Product Description
477AV-2 Water-Column Digital Manometer for HVAC Diagnostics
The Series 477AV Handheld Digital Manometer – Model 477AV-2 is engineered for technicians working in duct-pressure measurement, airflow verification, and system commissioning where inch-of-water-column resolution is critical. Integrated velocity and volumetric-flow calculations remove manual conversions, saving time while improving reporting accuracy.
Built by Dwyer Instruments, the 477AV platform combines rugged aluminum construction with field-adjustable calibration features for dependable performance in mechanical rooms, rooftops, and industrial ventilation systems.
Pressure, Velocity & Flow Measurement Capabilities
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Pressure Range: 0–40 in. w.c.
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Accuracy: ±0.5% FS (60–78°F)
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Velocity Units: fpm, fps, mph, m/s, knot
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Flow Units: cfm, m³/h, m³/s
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Pressure Units: in w.c., psi, Pa, mbar, mm Hg, kPa & more
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Data Storage: 40 readings with min / max / average
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Adjustable zero & span for field calibration
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Damping mode for fluctuating duct readings
Rugged Handheld Construction for Job-Site Use
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Protective aluminum enclosure
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Backlit LCD for dark mechanical spaces
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Compact 10.2 oz portable design
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Dual barbed & compression fittings for tubing connections
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Stores measurement sets internally
HVAC & Ventilation Applications
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Duct static pressure testing
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Air velocity surveys
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Volumetric airflow verification
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System diagnostics
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Commissioning & troubleshooting
Environmental & Electrical Specifications
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Service: Air & compatible gases
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Operating Temp: 0–140°F
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Compensated Range: 32–104°F
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Power: 9V alkaline battery
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Approvals: CE
