Boiler Air & Draft Differential Pressure Switch

About this part

High-precision adjustable differential air/draft pressure switch engineered to monitor air flow, differential combustion air pressure, and flue gas draft on industrial boilers and burners. Prevents burner startup or triggers immediate safety shutdown if combustion air fan fails, flue ducts become obstructed, or draft pressures deviate from safe operational setpoints.

Key features

• High sensitivity silicon/NBR diaphragm responsive to micro-pressure variations (mbar / Pa)
• Calibrated rotary setting dial with clear scale for easy switching setpoint adjustment
• Positive, negative, and differential pressure measurement ports
• SPDT electrical microswitch contact rated for safety interlock circuits
• Rugged transparent dust and splash-proof IP54 enclosure

Typical applications and wear

FD fan combustion air proofing, flue gas ID fan interlocks, filter blockage monitoring, and stack draft control. Wear involves diaphragm hardening and dust fouling on impulse sensing tubes.

Compliance

Supports the combustion-air and draft interlocks commonly used in industrial systems; applicable EN 1854, NFPA 85, and local requirements must be verified for the installation.