QPL25.150 Siemens Pressure Switch

Overview

The Siemens QPL25.150 is a compact pressure switch designed for monitoring gas or air pressures in industrial and commercial burner applications. It serves as a critical safety component that opens or changes over an electrical circuit when the pressure either falls below or exceeds a pre-adjusted switching point. This CE-approved device is engineered for integration into gas trains and is compatible with various Siemens burner controls and gas valves.

Features

• Adjustable switching point allows for precise pressure monitoring tailored to specific system requirements
• Automatic reset functionality ensures the switch returns to its normal state once pressure conditions stabilize
• Compact and durable design suitable for various mounting orientations, including horizontal and vertical
• Integrated pressure test point accessible with an Allen key for simplified maintenance and verification
• Robust construction with NBR diaphragms and an IP54 protection rating for reliability in industrial environments
• Versatile compatibility with gases of gas families 1, 2, and 3, as well as hydrogen and other neutral gaseous media

Specifications

• Model: QPL25.150
• Pressure Range: 0.5 to 15 kPa (5 to 150 mbar)
• Connection: 1/4 inch ISO threaded connection
• Switching Differential: 0.6 kPa
• Maximum Operating Pressure: 50 kPa (continuously up to 69 kPa)
• Switching Voltage: AC max 250 V, DC 24 to 48 V
• Switching Current: AC max 6 A (resistive), DC max 1 A
• Temperature Range: -15 C to +60 C (operating)
• Degree of Protection: IP54
• Weight: Approximately 0.12 kg to 0.17 kg depending on specific housing options

Applications

• Supervision of air and gas pressures in the gas trains of gas-fired equipment and industrial burners
• Used as a minimum or maximum pressure monitor to ensure safe combustion processes
• Integration into complex burner systems as a safety shut-off or limit control component
• Suitable for use in HVAC systems, boiler plants, and process heating applications requiring precise gas pressure regulation