Pressure switches can be used across a wide range of environments and industries. As a result, various types of pressure switch are available to ensure each device is best suited to its particular applications.
These devices are used in industries including:
- Automotive – for example, air filters
- Medical – for example, monitoring oxygen pressure levels
- Agriculture – for example, crop-dusting machinery
- Marine – for example, water filtration
Some of the key pressure switch types are explored in greater detail in the sections below:
Differential Pressure Switches
Differential pressure switches are used to detect the difference in pressure between two set points. If pressure drops or exceeds the pre-defined value, an alert will be triggered to make or break the circuit.
Differential pressure switches are typically used for preventative maintenance. Typical applications could include energy-saving, purifying, and monitoring air filters and ventilation flow.
Hydraulic Pressure Switches
These devices are designed to detect pressure changes and either make or break the circuit accordingly. Although non-contact versions are available, hydraulic pressure switches are primarily contact switches, meaning that the device uses physical contact to gauge pressure.
Hydraulic pressure switches are often used in the automotive and aerospace industries. A typical example of their use is for alerting drivers of the fuel level within a vehicle.
Pneumatic Pressure Switches
Pneumatic pressure switches are designed to detect increases or decreases in air pressure within pneumatic systems. Various types are available, including adjustable and non-adjustable devices, and they are suitable for both pressure and vacuum applications.
These instruments can be used in manufacturing and hydraulics and are commonly used to automatically monitor the pressure in compressed air systems.
Digital Pressure Switches
Both digital and mechanical pressure switches are available. Electronic pressure switches generate electronic switch output signals using programmable, integrated logic. They may also provide additional analogue signals, depending on the specific device.
Digital pressure switches are available in both adjustable and non-adjustable formats. They offer a greater degree of flexibility and the ability to program various functions, easily adapting to the requirements of any given application.