Pressure Switches

A pressure switch trips an electrical contact at a preset pressure point, protecting or controlling equipment rather than displaying a continuous reading like a gauge. NLS sources mechanical and electronic pressure switches with adjustable and fixed setpoints, SPDT and DPDT contact configurations, and IP65/IP66 enclosures, to IEC 60947-5-1, for Saudi pump, compressor, and process protection duty.

A pressure switch doesn't display a number the way a gauge does. It watches process pressure and changes the state of an electrical contact, open to closed or closed to open, the moment pressure crosses a setpoint, which makes it a control and protection device rather than an indicating one. That contact then trips a pump motor, sounds an alarm, or interlocks a compressor, all without anyone reading a dial.

NLS sources two main mechanical designs. Piston-actuated switches use a spring-loaded piston that moves against the process pressure and trips a snap-action switch at the calibrated setpoint, common on hydraulic and pneumatic systems and general pump protection. Diaphragm switches use a flexible diaphragm instead, better suited to lower pressure ranges and where a smoother, more repeatable trip point matters. Differential pressure switches compare two pressure points, a filter's inlet and outlet for instance, and trip when the difference crosses a set value, which is how a clogged filter or strainer gets flagged before it fails downstream. Electrical output is typically SPDT or DPDT contacts, rated for the load being switched, and enclosures come in IP65 and IP66 ratings for outdoor, washdown, and dusty industrial environments, built to IEC 60947-5-1 for low-voltage control circuit devices.

On Saudi projects, pressure switches show up on pump low-suction and high-discharge protection, compressor and air receiver interlocks, fire pump and jockey pump control logic, chiller and HVAC compressor safety cutouts, and hydraulic power unit protection on lifting and material-handling equipment. A dry-run protection switch on a booster pump set, for example, isn't optional in most Saudi water utility specifications.

NLS quotes pressure switches against the required setpoint range, differential, electrical contact rating, process connection, and enclosure protection class, and returns a priced quote in USD. Standard fixed or narrow-adjustable-range switches in common configurations typically source fastest; wide-adjustable-range or hazardous-area-certified switches are more often built to order and carry a manufacturer-confirmed lead time.

Specifications

✓Mechanical types: piston-actuated (general purpose), diaphragm (low pressure), differential pressure (filter/strainer monitoring)
✓Setpoint: fixed or field-adjustable range, factory-calibrated
✓Contact configuration: SPDT, DPDT, rated for the switched electrical load
✓Enclosure protection: IP65, IP66 for outdoor and washdown duty
✓Standard referenced: IEC 60947-5-1 (low-voltage control circuit switching devices)
✓Process connection: threaded NPT or BSP, wetted parts in brass or stainless steel
✓Options: hazardous-area (Ex) certified variants for classified zones

Frequently Asked Questions

What's the difference between a pressure switch and a pressure gauge?+

A pressure gauge gives a continuous visual reading of pressure on a dial. A pressure switch doesn't display anything, it trips an electrical contact at a preset point to start, stop, or alarm equipment automatically, which makes it a control device rather than an indicating one.

Can a pressure switch's setpoint be changed after installation?+

Field-adjustable switches allow the setpoint to be changed within a defined range using an external adjustment screw. Fixed-setpoint switches are factory-calibrated to one point and can't be adjusted on site, which is why the required setpoint needs to be confirmed before ordering.

What does an IP66 rating mean for a pressure switch enclosure?+

IP66 means the enclosure is fully protected against dust ingress and can withstand high-pressure water jets from any direction, which suits outdoor installations and washdown areas common on Saudi process and utility sites.