![]() ![]() On the other hand, electronic/solid state pressure switches have an adjustable deadband. Such switches are more reliable and require less time to install. With a fixed deadband, you have to get a switch that matches your compressor exactly. Most mechanical or electromechanical pressure switches such as the Asco below have fixed deadbands. For example, if the deadband cuts in at 90 PSI and cuts out at 100 PSI, it has a deadband of 10 PSI. DeadbandĪ pressure switch’s deadband is the difference between its high-pressure and low-pressure setpoints. ![]() Make sure that fittings such as O-rings, pistons, diaphragms, and other wetted materials are compatible and fit perfectly.Įven a small surface rip in an O-ring will lead to pressure leaks, so make sure there is no visible damage as well. There have been too many horror stories of leaks and condensation happening after swapping a pressure switch. For example, most cannot have setpoints in the lower 15% of their range because they become inaccurate below that level.Įxpert Tip: If you can’t get a pressure switch that fits your air compressor’s requirements, look for one with adjustable controls instead. Whereas electronic pressure switches allow you to set your operating points along their full range, mechanical switches have a limited adjustable range. Most compressors operate on 110V or 240V mains, which almost all pressure switches can handle. Similarly, the electrical power components should be well within the manufacturer’s guidelines. ![]() The one below is perfect for such applications. A high proof pressure keeps the switch functional even after surges. Issues such as faulty components and restricted flow can cause these extremely high pressure (overpressure) conditions. Make sure that the switch’s proof pressure-the maximum pressure it can handle without damage-is high enough to account for spikes and surges. ![]() For example, if your compressor operates at 100 – 150 PSI, you should get a pressure switch that cuts in and out at those points.Įxpert Tip: Modern solid state pressure switches are adjustable, so you can buy one with higher operating limits and tune it to the level you need. The switch's operating pressures should match the minimum and maximum pressures for the air compressor. Here are the most important features to consider in a pressure switch. The features of a pressure switch vary from one model to the next, depending on the manufacturer, type of switch, and intended applications. Some of the most common names you are likely to come across include:Īll these brands produce high-quality pressure switches for air compressors, but the design and features of each can vary. There are many companies that make pressure switches for compressors. The Tecumseh low-pressure model below is a good example of a pressure switch that you are likely to find today. With advancements in technology, modern electronic pressure switches operate differently and are much more efficient. Pressure switches used to be electromechanical, relying on moving parts that reacted to changes in pressure to make or break electrical contact. 1 - Know What Kind of Pressure Switch You WantĪn air pressure switch for an air compressor should disconnect power at a certain maximum pressure, then kick in again when the pressure drops below the minimum point.
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