REFRIGERANT PRESSURE SENSOR [MANUAL AIR CONDITIONER]
2016 – MX-5 – HVAC
REFRIGERANT PRESSURE SENSOR [MANUAL AIR CONDITIONER]
Purpose, Function
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The refrigerant pressure sensor detects the refrigerant pressure in the refrigeration cycle and converts it to an electric signal.
Construction
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The refrigerant pressure sensor is located in the cooler pipe.
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The refrigerant pressure sensor consists of a pressure detecting part and signal processing part.
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A capacitance type has been adopted to the pressure detection part of the refrigerant pressure sensor.
Operation
1. Pressure is applied to the ceramic diaphragm of the pressure detection part according to the refrigerant pressure in the cooler pipe.
2. The shape of the ceramic diaphragm changes by the applied pressure, and the amount of clearance between the electrodes changes.
3. The refrigerant pressure sensor detects the electrical load (capacitance) which changes according to the clearance amount, and converts it to a voltage value at the signal processing area. The voltage increases if the refrigerant pressure increases, and decreases if the refrigerant pressure decreases.
Fail-safe
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Not applicable