Pressure switches are used throughout a whole range of engineering applications, but unless you’re an electrician or use them regularly in your industry, you would be forgiven for not knowing exactly what a pressure switch is. In this article, we will be taking a look at what pressure switches are, what they are used for and some of the different types of pressure switches that you can buy.

What is a pressure switch?

A pressure switch is a device used to monitor and process pressure and provide feedback in response to a fall or increase in air or fluid pressure. This response to different levels of pressure is triggered by a sensing element which will vary depending on the type of pressure switch you are using. For example, a commonly used sensing element is a mechanical switch or piston. This sensing element could then shut down the system to prevent a leak, sound an alarm to alert you to the problem or provide a number of different functions.

What are pressure switches used for?

As mentioned, pressure switches can be used for an array of engineering applications, including commercial and industrial purposes. One example where a pressure switch might be used is in leak detection systems, where a change in pressure could be detected by a pressure switch which would then prevent a leak or any damages from occurring. Other common applications for pressure switches include more common, domestic purposes including washing machines, cars, air conditioning units and more. You could also find pressure switches in water pumps, gas furnaces, compressors and many other machines and items.

What are the different types of pressure switches?

There are many types of pressure switches available. Some are more suitable for different applications than others, and you may find different types of pressure switches easier to use depending on the purpose you have in mind. An older, simpler design may be useful for less demanding functions where as more modern switches may offer you advantages in larger scale positions. Here a just a few of the pressure switches you might come across:

• Mechanical pressure switches

Mechanical pressure switches are typically simple in comparison to other types of pressure switches, making them great for low cost applications. Despite this simplicity, most mechanical pressure switches have a reputation for reliability, though this may not be the case for more advanced purposes. A mechanical switch, like many pressure switches, has an adjustable switch point, though some mechanical pressure switches have pre-set levels.

• Electrical pressure switches

Electrical pressure switches offer a much higher level of reliability and flexibility than their mechanical counterparts. As a result, they are often used for applications that demand a high level of accuracy. A leak detection system on a large, industrial storage tank for example may use an electronic pressure switch due to their typically robust and reliable nature. Electronic pressure switches also often include a large display and button set up which makes them easier to use and ideal for monitoring larger systems.

• Single pole double throw and Single pole single throw pressure switches

A single pole single throw pressure switch is a simple, low cost way to monitor pressure in the system and are typically available with normally opened or normally closed contacts.
A single pole double throw pressure switch, or SPDT pressure switch for short, offers you the ability to choose between a normally open or closed contact positions with a switch. A SPDT pressure switch can also switch from one circuit to another, and can be used as an on-off switch. The main advantage of an SPDT pressure switch is that it can handle a larger current than its single throw counterpart, making it more appropriate for more demanding, larger scale applications.

There are, of course, a range of different pressure switches available in a variety of materials to suit a number of functions. If you’re looking at working with pressure switches, take a look at the options available and take the time to find the best one for the job at hand. A reliable pressure switch could save you a lot of time and stress in the long run depending on its purpose. Have a look online or speak to a professional today for advice on the best pressure switch for you.