Now that you have the proper air compressor, everything appears to be going according to plan. However, you can’t be sure if a car air compressor performs as intended until you know how to interprete the pressure gauge on one. If it’s not, you might not realise it until it’s too late. Here is the knowledge you require to understand how to interprete an air compressor pressure gauge or car air pumps.

The air conditioner (A/C) compressor is one of the critical components that create the system’s necessary cycle, even though your car’s A/C system features a variety of components. Your complete A/C system won’t be able to produce cool air inside the vehicle, which is what its purpose is, without it. 

To activate the refrigerant’s capacity for heat transfer and adjust temperatures, it must first apply the proper amount of pressure (compression). Thus, you can maintain a cool interior temperature in the summer and a clear windshield in the winter. 

How an AC Compressor Operates

You must ideally understand the relationship between your air conditioner’s compressor and refrigerant. Freon is a refrigerant that is common here and is a substance that effectively turns hot air into cold air. Together, the compressor and its refrigerant play a crucial role in cooling. The engine of your car drives the air conditioning compressor, responsible for compressing the refrigerant that removes heat from the car’s cabin.

Swash plate type A/C compressors are the most popular. You will find the compressor maintaining a connection with the vehicle’s engine block and a pulley and V-belt driving it. An electromagnetic clutch starts the belt drive as soon as the air conditioner is in motion. 

The swash plate will oscillate six double-ended pistons in charge of compression and intake. Keep in mind that reed valves regulate the flow of refrigerant. A fine oil mist flows and combines with the refrigerant to properly lubricate the working parts.

The pressure decreases when the air conditioner compressor draws gas from the refrigerant through the evaporator. Before the compressor for the air conditioner takes that cold vapor and compresses it, lower pressure causes the refrigerant to evaporate at a low temperature— During this compression, warm refrigerant gas travels via pipes and condenses in the condenser.

At this point, it re-liquefies and releases heat before traveling into a region to cool. After that, the refrigerant absorbs heat from the passenger area. The evaporator transforms it back into a gas before the air conditioning compressor draws it in.

Why Do Air Compressor Gauges Exist?

PSI is the unit of measurement for pressure in air compressors. Depending on the particular model of air compressor and the gauges on it, this falls typically between 0 and 250.

An air compressor produces pressurised air and pneumatic equipment for a system. Internal combustion or electricity is frequently necessary to drive the motor. An air compressor gauge is a tool crucial to display the compressed air pressure in the system. To avoid over pressurising the system and ensure that it operates according to the application’s requirements, it is advantageous to be aware of the pressure the air compressor generates.

A PSI Gauge’s Reading

You can quickly and easily read your compressed air pressure gauge, like examining a thermometer or a car’s odometer. To begin, simply:

  1. Identify the units that your pressure gauge utilises and what each numerically designated unit is equivalent to.
  2. Determine how many each space represents PSI units by counting them between the designated units. Each space on the sample gauge corresponds to ten units.

Even if it’s simple to read a gauge, one must familiarise themselves with meters before utilising them so that they can rapidly keep track of the pressure level, while your compressor is running. By assisting you in knowing everything about your compressor from the minute you put it up, this method can help you save a tonne of time and anxiety in the future.

Change an Air Compressor Gauges

On air compressors for homes and small workshops, most air gauges are not of very high quality.

Over time, the needle may break, the shaft may malfunction, the plastic cover may crack, or more commonly, excessively humid air has, frequently over a short period, corroded the gauge internals to the point that the gauge no longer reliably displays pressure.

Air compressor gauges must provide the proper operating pressure for your downstream tools and applications for your air compressor to operate safely. If the tank gauge malfunctions, you won’t be able to notice the cut-out or decrease in pressure levels as it creates and consumes air. You must be aware of this if the pressure switches malfunctions and needs replacing.


You may ideally set up an appointment with Carorbis online today to learn more about air compressor gauges.