How do I know if I need a pressure sensor or a pressure switch?

Published: 7th August 2025 | Issue 100 Share article:

When choosing between a pressure switch and a pressure sensor, the key lies in understanding your application and how you intend to monitor or control pressure within your system. Choosing the right device helps avoid over-engineering or under-protecting your process.

Key Differences Between Pressure Switches and Pressure Sensors

Feature

Pressure Switches

Pressure Sensors

Functionality

On/off control – opens or closes a circuit

Continuous pressure measurement

Output

Binary output (above/below threshold)

Continuous analogue or digital signal (e.g., 4–20 mA, 0–10 V)

Applications

Simple control systems

Advanced monitoring and control systems

Types

Mechanical or electronic

Diaphragm, capacitive, piezoresistive, etc.

Cost

Simpler design – lower cost

Higher cost due to increased functionality

 

Typical Applications

Pressure Switch Applications – Simple, Reliable Control

Pressure switches are ideal for systems that need on/off control based on pressure thresholds.

  • Industrial Equipment: Common in air compressors, refrigeration units, and filtration systems to automate pressure control and trigger alerts.
  • Machinery & Flow Systems: Used in wastewater treatment and pipeline control for system safety.
  • Vehicles: Monitor oil pressure and regulate air suspension systems.
  • Buildings: Found in HVAC units, water pumps, wells, and boiler systems to protect equipment and maintain consistent pressure.
  • Specialised Uses: Also used in medical oxygen systems, agricultural spraying, and marine water systems.

Pressure Sensor Applications – Data-Driven Precision

  • Industrial Monitoring: Essential in manufacturing, oil & gas, and water treatment for tracking and optimising pressure in real time.
  • Automation & HVAC: Enable precise control of actuators, hydraulics, and airflow systems.
  • Transport & Aerospace: Measure pressure in tyres, fuel, oil, and braking systems, as well as in aircraft cabins and hydraulics.
  • Medical & Robotics: Support critical functions in ventilators and robotic movement with high precision.
  • Emerging Tech: Used in renewable energy (hydrogen, wind) and environmental monitoring (air quality, groundwater).
  • Smart Buildings: Enhance building automation through pressure data in fire suppression and HVAC systems.

Consider your system's requirements and complexity

Top Tip!

  • Use a pressure switch for simple on/off control.
  • Use a pressure sensor for real-time pressure feedback, trending, or automation integration.

Need Help with a pressure monitoring application?

Our Pressure & Flow team is ready to assist with expert advice, product recommendations, and proof-of-concept support. 

Search related valve / actuator articles:   OEM Automatic LtdIssue 100Sensors

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