Pressure Switches

Pressure switches are one of the most widely used types of switches that either complete or interrupt an electrical circuit based on the change in the pressure of a fluid (liquid, air, gas). They engage electromechanical or solid-state switches when a specific pressure threshold is met, thereby opening or closing a system. These switches operate by using various key components such as bourdon tubes, pistons, diaphragms, or membranes that move or deform when subjected to system pressure.

Working Principle of Pressure Switches

Pressure switches generally use a sensing element that reacts to changes in pressure. These elements include:

• Diaphragm: An elastic membrane that deflects under pressure.
• Piston: A movable device that slides within a cylinder in response to pressure.   
• Bourdon Tube: A curved tube that straightens or bends as pressure changes.

The movement of the sensing element is mechanically connected to an electrical switch. When the pressure extends to a specific setpoint, the switch either opens or closes the electrical circuit, relying on its formation.   

What are the Special Features and Benefits of Pressure Switches?

• Automatic system control, based on pressure changes, eliminates the need for manual intervention.  
• Avoid overpressure or under-pressure conditions that could spoil equipment or cause safety hazards. 
• Simple mechanical design verifies reliable operation in different environments.   
• Many pressure switches offer manageable setpoints, enabling customisation to specific application needs.

What are the Popular Pressure Switch Types?

• Mechanical Pressure Switches: Use mechanical components such as springs and levers to activate the switch.   
• Electronic Pressure Switches: Electronic sensors and circuitry are used to detect pressure alterations and control the switch.   

Versatile Uses of Pressure Switches

• Pneumatic Systems: Regulating air pressure in industrial machinery and automation systems.   
• Hydraulic Systems: Analysing oil pressure in hydraulic gear.
• Water Pumps: Upkeeping water pressure in residential and commercial water systems.   
• Air Compressors: Adjusting air pressure in air compressors. 
• Automotive: Observing oil pressure, tyre pressure, and other fluid pressures in vehicles.

What to Consider Before Buying a Suitable Pressure Switch for Your Application?

Several aspects should be kept in mind before making a purchase, such as:

• Pressure Capacity: The switch must be rated for the pressure range of your specific application.   
• Switch Type: Depending on the expected action, the switch can be normally open (NO) or normally closed (NC).
• Precision & Repeatability: The switch must be accurate and repeatable in its operation.   
• Environmental Conditions: The switch must be able to handle the application's environmental conditions, such as temperature, humidity, and vibration.

Summary

Pressure switches are integral control components found across various industries. They offer reliable and automated control based on pressure alterations. Their versatility and reliability make them critical for guaranteeing safety and efficiency in a wide variety of systems.