QPL32.002M00 Siemens Gas Pressure Switch

Overview

The Siemens QPL32.002M00 is a manual reset gas pressure switch designed for the supervision of low gas or air pressures in commercial and industrial burner applications. Part of the QPx32 series, this switch detects when pressure falls below a pre-set threshold, causing the electrical circuit to break and lock into a state that requires a physical reset once safe pressure levels are restored. It is engineered for durability with a NEMA 4 rating, making it suitable for both indoor and outdoor environments.

Features

• Manual reset mechanism ensures the system remains locked out until inspected by an operator
• Gold-plated contacts provide reliable electrical switching even in low-voltage applications
• NEMA 4 / IP65 rated enclosure offers protection against dust and water for outdoor use
• Ventless operation up to 7 psig eliminates the need for vent piping to the atmosphere in many installations
• Built-in side test connection allows for easy monitoring with a manometer or pressure gauge
• Compatible with a wide range of gases including natural gas, propane, butane, and hydrogen mixtures

Specifications

• Model: QPL32.002M00
• Pressure Range: 0.2 to 2 inches water column (wc)
• Maximum Operating Pressure: 15 psig
• Voltage Range: 24 VAC to 125 VAC or 24 VDC to 48 VDC
• Temperature Rating: -10 F to 140 F (-23 C to 60 C)
• Connections: 1/4 inch NPT pressure connection and 1/2 inch NPSM conduit connection
• Reset Style: Manual Reset
• Switch Type: Low Pressure (Normally Closed)

Applications

• Supervision of low gas pressure in gas trains for industrial furnaces and boilers
• Safety shut-off systems requiring manual intervention after a low-pressure fault
• Monitoring of air pressure in HVAC systems and combustion air supplies
• Suitable for use with natural gas, liquid petroleum (LP) gas, biogas, and air
• Integration into burner control systems to prevent unstable combustion or flame failure due to insufficient gas supply