A-419A

Overview

The Dwyer Instruments A-419A is a ceiling-mounted static pressure pickup designed for HVAC applications. It features a metal construction with a 60-micron filter to prevent debris ingress. The unit includes a universal sensing probe, an adjustable mounting flange, and a 1/4-inch adapter. It connects via tubing with a 1/4-inch inner diameter and 3/8-inch outer diameter, extending approximately 3 feet in length. This assembly facilitates accurate measurement of static pressure drops across cooling coils and air filters when used with compatible gauges or manometers.

Feature Summary

• Ceiling mount design for stable installation in ductwork environments
• Integrated 60-micron filtration to protect sensing elements from particulate contamination
• Adjustable mounting flange allows for precise positioning relative to airflow
• Includes pre-assembled tubing and adapters for direct connection to measurement instruments

Applications

• Measuring static pressure drop across cooling coils
• Monitoring pressure differentials across air filters
• Integration with manometers and pressure switches for system diagnostics

Procurement Notes

Verify that the specific order includes the complete kit comprising the sensing probe, flange, adapter, and tubing. Confirm compatibility with existing gauge ports requiring 1/4-inch connections. Ensure the 60-micron filter specification meets the environmental cleanliness requirements of the installation site to maintain long-term accuracy.

Selection Notes

Select this model when a permanent, ceiling-mounted solution is required for static pressure monitoring in HVAC systems. It is suitable for environments where access to the duct interior is limited but external measurement points are necessary. Consider the included tubing length and adapter size to ensure seamless integration with current instrumentation setups without requiring additional custom fittings.

Part Context

This component belongs to Dwyer Instruments' line of pressure measurement accessories. It serves as a critical interface between the air handling system and diagnostic tools. The product supports maintenance routines by providing a reliable point for assessing system performance and identifying blockages or inefficiencies in air distribution networks.

Replacement Considerations

Ensure substitute parts match the 1/4-inch port size and include equivalent filtration. Verify that the replacement unit offers similar mounting flexibility and tubing length to maintain installation integrity without modifying existing ductwork structures.

FAQ

What is the purpose of the 60-micron filter?

The filter prevents dust and debris from entering the sensing tube, ensuring accurate pressure readings and protecting connected instruments from contamination.

Can this unit be used with digital pressure gauges?

Yes, it is designed to connect to various pressure measurement devices, including digital gauges, manometers, and pressure switches, via the provided tubing and adapter.