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It is very important to gain the basic knowledge about gauges of an air compressor. Usually most of the workshop, DIY and small air compressors stores has two air compressors gauges. One of the air compressor gauge shows the compressed air pressure, which is the tank at that time. If you have ever seen how the air gauge is attached, you have observed that the tank air gauge is always plumbed directly to the tank of the compressor.
The tank air pressure gauge of the compressor is always fluctuates as the air is being pumped through the compressor pump in to the tank and as the compressed air is being used by the compressor.
The tank air gauge of the compressor can be attached back or it might have an attaching nipple at the end. Both types of the mounting are very economical, you can buy them both at the price range of $6-$11.
These both styles have pressure usually ranges from PSI 0-160 or may be PSI 0-200 depending on the brand of the mounting styles. It is important to note the choice between these two styles of mounting is always depend on how the air gauge is attached to a compressor.
Another important fact is that, if your tank air gauge has a pressure which range from PSI 0-160, then it is advisable to change it. Always feel free to exchange it with that air gauge which has a pressure range of about PSI 0-200. You are unable to use this device until the pressure of your selected air gauge is equal or better than the upper pressure range of the pump of the compressor.
The bad thing about the portable air compressor gauges is that, they rust out in the end. They can break. If it happens with the air gauge of your compressor, it is advisable to exchange it as soon as possible.
Tank air gauge of the compressor, show the air compressor has cut out and cut in pressures. It also tells you immediately about the detail of these pressure settings, especially when the pressure switch is working properly. However, if the switch settings are changing frequently then it can indicate a possible problem with the pressure switch of the compressor.
Regulator Air Gauge
Another air gauge on the common air compressor is the one, which is plumb to the regulator of the air compressor. It is consider as the most important air gauge as it show all the pressure settings of the regulator. Tank show might display PSI 150 when the tank of the compressor is full; still the pressure gauge can show only PSI 80 or whatever the pressure settings are on air regulator.
On the air compressor, air regulator gauge can be plumb straightaway onto the air regulator or in other case it can fixed in the board with the airline to the regulator, which is plumbed at the back.
You can increase the pressure by simply turning the knob of the air regulator in one direction. You can also decrease the pressure in the same way. It does not matter that in what direction you have turned the regulator knob; it will still show the pressure settings. It is important to note that pressure regulator will only regulate that pressure which will be higher than the settings.
If you want that, your regulator gauge show a higher pressure than PSI 100, then you should have more than PSI 100 in the tank of the compressor.
Air Compressor Gauges
Generally, the regulator gauge and tank air pressure gauge can have the same size. They also come with the similar mounting thread regardless the direction of the mounting. Depending on the range you want, they have the ability to show the different or same pressure ranges. The smaller air compressor has the tank gauge 1.5” in diameter and about 1” diameter regulator gauge.
Irrespective of the size, both of the air compressor gauges show the air pressure, which is flowing to the sensor through the mounting hole. As long as a new pressure gauge, which you get, fits the mount, fits the diameter and contain the same pressure range, you can use it easily.