Mechanical pressure switches – benefits and function

druckschalter

What are pressure switches?

Pressure switches are mechanical or electrical switches that, actuated by the pressure of a liquid or gaseous medium, switch a second device on and off.

If you want to set up an irrigation system without a pressure switch, for example, the medium would only be watered if you turned the pump on and off manually for each watering process.

With a pressure switch, the pump is switched on and off automatically. The pump is switched on or off by predetermined pressures that are exceeded or not reached.

Where are mechanical pressure switches used?

Among other things, pressure switches are used to switch pumps, valves and compressors. They ensure that a predetermined pressure or fill level of a tank or pressure accumulator is not exceeded or fallen short of. For example, pressure switches can be found in use at petrol stations, in washing machines and in swimming pools.

How do mechanical pressure switches work?

The functional principle of the mechanical pressure switch is a pre-stressed spring with a membrane or a piston, which acts as a measuring element.

A low process pressure is absorbed by a large-area membrane. High pressures are absorbed by a small-surface piston.

To determine what pressure is required for the pressure switch to operate, use the preloaded spring. This can be screwed in with a screw. The further the screw is screwed in, the greater the effort required to activate the pressure switch. If the acting force ceases, the reset point is set.

When selecting the pressure switch, consider the maximum system pressure that will act on the pressure switch. The setting range should be smaller than the overload safety in order to be able to absorb pressure peaks.

How are mechanical pressure switches connected?

Mechanical pressure switches are connected to the pressure line via T-pieces with a ¼ inch connection thread. The pressure switch is often equipped with a barometer in order to be able to make an exact setting.

The mechanical pressure switch itself works without electricity. All that is needed is a power line that switches the pump on and off according to the mechanical impulses that the pressure switch outputs.

This universal pressure switch can be used in general mechanical engineering and the printing machine industry, as well as in pneumatics and hydraulics. SIL 2 according IEC 61508-2



Datasheet
User Manual

Chemical version (switching housing with surface protection) Pressure switches of the DNS series are suitable for monitoring and controlling pressures in chemical plants, process engineering and any situation where the pressure of aggressive liquids and gases must be monitored. All components of the sensor system are made from highquality stainless steel (1.4571) and welded using the latest methods without filler metals. The pressure sensor is gasket free plasma welded. SIL 2 according IEC 61508-2



Datasheet
User Manual

This universal pressure switch can be used in general mechanical engineering and the printing machine industry, as well as in pneumatics and hydraulics.



Datasheet
User Manual

Pressure switches of the DNS series and suitable for monitoring and controlling pressures in chemical plants, process engineering and any situationwhere the pressure of aggressive liqui sand gases must be monitored.



Datasheet
User Manual

The PSM-550 is used in industrial control, monitoring and alarm applications.

The switch point can be be specified by the customer on site.

Datasheet
User Manual

These high-quality absolute pressure switches have been developed especially for safety-critical applications.



Datasheet
User Manual

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