Differential

Differential Pressure Switches

Differential pressure switches are designed to monitor the pressure difference between two points in a system and actuate an electrical contact when that differential reaches a preset value. Unlike gauge pressure switches that reference atmospheric pressure, differential models compare two independent pressure sources. These switches are commonly configured with two pressure ports—high and low—and are available in various sensing ranges and configurations to suit different system requirements.

In industrial environments, differential pressure switches are essential for detecting flow restrictions, filter conditions, pump efficiency, or system imbalances. They provide a reliable means of monitoring process performance and protecting equipment by initiating alarms, shutdowns, or control signals when pressure differentials exceed safe thresholds. Their precise operation supports automation, reduces manual monitoring, and helps prevent system failures caused by blockages, leaks, or component wear.

Built for demanding conditions, differential pressure switches often feature rugged housings, corrosion-resistant wetted materials, and adjustable setpoints. Many models are available with explosion-proof, weatherproof, or hermetically sealed enclosures to support installation in hazardous or outdoor environments. These switches can operate in a wide range of temperatures and pressure classes, making them suitable for both liquid and gas service.

Typical applications include monitoring across filters in HVAC and water treatment systems, pump suction/discharge differential monitoring in chemical processing and oil and gas operations, and detecting flow conditions in compressed air, steam, and hydraulic systems. Their ability to provide early warning and trigger protective actions makes differential pressure switches a critical component in industrial safety and process control.