Dwyer Instruments A-302 Pressure Tip

The Dwyer Instruments A-302 Pressure Tip is an angled sensing component engineered for precise static pressure measurement in high-velocity HVACR environments. Designed with a 4-inch insertion depth, this static pressure tip effectively bypasses the turbulence and aspiration effects common near duct walls, ensuring your manometers and Magnehelic gauges receive a clean signal. The probe features four radially drilled .040-inch sensing holes that allow for consistent pressure sampling even in airflow velocities reaching up to 12,000 FPM.

For a professional duct static pressure sensor installation, the A-302 is built for durability and compatibility. It integrates seamlessly with 3/16" and 1/8" I.D. plastic or rubber tubing, making it a standard choice for monitoring pressure drop across industrial air filters, cooling coils, and blower discharges. To install, a 3/8-inch hole is required in the ductwork. Whether used for permanent system monitoring or diagnostics, this HVAC test instrument accessory is essential for maintaining accurate building automation and air distribution performance.

Key Benefits

• Enhanced Accuracy: Radially drilled holes eliminate impingement and aspiration errors caused by air velocity.
• High-Velocity Rating: Maintains reliable signal integrity in airflows up to 12,000 FPM.
• Universal Compatibility: Integrated 1/4-inch barb fits both 1/8-inch and 3/16-inch I.D. flexible tubing.
• Optimized Insertion: The 4-inch length ensures the sensing points are positioned correctly within the air stream, away from boundary layer turbulence.

Common Questions

How do I install the Dwyer A-302 in an existing duct?
Standard installation requires drilling a 3/8-inch hole. The tip is then inserted and typically secured via a mounting flange or appropriate sealant to prevent air leakage, ensuring the sensing holes are perpendicular to the airflow.

Can this probe be used for total pressure or pitot readings?
No, the A-302 is specifically designed as a static pressure tip. Its radial hole configuration is intended to nullify velocity pressure. To measure total pressure, an impact tube or pitot tube should be utilized.

Is the A-302 suitable for permanent monitoring?
Yes, its robust construction and angled design make it ideal for permanent mounting in air handling units (AHUs) to monitor filter loading and coil performance over time.

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.