QPB32.004A00 Siemens Gas Pressure Switch

Overview

The Siemens QPB32.004A00 is a high-precision gas pressure switch designed for the reliable detection of high or low gas pressure conditions in commercial and industrial combustion systems. Part of the versatile QPx32 series, this automatic reset switch is engineered to monitor a variety of media, including natural gas, propane, butane, hydrogen, biogas, and air. Its robust design features a NEMA 4-rated enclosure, making it suitable for both indoor and outdoor applications where protection against moisture and dust is required.

Features

• Automatic reset mechanism returns to active monitoring once pressure conditions are restored
• Gold-plated contacts come standard to ensure reliable switching in both high and low voltage applications
• Ventless operation capability up to 7 psig (500 mbar) simplifies installation by eliminating the need for external vent lines
• NEMA 4 / IP65 rated enclosure provides superior protection for outdoor or harsh environments
• Integrated side test connection allows for easy monitoring with a manometer or pressure gauge
• Dual-function design enables a single part number to be used for either high or low pressure supervision

Specifications

• Model: QPB32.004A00
• Adjustable Range: 0.8 to 4 inches water column (wc)
• Maximum Operating Pressure: 15 psig (1 bar)
• Switching Type: SPDT (Single Pole Double Throw)
• Pressure Connections: 1/4 inch NPT (+) and 1/8 inch NPT (-) for air
• Electrical Rating: 24 to 125 VAC / 24 to 48 VDC
• Operating Temperature: -10 F to 140 F (-23 C to 60 C)
• Materials: Die-cast aluminum lower body with a polycarbonate cover
• Approvals: cULus Listed, FM Approved, CE, and RoHS compliant

Applications

• Burner safety systems and flame safeguard controls for industrial boilers and furnaces
• Gas train monitoring to ensure safe fuel delivery in HVAC and combustion equipment
• Pressure proving for exhaust or recirculation fans in industrial ventilation
• Monitoring of alternative fuel systems involving hydrogen or biogas mixtures
• High and low gas pressure limit supervision in commercial heating plants