â‘ : Common contact.
â‘ -â‘¢: Turn on when the pressure rises.
①-⑤ Turn on when the pressure drops.
M: Manual reset.
If the pressure switch has four wires, it is generally a pair of normally open points and a pair of normally closed points. The pump can only be started without stopping, which means that the pressure switch has no action. In theory, it is because the action value is set too high and needs to be lowered. In addition, if the pipeline is not closed, the pressure will not go up. To test its action, all valves must be closed. as the picture shows:
The wiring of the pressure switch is shown in the figure. The contact of the pressure switch cannot directly drive the load, and an intermediate relay needs to be added for contact isolation. Three contacts, upper limit, lower limit, and common point. How much pressure is set, there is a wired control in the corresponding place. Very simple, or some gauges have 2 lines, and then you need to manually adjust the pressure gauge.
SMC pressure switch is a simple pressure control device, when the measured pressure reaches the rated value, the pressure switch can issue an alarm or control signal. The wiring method of SMC pressure switch is shown in the figure:
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