Pressure Switch

Pressure Switch

Pressure Switch Mechanism

A pressure switch is a device that, through a simple mechanism, activates an electrical contact when the pressure at its input reaches the desired level. This contact then sends an electrical signal to the intended location to trigger the corresponding action.

These devices use various mechanisms to transmit the performance of the pressurized environment to the desired electrical contact.

In a pressure switch, like a manometer or pressure gauge, the same elements that convert pressure into mechanical movement are used. These elements essentially sense the pressure and provide it to us as a mechanical action.

This device is designed to monitor the pressure behavior in the system, and when the pressure reaches the set point, it sends a command as an electrical switch through a process that varies depending on the type of pressure switch.

The pressure-sensitive element or sensor in a pressure switch can be one of the following types:

Capsule

Diaphragm

Bellows-Type

Bourdon

Piston-Type

In all of the above types, the pressure-applied element deforms and moves under the applied force to open and close the contact.

In some cases, a spring is provided to adjust the switch’s sensitivity, allowing the accuracy to be partially regulated.

The selected pressure switch may have a knob or adjustment scale that allows you to choose a specific pressure within its operating range. For example, if you have a pressure switch rated 0 to 6 bar with an adjustment scale, you can select a pressure of 1, 2, 3, 4, 5, or 6 bar at which the switch will activate.

In differential pressure switches, or Differential Pressure Switches, a second range is defined, which represents the operating sensitivity range. This range typically varies between 0.1 and 1 bar depending on the specific pressure switch.

In the previous example, if you set the pressure to 4 bar and the differential knob to 0.5, your switch will activate at 4.5 bar and reset at 3.5 bar.

Pressure switches can be categorized into different types based on their operating principle.

 Air

They are typically used in pneumatic systems or air compressors and represent a basic type of pressure switch.

 Gas

An important point for this type of pressure switch is to minimize sparking in their electronic components, as these switches are often used with flammable gases.

 Water

Their primary applications are water pumps and water supply lines, making them a basic type of pressure switch.

Steam

The main characteristic of this type of switch is its ability to withstand high temperatures. Additionally, these switches must also be able to tolerate moisture.

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