Pressure switches – find manufacturers and suppliers

Pressure switches are electromechanical or electronic devices that monitor the pressure of a medium, e.g. air, water, oil or gas, and trigger a switching operation when a certain pressure value is reached.

They convert pressure values into switching operations and can be realized both mechanically and electronically.

Below you will find the operating principle and the main types of pressure switches, their typical areas of application and their advantages:

How pressure switches work:

Pressure switches can serve as a safety or control device by switching pumps, compressors, valves or process systems on or off.

At a defined switching point, switch-on or switch-off pressure, they open or close an electrical contact.
This converts the pressure at a defined value into an electrical signal.

The switching process is usually carried out by a mechanical element, diaphragm, piston or bellows, which deforms under pressure and thus actuates a microswitch, or by a sensor, in the case of electronic versions, which transmits a signal to an electronic evaluation unit.

Types of pressure switches:

1. Mechanical pressure switches:
   These devices work without electronics. An elastic element, e.g. diaphragm, spring or bellows, deforms under pressure.
   When a preset pressure value is reached, a microswitch switches.
   They are robust, cost-effective and well suited for standard applications.
2. Electronic pressure switches:
   Here, an electronic sensor, e.g. piezoresistive or capacitive, measures the pressure.
   Integrated electronics process the signal and control switching outputs.
   They enable more precise measurements, digital displays, programmable switching points and additional functions such as diagnostics or communication via fieldbuses.
3. Differential pressure switches:
   They do not react to absolute pressure, but to the difference between two pressure sides.
   They are used, for example, in filter monitoring, flow control or ventilation systems.
4. Vacuum or negative pressure switches:
   They are designed for areas below atmospheric pressure and trigger switching operations as soon as a certain vacuum level is reached.
5. Combined pressure and temperature switches:
   Some devices monitor pressure and temperature simultaneously and are suitable for complex process applications.

Typical areas of application for pressure switches:

Pressure switches are very versatile and can be found in:

1. Hydraulics and pneumatics:
Control of pumps, compressors, valves.

2. Water and waste water systems:
Pressure control in pump systems.

3. Heating and air conditioning systems:
monitoring of gas or liquid pressures, safety shutdowns.

4. Filter systems:
Control of differential pressure to indicate blockages.

5. Automotive engineering:
monitoring brake, oil or air conditioning system pressure.

6. Process and food technology:
Protection of systems and quality control.

Advantages of pressure switches:

• Safety: They protect systems and people from overpressure or underpressure.
• Automation: They enable automatic control without manual intervention.
• Reliability: Mechanical versions are robust and durable, electronic versions offer high precision.
• Flexibility: Large selection of pressure ranges, materials and connection types for a wide range of media.
• Energy efficiency: Optimized control of pumps or compressors saves energy and costs.
• Simple integration: They can be easily integrated into existing systems.

Pressure switches are indispensable elements in industry, building technology and vehicles. Thanks to the variety of designs - from simple mechanical to programmable electronic versions - they can be optimally adapted to the respective requirements and offer safety, precision and automation in a wide range of applications.

Here you will find an overview of the most important criteria to look out for when purchasing pressure switches:

The purchase of pressure switches is crucial for the reliability and efficiency of systems. An incorrectly selected pressure switch can lead to malfunctions, safety risks or unnecessary costs. As pressure switches are used in a wide range of applications - from industrial hydraulic systems to process automation - it is essential to consider technical, economic and logistical aspects when making a selection.

• One of the key selection criteria is the permissible pressure range. The switch must be able to withstand both the operating pressure and possible pressure peaks.
• The switching point (switch-on or switch-off value) should exactly match the process requirements.
• Check whether the switching point can be adjusted (often possible with mechanical versions using a spring).
• With electronic pressure switches, the switching point can often be precisely programmed.
• The pressure switch must be compatible with the medium to be monitored.
• Corrosion-resistant materials such as stainless steel or special coatings are required for aggressive media such as acids, alkalis or gases.
• For hygienically sensitive applications such as in the food or pharmaceutical industry, the materials must be FDA or EHEDG compliant.
• Seals and diaphragms are also critical - look for materials such as FKM, EPDM or PTFE.
• The selection of the process connection is an important point:
• Check whether threaded, flanged or quick connections are required.
• Electrical connection: classic screw terminals, plug connectors, e.g. M12, cable connection or digital interfaces.
• The design, compact, robust, explosion-proof, should meet the spatial and safety requirements.
• The choice between mechanical and electronic pressure switches depends on accuracy, service life and additional functions.
• Mechanical switches are inexpensive, robust and simple.
• Electronic switches offer greater precision, programmable switching points, digital displays and communication interfaces.
• For highly dynamic processes or a high degree of automation, electronic variants are often superior.
• High switching accuracy and repeatability are important for critical processes.
• Mechanical switches usually have larger tolerances.
• Electronic switches can maintain switching points to within a few percent of the final value.
• Also pay attention to the switching hysteresis range (difference between switch-on and switch-off point).
• Pressure switches are often used in harsh environments.
• Check protection types according to IP code, e.g. IP65, IP67, against dust and water.
• Temperature range of the device must match the environment.
• ATEX or IECEx-certified devices are required for potentially explosive atmospheres.
• A pressure switch should have a long service life and be low-maintenance.
• For mechanical switches, pay attention to the switching cycles.
• For electronic versions, pay attention to diagnostic functions or self-tests.
• The availability of spare parts and service from the manufacturer is an important criterion for professional purchasing.
• In addition to technical criteria, the economic aspect is also decisive.
• Consider the total costs: Acquisition, installation, maintenance and possible downtime costs.
• Consider delivery times, stock levels and flexibility of the supplier.
• Brand quality, certificates and technical support from the manufacturer can be decisive.
• Depending on the industry, certain standards and certificates are mandatory.
• Hygiene standards apply in the food industry.
• ATEX/IECEx certificates are required in potentially explosive atmospheres.
• SIL or TÜV approvals can be important for safety-critical applications.

The purchase of pressure switches requires careful consideration of technical, economic and regulatory aspects. Decisive factors include the appropriate pressure range, material and media compatibility, design, accuracy and the manufacturer's certifications and services. Taking these factors into account ensures that the selected pressure switch works reliably, safely and cost-effectively - and meets the requirements of the respective process in the long term.

Pressure switches can be purchased from various suppliers. Comprehensive information about manufacturers and suppliers of Pressure switches from all over the world can be found on Exportpages.