Product Description
477AV-1 Low-Range Water-Column Digital Manometer for HVAC Diagnostics
The Series 477AV Handheld Digital Manometer – Model 477AV-1 is built for technicians verifying duct static pressure, airflow distribution, and ventilation performance in low-pressure HVAC systems. Integrated velocity and volumetric-flow calculations remove manual conversions, accelerating commissioning while improving reporting confidence.
Developed by Dwyer Instruments, the 477AV platform pairs rugged aluminum construction with field-adjustable calibration features for dependable performance in mechanical rooms, rooftops, and industrial facilities.
Pressure, Velocity & Flow Measurement Capabilities
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Pressure Range: 0–20 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 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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Internal memory for job documentation
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
