Air conditioning pressure sensor
Model: SensorMass20250628S2
Measuring range: pressure sensor
Working pressure: 0～3.138MPa
Maximum pressure: 5.7MPa
Breakage pressure: 8.1MPa
Working temperature: -35℃～120℃
Working medium: HFC134a, PAG oil Power supply voltage: 5±0. 5 VDC
Output voltage: 0.5～4.7 VDC
Accuracy range: ±2.5%
Interface: 6/7-20UNF-2B
Description:
The air conditioning pressure sensor measures the refrigerant pressure of the air conditioning system so that the ECU can perform real-time monitoring, optimize system control strategies, reduce idle speed, and save energy.
Features
- High measurement accuracy can ensure that ECU can implement optimized control strategy for air conditioning system;
- According to customer’s choice, there are PWM or voltage output interface types;
- Ceramic capacitor structure, fast response speed, good compatibility with measurement medium.
Application
- It is specially used in air conditioning systems.
Specifications
| Product name | AC pressure sensor |
| Model | SensorMass20250628S2 |
| Working pressure | 0～3.138MPa |
| Output voltage | 0.5～4.7 VDC |
| Interface | 6/7-20UNF-2B |
What happens if the AC pressure sensor goes bad?
If your AC pressure sensor goes bad, it can throw your entire air conditioning system out of balance. Here’s what typically happens:
Common Symptoms of a Faulty AC Pressure Sensor:
Weak or No Cooling – The AC may blow warm air or cool inconsistently because the sensor isn’t accurately reporting refrigerant pressure.
Compressor Won’t Engage – The system may prevent the compressor from turning on to avoid damage, mistaking normal pressure for unsafe levels.
Intermittent Operation – The AC might cycle on and off rapidly, making strange clicking noises as the compressor tries to engage.
Warning Lights or Error Codes – You might see a check engine light or specific AC-related fault codes like P0530–P0533.
Increased Wear on Components – If the sensor fails to shut down the system during high or low pressure, it can lead to compressor damage or refrigerant leaks.
What is a normal AC pressure sensor reading?
Normal A/C pressure readings vary, but generally, the low-side pressure (blue side) should be around 30-40 psi, and the high-side pressure (red side) should be around 150-175 psi at 70 degrees Fahrenheit. These pressures can fluctuate based on ambient temperature, with higher temperatures leading to higher high-side pressures.
Where is the AC pressure sensor located?
The AC pressure sensor, often referred to as the low-pressure switch or high-pressure switch, is typically located on the AC lines near the air conditioning compressor. The low-pressure switch is usually found on the smaller pipe connected to the compressor, while the high-pressure switch is on the larger pipe. These switches are vital for regulating refrigerant pressure and preventing damage to the AC system.
How to reset AC pressure switch?
To reset an AC pressure switch, you’ll first need to identify whether it’s a high or low-pressure switch and then determine if it’s a manual or automatic reset type. Manual reset switches usually have a button or lever that needs to be pushed to reset, while automatic switches reset when the pressure returns to a normal range. If you have a manual reset switch and it’s tripped, you’ll need to locate it (usually near the compressor) and either push the button or flip the lever to the “on” or “auto” position. If the switch is an automatic reset type, you may need to wait for the pressure to normalize or troubleshoot the underlying issue causing the pressure to trip the switch.
