How does a compressor switch work?

The air pressure deflects a membrane inside of the switch. A mechanical spring acts on the other side of the membrane. If the membrane deflects far enough, an electrical switch is operated that switches the compressor pump on or off. By adjusting the pre-tension of the springs, the switch point can be altered.

What is a closed switch on a compressor pump?

They are used to keep the pressure in a tank between a pre-set lower and upper pressure. When the tank pressure crosses the upper or lower limit, an electrical switch is operated. Normally Closed (NC) switches break the circuit when the pressure crosses the upper limit. This will switch off the compressor pump.

What is a 3A certified sanitary pressure switch?

Like other 3-A certified sanitary pressure switches, these switches trigger controls and alarms when food- processing, pharmaceutical, and biotech lines reach a set pressure, but they also have a sanitary adjustable setpoint ring that you twist to make quick changes.

How do air pressure switches work?

Often used with ovens, dryers, and HVAC systems, these switches detect small differences in air pressure to indicate a filter is clogged or help you maintain a certain air pressure. To check the difference in pressure between two points, these switches have a dial indicator that shows differential pressure in real time.

How do you adjust spring pressure?

By turning the nut on the rod end, the spring pressure can be adjusted. The small spring (see Figure below) is used to adjust the differential pressure (hysteresis). The large springs are used to adjust the cut-out and cut-in pressure simultaneously and proportionally.

How do I adjust the cut-out pressure?

As a final step, the cut-out pressure is adjusted by pre-tensioning the small spring until the right value. Once more, please note that sometimes the small spring adjusts the cut-in pressure instead of the cut-out pressure.