QPH32.020M00 Siemens Gas Pressure Switch

Overview

The Siemens QPH32.020M00 is a manual reset high gas pressure switch designed for commercial and industrial burner applications. This high-precision device is engineered to detect high-pressure conditions by monitoring gas or air pressure and breaking the electrical circuit when the pressure rises above the adjusted setpoint. Built with a NEMA 4 rating, it is suitable for both indoor and outdoor installations, providing reliable safety supervision for various gas-fired equipment.

Features

• Manual reset mechanism requires physical intervention once the pressure exceeds the setpoint
• Designed for use with natural gas, propane, butane, hydrogen, biogas, and air
• NEMA 4 rated enclosure for protection against harsh outdoor environments
• Ventless operation capability up to 7 psig for streamlined installation
• Built-in side test connection for easy manometer or pressure gauge integration
• cULus and FM approved for safety and performance compliance

Specifications

• Pressure Range: 2 to 20 inches water column (wc)
• Maximum Operating Pressure: 15 psig
• Ventless Pressure Rating: 7 psig
• Temperature Rating: -40 F to 140 F (-40 C to 60 C)
• Electrical Rating: 24 VAC to 125 VAC, 24 VDC to 48 VDC
• Connection: 1/4 inch NPT (+) pressure connection
• Materials: Die-cast aluminum lower body with a fiberglass-reinforced plastic upper body

Applications

• High gas pressure supervision in gas trains for industrial and commercial burners
• Safety shut-off monitoring in heating, ventilation, and air conditioning (HVAC) systems
• Pressure monitoring for specialized gas mixtures including hydrogen and biogas
• Integration into OEM burner control systems requiring manual reset safety features