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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