Dwyer Series 477B Handheld Digital Manometer
Product Introduction
The Dwyer Series 477B Handheld Digital Manometer sets a new standard for portable pressure measurement, offering ±0.1% full-scale accuracy across a range of pressure spans. Battery-powered and designed for field use, this manometer measures positive, negative, or differential pressures in air and compatible gases, making it ideal for HVAC commissioning, industrial maintenance, and precision testing.
Product Features
Exceptional Accuracy:
±0.1% FS at 15.6–25.6°C (60–78°F), ensuring reliable readings in critical applications.
Versatile Measurement Modes:
Positive, negative, and differential pressure measurement with seven selectable units (in. w.c., psi, kPa, mbar, etc.).
Data Management:
Memory storage for 40 readings, hold function, and backlit LCD for low-light environments.
Safety Features:
Visual and audible overpressure alarms to prevent damage during high-pressure scenarios.
Technical Specifications
| Parameter | Detail |
| Model | 477B-1 to 477B-7 (ranges from 0–20 in. w.c. to 0–100 psi) |
| Accuracy | ±0.1% FS (15.6–25.6°C); ±1% FS (0–15.6°C and 25.6–40°C) |
| Media | Air and compatible gases |
| Display | 4-digit LCD (0.425"H x 0.234"W), backlit for visibility |
| Power | 9V alkaline battery (included), typical life: 100+ hours |
| Process Connections | - 1/8" or 3/16" ID barbed fittings (models 477B-1 to 477B-5) |
| - Compression fittings for 1/8" ID x 1/4" OD tubing (models 477B-6 to 477B-7) |
| Temperature Range | Operating: -17.8–60°C (0–140°F); Storage: -20–80°C (-4–176°F) |
| Weight | 10.2 oz (289 g) |
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Dwyer Series 477B Handheld Digital Manometer Images
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