Overview
The Siemens QPH31.150M00 is a manual reset high-pressure switch designed for monitoring gas or air pressure in industrial and commercial burner applications. This high-precision safety device is engineered to break the electrical circuit when the sensed pressure rises above a user-defined setpoint. Part of the Siemens QP series, it ensures safe system operation by preventing over-pressure conditions in gas trains and combustion equipment.
Features
- Manual reset mechanism requires human intervention once the high-pressure limit is tripped
- High-pressure limit functionality breaks the circuit on pressure rise
- Adjustable pressure range with an easy-to-read scale for precise setpoint configuration
- Surge protection up to 15 psi to handle momentary pressure spikes without damage
- Flexible mounting options allow for horizontal or vertical installation
- Durable construction suitable for demanding industrial environments
- Ventless installation design for simplified setup
Specifications
- Model: QPH31.150M00
- Pressure Range: 10 to 60 inches Water Column (WC) / 25 to 150 mbar
- Reset Type: Manual
- Electrical Rating: 10A @ 125 to 250 Vac; 1/3 HP @ 125 to 250 Vac
- Connection: 1/4 inch NPT female pressure connection
- Maximum Operating Pressure: 6 psi (400 mbar)
- Maximum Surge Pressure: 15 psi (1 bar) for 2 seconds
- Operating Temperature: -40 F to 140 F (-40 C to 60 C)
- Approvals: UL listed for USA and Canada, FM approved, ISO 9001 certified
Applications
- High-pressure supervision for gas and air in commercial and industrial burners
- Integration into gas trains for gas-fired equipment and boilers
- Safety limit switching in HVAC systems to prevent equipment damage from over-pressure
- Monitoring of air or gas pressures in industrial combustion processes



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