QPL25.500 Siemens Pressure Switch

Overview

The Siemens QPL25.500 is a compact, high-precision gas pressure switch designed for monitoring and controlling air or gas pressures in industrial and commercial combustion systems. Engineered for reliability, this switch ensures system safety by opening or changing over an electrical circuit when the pressure either falls below or exceeds a manually adjusted setpoint. It is particularly effective for supervising gas trains and is compatible with various gas families, making it a critical safety component for high-demand burner applications.

Features

• Adjustable switching point allows for precise pressure monitoring tailored to specific system requirements
• Compact design enables easy integration into burner systems and gas trains with space constraints
• Automatic reset functionality ensures continuous operation after pressure returns to normal levels
• Versatile mounting options permit horizontal or vertical installation for flexible system design
• High-durability housing rated at IP54 provides protection against dust and water splashes in industrial environments
• Compatible with gas families I, II, and III, as well as air and other neutral gaseous media

Specifications

• Model: QPL25.500
• Adjustable Pressure Range: 100 to 500 mbar (10 to 50 kPa)
• Connection: 1/4 inch ISO threaded connection
• Maximum Operating Pressure: 69 to 72 kPa (depending on specific sub-model)
• Switching Voltage: AC max 250-280 V, DC 24 to 48 V
• Switching Current: AC max 6 A (resistive), DC max 1 A
• Protection Class: IP54
• Operating Temperature: -15 C to +60 C
• Weight: Approximately 120 g to 165 g

Applications

• Supervision of gas or air pressures in gas trains of gas-fired equipment and burners
• Use as a minimum or maximum pressure monitor in industrial combustion systems
• Monitoring pressure levels in HVAC and boiler systems to ensure safe ignition and operation
• Integration into OEM products requiring reliable pressure-dependent electrical switching
• Suitable for use with natural gas, propane, butane, and air in commercial heating applications