QPL32.060M00 Siemens Gas Pressure Switch

Overview

The Siemens QPL32.060M00 is a high-performance gas pressure switch designed for the precise supervision of gas or air pressures in commercial and industrial burner systems. This manual reset, low-pressure switch is engineered to detect when pressure drops below a pre-adjusted setpoint, providing a critical safety function by breaking the electrical circuit to prevent hazardous operating conditions. It features a rugged NEMA 4-rated enclosure, making it suitable for both indoor and outdoor installations, and is compatible with a wide range of fuel gases and air.

Features

• Manual reset mechanism requires human intervention after a trip, ensuring the system is checked before restarting
• Gold-plated contacts come standard, providing reliable switching for both high and low voltage applications
• NEMA 4 / IP66 rated enclosure offers superior protection against dust and water for outdoor use
• Ventless operation capability up to 7 psig simplifies installation by potentially removing the need for a vent line to the atmosphere
• Built-in side test connection allows for easy monitoring with a manometer or pressure gauge without disconnecting the switch
• Large, visible adjustment dial with a securing cover to prevent unauthorized tampering

Specifications

• Model: QPL32.060M00
• Pressure Range: 12 to 60 inches Water Column (wc)
• Reset Type: Manual Reset (Low Pressure)
• Maximum Operating Pressure: 15 psig (1 bar)
• Ventless Limit: Up to 7 psig (500 mbar)
• Electrical Rating: 24 to 125 VAC (8A max resistive) or 24 to 48 VDC (100mA max)
• Temperature Rating: -40°F to 140°F (-40°C to 60°C)
• Connections: 1/4 inch NPT pressure (+) inlet, 1/8 inch NPT vent/pressure (-) inlet, and 1/2 inch NPSM conduit entry
• Housing Materials: Die-cast aluminum base with a fiberglass-reinforced plastic upper body and polycarbonate cover

Applications

• Low gas pressure limit monitoring in gas trains for industrial burners, boilers, and furnaces
• Safety shut-off systems where a manual restart is required following a low-pressure fault
• Supervision of natural gas, propane, butane, biogas, and hydrogen fuel systems
• Combustion air pressure proving for forced draft burner applications
• Suitable for use in harsh environments requiring NEMA 4 protection, such as rooftop HVAC units or outdoor process heating equipment