Dwyer Instruments A-421 Pressure Tip

As a field technician, you know that accurate static pressure measurement is the baseline for diagnosing system performance. The Dwyer Instruments A-421 Static Pressure Tip is a professional-grade pickup designed for permanent installation in ductwork and air handlers. Featuring a 6-inch probe with four radially drilled .040-inch sensing holes, this assembly effectively eliminates the impact of air velocity and turbulence to provide a true static reading. The A-421 comes equipped with an integrated surge damper to stabilize fluctuating readings, ensuring your Magnehelic gages or digital manometers receive a steady signal even in high-velocity streams. Engineered with a mounting flange and an integral rubber gasket, it simplifies the process of creating a leak-proof seal during HVAC system commissioning. This duct pressure sensor is compatible with 3/16-inch and 1/8-inch ID tubing, making it a versatile addition to any industrial air monitoring setup where precision and durability are non-negotiable.

• Precise Sensing: Four radially drilled .040" holes isolate static pressure from velocity pressure for superior accuracy.
• Stabilized Readings: Built-in surge damper filters out pressure spikes and turbulence for a clean signal to your controllers.
• Simple Installation: Includes a mounting flange, rubber gasket, and screws for a secure, airtight fit in 3/8-inch duct holes.
• System Compatibility: Seamlessly integrates with differential pressure switches, transmitters, and Magnehelic gages.
• Durable Probe: The 6-inch insertion depth is optimized for bypass air and larger ductwork applications.

How do I install the A-421 for the most accurate reading?
Mount the tip in a straight run of duct at least five diameters downstream from elbows or transitions. Ensure the probe is perpendicular to the airflow so the sensing holes are not directly facing the air stream.

What tubing is compatible with this pressure tip?
The assembly includes a silicon rubber hose and is designed to fit standard 3/16-inch or 1/8-inch internal diameter (ID) plastic or rubber tubing used in typical HVAC control circuits.

Can this tip be used in high-temperature environments?
The A-421 is constructed for standard HVAC duct temperatures; for extreme heat applications, ensure your tubing and distal connections are rated for the specific thermal load of your system.

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.