QPL31.050M00 Siemens Pressure Switch

Overview

The Siemens QPL31.050M00 is a manual reset low pressure switch designed for monitoring gas or air pressure in commercial and industrial burner applications. This precision instrument is engineered to break the electrical circuit when the pressure drops below a pre-adjusted setpoint, providing a critical safety function to prevent equipment operation under insufficient pressure conditions. It features a robust design suitable for HVAC and boiler systems, ensuring reliable performance in demanding environments.

Features

• Manual reset functionality requires human intervention to restart the system after a low-pressure trip
• Adjustable pressure range specifically calibrated for low-pressure supervision
• Ventless installation capability simplifies mounting and reduces installation costs
• Surge protection integrated to withstand pressure spikes up to 15 psi
• UL listed for the USA and Canada and FM approved for safety and quality assurance
• Impact-resistant construction designed for longevity in industrial settings

Specifications

• Pressure Range: 1 to 20 inches Water Column (WC) / 2.5 to 50 mbar
• Reset Type: Manual
• Maximum Operating Pressure: 6 psi (400 mbar)
• Maximum Surge Pressure: 15 psi (1 bar) for 2 seconds
• Operating Temperature Range: -40 F to 140 F (-40 C to 60 C)
• Electrical Rating: 10A at 125 to 250 VAC; 1/3 HP at 125 to 250 VAC
• Connection: 1/4 inch NPT threaded connection

Applications

• Supervision of air or gas pressures in gas trains of gas-fired equipment
• Low-pressure limit monitoring for industrial and commercial burners
• Integration into safety strings for HVAC systems and industrial boiler controls
• Use in systems requiring manual acknowledgement of safety shutdowns before resuming operation