A.J. Antunes 8021203090 Pressure Switch

The A.J. Antunes 8021203090 Pressure Switch is a professional-grade air differential pressure switch designed for precision monitoring in HVAC and industrial air handling systems. This Model SMD unit features a versatile operating range of 0.17" to 6" WC (Water Column), allowing technicians to accurately calibrate set points for proof-of-airflow and filter static pressure drop. Engineered with a Single Pole Double Throw (SPDT) contact configuration, it provides flexible wiring options for normally open or normally closed circuits, essential for safety interlocks and fan status indication. The lightweight 0.54 lbs housing facilitates easy mounting in tight mechanical spaces while maintaining high sensitivity to low-pressure fluctuations. Whether you are servicing industrial ventilation systems or commercial air handlers, this adjustable air pressure switch ensures reliable switching performance under varied pneumatic conditions. Its rugged construction is built to withstand the rigorous demands of mechanical rooms, ensuring long-term field stability for critical differential pressure sensing applications.

Key Benefits for Contractors

• Precise Calibration: Wide 0.17" to 6" WC range covers most commercial air proving and filter monitoring requirements.
• Circuit Flexibility: The SPDT switch allows for simultaneous control of signaling devices and equipment shutdowns.
• Direct Replacement: OEM-quality Antunes 8021203090 ensures compatibility with existing mounting footprints in SMD-series installations.
• Accurate Sensing: High-sensitivity diaphragm detects minute changes in pressure to prevent blower motor burnout.

Common Questions

What are the electrical ratings for this SPDT switch?
The Antunes SMD series typically supports standard pilot duty ratings. Always verify the amperage draw of your controller or starter coil against the switch plate specifications to ensure proper load matching.

Can this be used for both positive and negative pressure?
Yes, as an air differential pressure switch, it monitors the difference between two pressure points. It can be plumbed to sense positive pressure, vacuum (negative pressure), or the differential across a component like a filter or coil.

Is the set point adjustable in the field?
Yes, this model features an adjustable scale, allowing technicians to dial in the specific inches of water column required for the specific system's static pressure profile.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.