frequent compressor start and stop, refrigerant flow imbalance, etc. due to temperature measurement deviation, significantly improve the energy efficiency ratio of the air conditioning system and reduce the risk of accidents.

2. High temperature resistance, adapt to harsh working environment

The high-temperature working conditions of automotive air conditioning system requires high performance on the selected for refrigerant pressure sensor. EXSENSE’s VT series automotive NTC thermistor can withstand temperatures up to 150℃, allowing it to work stably in complex environments such as high temperature and high humidity, and avoid temperature monitoring failure problems caused by temperature drift.

3. Rapid response, realizes real-time adjustment of refrigerant temperature

In order to improve the acquisition time of refrigerant temperature changes, the excellent-sensitivity of the automotive NTC thermistor can assist the refrigerant pressure sensor quickly completes the temperature signal acquisition and transmission, providing real-time feedback to the air conditioning control unit, so that the control unit can make timely adjustments to ensure the operation of the air conditioning system in a better state.

As the core component of the refrigerant pressure sensor, the temperature monitoring capability of the NTC thermistor is beyond doubt. The outstanding electrical performances of the VT series automotive NTC thermistor not only assist in the accurate temperature measurement of refrigerants, but also effectively help automotive air conditioning system reduce energy consumption, improve the reliability and energy efficiency of automotive air conditioning system.