
Dwyer Instruments A-331 Filter Vent Plug
The Dwyer Instruments A-331 is a professional-grade 1/8" NPT filter vent plug engineered to protect sensitive pneumatic equipment from intake contaminants. Constructed with a durable nylon body and a sintered metal filter, this component is essential for maintaining the integrity of differential pressure gauges, such as the Magnehelic and Capsuhelic series, in high-dust or industrial environments. The porous sintered metal element provides excellent airflow resistance balance, allowing for accurate atmospheric pressure referencing while effectively blocking airborne particulates that can cause internal fouling or drift in precision instruments.
Specifically designed for HVAC ventilation monitoring and industrial pressure sensing, the A-331 replaces standard plugs in applications where filtered venting is non-negotiable. Its 1/8" NPT male connection ensures a secure, leak-free fit into gauge ports or manifold blocks. Whether you are managing cleanroom applications or heavy-duty exhaust systems, this filter vent plug prevents debris from entering the high or low-pressure sides of your sensors, extending the service life of your differential pressure measurement hardware by maintaining a clean internal pneumatic circuit.
Key Benefits- Contamination Prevention: High-efficiency sintered metal filter stops airborne dust and fine particulates from entering sensitive gauge internals.
- Corrosion Resistance: Robust nylon construction stands up to demanding industrial atmospheres and chemical exposure.
- Versatile Application: Standard 1/8" NPT threads provide universal compatibility with most Dwyer differential pressure gauges and transmitters.
- Pneumatic Protection: Ideal for use as an exhaust muffler or intake vent to reduce noise and prevent blockage in diaphragm valves.
- Can this be used on the Magnehelic series? Yes, it is the standard accessory for venting Magnehelic gauges to the atmosphere in dusty environments.
- What is the maximum pressure rating? This plug is designed primarily for venting and atmospheric referencing; it should be used within the operating limits of the connected instrument.
- Is the filter element cleanable? While some technicians use compressed air for light cleaning, standard practice is replacement to ensure consistent airflow and filtration.
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.
Dwyer Instruments A-331 Filter Vent Plug
The Dwyer Instruments A-331 is a professional-grade 1/8" NPT filter vent plug engineered to protect sensitive pneumatic equipment from intake contaminants. Constructed with a durable nylon body and a sintered metal filter, this component is essential for maintaining the integrity of differential pressure gauges, such as the Magnehelic and Capsuhelic series, in high-dust or industrial environments. The porous sintered metal element provides excellent airflow resistance balance, allowing for accurate atmospheric pressure referencing while effectively blocking airborne particulates that can cause internal fouling or drift in precision instruments.
Specifically designed for HVAC ventilation monitoring and industrial pressure sensing, the A-331 replaces standard plugs in applications where filtered venting is non-negotiable. Its 1/8" NPT male connection ensures a secure, leak-free fit into gauge ports or manifold blocks. Whether you are managing cleanroom applications or heavy-duty exhaust systems, this filter vent plug prevents debris from entering the high or low-pressure sides of your sensors, extending the service life of your differential pressure measurement hardware by maintaining a clean internal pneumatic circuit.
Key Benefits- Contamination Prevention: High-efficiency sintered metal filter stops airborne dust and fine particulates from entering sensitive gauge internals.
- Corrosion Resistance: Robust nylon construction stands up to demanding industrial atmospheres and chemical exposure.
- Versatile Application: Standard 1/8" NPT threads provide universal compatibility with most Dwyer differential pressure gauges and transmitters.
- Pneumatic Protection: Ideal for use as an exhaust muffler or intake vent to reduce noise and prevent blockage in diaphragm valves.
- Can this be used on the Magnehelic series? Yes, it is the standard accessory for venting Magnehelic gauges to the atmosphere in dusty environments.
- What is the maximum pressure rating? This plug is designed primarily for venting and atmospheric referencing; it should be used within the operating limits of the connected instrument.
- Is the filter element cleanable? While some technicians use compressed air for light cleaning, standard practice is replacement to ensure consistent airflow and filtration.
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.
Product Information
Product Information
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Description
The Dwyer Instruments A-331 is a professional-grade 1/8" NPT filter vent plug engineered to protect sensitive pneumatic equipment from intake contaminants. Constructed with a durable nylon body and a sintered metal filter, this component is essential for maintaining the integrity of differential pressure gauges, such as the Magnehelic and Capsuhelic series, in high-dust or industrial environments. The porous sintered metal element provides excellent airflow resistance balance, allowing for accurate atmospheric pressure referencing while effectively blocking airborne particulates that can cause internal fouling or drift in precision instruments.
Specifically designed for HVAC ventilation monitoring and industrial pressure sensing, the A-331 replaces standard plugs in applications where filtered venting is non-negotiable. Its 1/8" NPT male connection ensures a secure, leak-free fit into gauge ports or manifold blocks. Whether you are managing cleanroom applications or heavy-duty exhaust systems, this filter vent plug prevents debris from entering the high or low-pressure sides of your sensors, extending the service life of your differential pressure measurement hardware by maintaining a clean internal pneumatic circuit.
Key Benefits- Contamination Prevention: High-efficiency sintered metal filter stops airborne dust and fine particulates from entering sensitive gauge internals.
- Corrosion Resistance: Robust nylon construction stands up to demanding industrial atmospheres and chemical exposure.
- Versatile Application: Standard 1/8" NPT threads provide universal compatibility with most Dwyer differential pressure gauges and transmitters.
- Pneumatic Protection: Ideal for use as an exhaust muffler or intake vent to reduce noise and prevent blockage in diaphragm valves.
- Can this be used on the Magnehelic series? Yes, it is the standard accessory for venting Magnehelic gauges to the atmosphere in dusty environments.
- What is the maximum pressure rating? This plug is designed primarily for venting and atmospheric referencing; it should be used within the operating limits of the connected instrument.
- Is the filter element cleanable? While some technicians use compressed air for light cleaning, standard practice is replacement to ensure consistent airflow and filtration.
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.











