![]() ![]() The first part of the testing process stays the same. If you’re lucky enough to have one on hand, however, you can easily test and calibrate your pressure switches by adding a hand pump with the special pressure gauge accessory to the end of the pressure switch. This accessory makes testing a lot easier but is usually reserved for the professional. When a certain pressure is reached, the switch will activate and pause or stop the electrical circuit that the pressure switch is a part of. As the name already suggests, a pressure switch has a pressure meter and a switch component. The simplest form of a pressure switch indicates when a system has reached a defined pressure. It is used to control equipment like industrial welding machines, but also your heating and ventilation system at home. What is a pressure switch?Ī pressure switch is a small device that you can find around equipment at homes, in cars, vending machines, and industrial manufacturing plants. In the article below, we will discuss some common problems you may run into, and the exact steps you need to test a pressure switch. Pressure switches keep your equipment working and safe, and a broken pressure switch will cause problems right away.Īt the same time, knowing if the problem is in your pressure switch or somewhere else in the air conditioner system can be a huge help and relief.Īlthough replacing a pressure switch is quite a technical job, testing a pressure switch and pinpointing the real problems with your air conditioner is something you can easily do yourself with a multimeter. If it operates at the wrong pressure levels, you can adjust the cut-in and cut-out pressures according to the steps above.Pressure switches are an important part of the functioning of a system, even though they technically aren’t part of the system. If the switch doesn’t operate properly, it can be replaced. Before testing, make sure the power supply is cut off. You can test the switch using an air source with a calibrated pressure gauge and a multimeter. How do you check a pressure switch on an air compressor? This also means that the pressure drop from the compressor to the machines must be as low as possible. The goal is to lower the pressure as far as possible without affecting the end users. However, each extra bar/psi comes at a high energy cost. This depends on your equipment, therefore there is no optimal pressure. ![]() What pressure should my air compressor be set at? By adjusting the pre-tension of the springs, the switch point can be altered. If the membrane deflects far enough, an electrical switch is operated that switches the compressor pump on or off. A mechanical spring acts on the other side of the membrane. The air pressure deflects a membrane inside of the switch. Frequently asked questions How does the pressure switch work on an air compressor? Furthermore, some switches only have one spring to adjust both cut-in and cut-out pressure simultaneously while the hysteresis is a fixed percentage which cannot be altered. Once more, please note that sometimes the small spring adjusts the cut-in pressure instead of the cut-out pressure. The shaded area shows the range in which the switch can operate.Īdjusting the cut-in pressure with the two larger set screws Step 5 - Adjust the cut-out pressureĪs a final step, the cut-out pressure is adjusted by pre-tensioning the small spring until the right value. The horizontal axis shows the cut-out pressure and the vertical axis the cut-in pressure. The graph below shows a typical pressure switch diagram. The switch can thus be easily set with 2 set screws. The hysteresis (difference between the cut-out and cut-in pressure) can often be set by a second smaller adjustment spring. Most switches allow you to adjust the cut-in and cut-out values proportionally by adjusting the main spring. ![]() The difference between the cut-in and cut-out pressure is called hysteresis. The lower and upper limit for compressor switches are referred to as the cut-in and cut-out pressure. Furthermore, there are changeover contacts that allow the user to choose between NC and NO operation. It breaks the circuit at the lower limit and closes the circuit at the upper limit. Typical pressure characteristics of a compressor tankĪ Normally Open (NO) switch operates the opposite way. ![]()
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