QPL25.003 Siemens Pressure Switch

Overview

The Siemens QPL25.003 is a compact, automatic reset pressure switch engineered for the supervision of gas or air pressures in industrial and commercial burner applications. Designed for integration into gas trains, this switch ensures safety by monitoring whether pressure falls below or exceeds a predefined set point, triggering a circuit break or changeover to prevent hazardous operating conditions. Its small form factor and reliable diaphragm-operated mechanism make it a standard component for OEMs and burner system installers.

Features

• Automatic reset functionality for seamless operation within automated burner control systems
• Adjustable switching point via a manual setting knob located under the protective cover
• Diaphragm-actuated sensing element compatible with gas families I, II, and III, as well as air and neutral gaseous media
• Durable construction with an IP54 protection rating to safeguard against dust and splashing water
• Versatile mounting options allow for horizontal or vertical installation (not suspended)
• Integrated test point for easy pressure measurement and system calibration during commissioning

Specifications

• Pressure Range: 0.07 to 0.3 kPa (0.7 to 3 mBar)
• Connection Type: 1/4 inch ISO threaded connection
• Maximum Operating Pressure: 60 kPa to 69 kPa (permanent)
• Switching Voltage: Max AC 250V to 280V; DC 24 to 48V
• Switching Current: Max 6A (resistive)
• Operating Temperature: -15 C to +60 C
• Weight: Approximately 120g to 143g
• Approvals: CE approved, UL listed, FM approved, and RoHS compliant

Applications

• Monitoring minimum or maximum gas pressure in gas trains of gas-fired equipment
• Supervision of combustion air pressure for industrial burners and boilers
• Integration with Siemens VGD series gas valves for comprehensive safety shut-off control
• Use in HVAC systems, commercial heating plants, and industrial thermal processing units
• Suitable for systems utilizing natural gas, propane, butane, and hydrogen (less than 1%)