Pressure Switch
Product Overview
A Pressure Switch is an electromechanical or electronic device designed to monitor system pressure and automatically open or close an electrical contact when a preset pressure threshold is reached. It is widely used for alarm, control, and safety interlock functions in industrial, commercial, and utility applications.
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How it works (simple explanation)
The pressure switch senses pressure through a diaphragm, piston, or bellows. When the applied pressure reaches the set point, the sensing element moves and activates an internal switch. This action either opens or closes an electrical circuit, triggering an alarm, starting/stopping a pump, or protecting equipment.
What it measures
- Fluid or gas pressure
- Detects pressure above or below a preset value
- Monitors:
- Overpressure
- Under pressure
- Differential pressure (in some models)
Key advantages
- Simple and reliable operation
- No continuous power required (mechanical types)
- Fast response to pressure changes
- Easy set-point adjustment
- Suitable for harsh industrial environments
- Cost-effective pressure monitoring and control
Applications
- Pump and compressor control
- Boiler and steam systems
- Hydraulic and pneumatic systems
- HVAC systems
- Fire protection systems
- Process safety shutdowns
- Water treatment plants
- Oil & gas and chemical industries
Installation
- Installed directly on the pressure line, vessel, or manifold
- Ensure correct pressure range selection
- Mount according to manufacturer’s orientation guidelines
- Electrical wiring must follow safety and explosion-proof standards (if applicable)
Set and test the pressure set point after installation
Technical Specifications
Parameter | Specification |
Pressure Range | Vacuum to 1000 bar (model dependent) |
Set Point Adjustment | Adjustable or fixed |
Switching Type | SPDT, DPDT |
Accuracy | ±1% to ±5% of full scale |
Repeatability | ≤ ±1% |
Process Connection | 1/4″, 1/2″ NPT / BSP |
Wetted Materials | Stainless steel, brass |
Electrical Rating | Up to 250 VAC / 5 A |
Operating Temperature | −40 °C to +85 °C |
Protection Class | IP54 to IP67 |
Certifications | CE, ATEX, IECEx (optional) |