Send a part number, a photo, or a whole BOM — we supply it and stand behind it. Worldwide shipping to 80+ countries.

Dwyer Digital pressure gauge 0-500Mbar Dwyer 477AV-3 - Measurement
DwyerMeasurement

Dwyer Digital pressure gauge 0-500Mbar Dwyer 477AV-3

Dwyer 477AV-3 is a digital pressure gauge measuring air and compatible gases from 0–500 mbar with ±0.5% FS accuracy. Operating range spans 0 to 140°F, storing up to 40 readings. Ideal for HVAC, pneumatic systems, and…

SKU 3G-CBM-04574

Also listed as: MES 25003 · MES-25003

Brand
Dwyer
Item
Digital pressure gauge 0-500Mbar Dwyer 477AV-3
Category
Measurement
UNSPSC
41112412 — Pressure gauge
Available to Order
Trade pricing by quote — replies within 24h
Qty
WhatsApp an engineerMessage via Telegram
No account needed — your quote request goes straight to our engineers. A free account lets you track quotes and re-order faster.
Worldwide Shipping
Air & sea freight
Datasheet on Request
Technical specs
1-Day Quote
Replies within 24h

Local availability & support — Singapore

Local office
20 Woodlands Link #09-05, Singapore 738733
Phone
+65 8878 8355
Delivery
Same-day or next-business-day delivery within Singapore for in-stock items; 7–14 days for factory-order parts from Europe.
Payment
Invoicing in SGD. PayNow, bank transfer, and corporate PO accepted.
Ships to
Singapore

Technical Specifications

Dwyer
service
air and compatible gases
accuracy
±0.5% FS
pressure range
0-500 mbar
units pressure
in w.c., ft w.c., in Hg, psi, oz/in2, mm w.c., cm w.c., mm Hg, mbar, Pa, kPa, hPa
storage capacity
40 readings
temperature operating
0 to 140°F (-17.8 to 60°C)
temperature compensated
32 to 104°F (0 to 40°C)

Datasheet Content

TEST & DATA SERIES 477AV HANDHELD DIGITAL MANOMETER Measures Pressure, Flow and Velocity; ±0.5% Accuracy 2-13/16 [71.44] 1-1/16 [26.99] 41/64 [16.27] BARBED FOR 1/8 OR 3/16 ID TUBING 5-57/64 [149.68] VIDEO ON LINE 29/32 [23.02] The Series 477AV Handheld Digital Manometer is now available with pressure, flow, SPECIFICATIONS and velocity measurements along with a number of other convenient features. The Service: Air and compatible gases. Units of Pressure: in w.c., ft w.c., in Hg, built-in air velocity and flow calculations provide accuracy and conserve time and error Wetted Materials: Consult factory. psi, oz/in2, mm w.c., cm w.c., mm Hg, associated with manual calculations. Also featured on this unit are adjustable zero and Accuracy: ±0.5% FS, 60 to 78°F (15.6 mbar, Pa, kPa, hPa. span values for calibrating in the field, as well as a damping feature to compensate for to 25.6°C); ±1.5% FS from 32 to 60°F Units of Velocity: fpm, fps, mph, m/h, the fluctuating of readings. and 78 to 104°F (0 to 15.6°C and 25.6 m/s, k/h, knot. to 40.0°C). Units of Flow: cfm, m3/h, m3/s. FEATURES/BENEFITS Pressure Hysteresis: ±0.1% FS. Power Requirements: 9 V alkaline • Calculates and displays air velocity and volumetric air flow Pressure Limits: See chart. battery, installed non-functional, user • Rugged aluminum case protects instrument from damage during transport/use Temperature Limits: 0 to 140°F (-17.8 replaceable. • 9 selectable English and metric engineering units to 60°C). Weight: 10.2 oz (289 g). • Large, easy to read display with backlight for use in dark areas Compensated Temperature Limits: 32 Process Connections: Two barbed • Stores up to 40 readings with minimum, maximum and average statistics to 104°F (0 to 40°C). connections for use with 1/8˝ (3.18 Storage Temperature Limits: -4 to mm) or 3/16˝ (4.76 mm) ID tubing. Two Manometers, APPLICATIONS 176°F (-20 to 80°C). compression fittings for use with 1/8˝ • Air flow monitoring Display: 0.42˝ (10.6 mm) 4 digit LCD. (3.18 mm) ID x 1/4˝ (6.35 mm) OD tubing Portable • Duct static pressure Resolution: See chart. for 477AV-7 and 477AV-8 only. Agency Approvals: CE. MODEL CHART Velocity Range Available Pressure Units Pressure in mm mm cm Maximum Model Range fpm m/s psi in Hg kPa w.c. Hg mbar w.c. Pa ft w.c. oz/in2 hPa w.c. Pressure 477AV-000 0 to 1.000 in w.c. 4004 20.34 - 0.0736 0.2491 1.000 1.868 2.491 25.40 249.1 0.0833 0.5780 2.491 2.540 5 psig 477AV-00 0 to 4.000 in w.c. 8009 40.69 0.1445 0.2942 0.996 4.000 7.473 9.96 101.6 996 0.3333 2.312 9.964 10.16 5 psig 477AV-0 0 to 10.00 in w.c. 1.266k 64.33 0.3613 0.7355 2.491 10.00 18.68 24.91 254.0 2491 0.8333 5.780 24.91 25.40 5 psig 477AV-1 0 to 20.00 in w.c. 1.791k 90.97 0.7225 1.471 4.982 20.00 37.36 49.82 508.0 4982 1.667 11.56 49.82 50.80 10 psig 477AV-2 0 to 40.00 in w.c. 25.33k 128.7 1.445 2.942 9.96 40.00 74.73 99.6 1016 9964 3.333 23.12 99.64 101.6 10 psig 477AV-3 0 to 200.0 in w.c. 56.63k 287.7 7.225 14.71 49.82 200.0 373.6 498.2 5080 - 16.67 115.6 498.2 508.0 30 psig 477AV-4 0 to 10.00 psi 66.62k 338.4 10.00 20.36 68.95 276.8 517.1 689.5 7031 - 13.07 160.0 689.5 703.1 30 psig 477AV-5 0 to 20.00 psi 94.22k 478.6 20.00 40.72 137.9 553.6 1034 1379 - - 46.13 320.0 1379 1406 60 psig 477AV-6 0 to 30.00 psi 115.4k 586.2 30.00 61.08 206.9 830.4 1551 2069 - - 69.20 480.0 2068 2109 60 psig 477AV-7 0 to 100.0 psi 210.7k 1070 100.0 203.6 689.5 2768 5171 6895 - - 230.7 1600 6895 7031 150 psig 477AV-8 0 to 150.0 psi 258.0k 1311 150.0 305.4 1034 4152 7757 - - - 346.0 2400 - - 200 psig OPTIONS To order add suffix: Description -NIST NIST traceable calibration certificate Example: 477AV-1-NIST ACCESSORIES Model Description A-402A Carrying case; tough gray nylon pouch protects any Series 477AV Manometer; double zippered for quick and easy access, with a belt loop that snaps closed; 7-1/2˝H x 3˝W x 2-1/4˝D (191 x 76 x 57 mm) UHH-C1 Soft carrying case A-402A UHH-C1 A-47X-BOOT A-47X-BOOT Protective magnetic rubber boot (manometer not included) DWYER INSTRUMENTS, INC. | dwyer-inst.com 171 TestData_2021.indb 171 7/15/20 2:11 PM

Technical Documents

(1)
Not sure this is the right part? Get a recommendation.

Need installation or engineering help?

Installation, commissioning, maintenance plans, system design, and bundled product + service quotes — one team handles the full scope.
Talk to an engineer

Ask a question

Dwyer Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

Dwyer 477AV-3 is a digital pressure gauge measuring air and compatible gases from 0–500 mbar with ±0.5% FS accuracy. Operating range spans 0 to 140°F, storing up to 40 readings. Ideal for HVAC, pneumatic systems, and industrial gas applications requiring portable pressure monitoring.

Frequently Asked Questions

What is the Dwyer 477AV-3 digital pressure gauge used for?

The Dwyer 477AV-3 is a handheld digital manometer used for measuring pressure, air flow, and velocity in HVAC systems, pneumatic lines, and industrial gas applications. It calculates volumetric flow and velocity, making it suitable for duct static pressure checks and air flow monitoring in commercial and industrial settings.

What are the specifications of the Dwyer 477AV-3?

The Dwyer 477AV-3 measures 0–500 mbar with ±0.5% FS accuracy (60–78°F). It operates from 0 to 140°F and stores up to 40 readings. Units include in w.c., psi, mbar, Pa, and kPa. It uses a 9 V alkaline battery and has barbed connections for 1/8 or 3/16 inch ID tubing.

Where to buy the Dwyer 477AV-3 in Singapore?

You can source the Dwyer 477AV-3 digital pressure gauge through 3G Electric in Singapore. We handle logistics, customs clearance, and delivery to your facility. Contact us for pricing and lead time on this measurement instrument.

How to use the Dwyer 477AV-3 for air flow measurement?

To measure air flow with the Dwyer 477AV-3, connect the barbed fittings to 1/8 or 3/16 inch ID tubing and select the desired flow unit (cfm, m³/h, or m³/s). The gauge calculates volumetric flow and velocity automatically. Use the backlit display for low-light areas and the damping feature to stabilize fluctuating readings.

Used in

Common applications for Dwyer
Combustion air-filter monitoring — Magnehelic Series 2000 on burner air-intake filter banks
Clean-room and pharmaceutical pressurisation — Magnehelic / Capsuhelic differential-pressure gauges
HVAC fan-discharge static pressure — Mark II inclined-vertical manometers on AHU test points
Filter-blockage alarms — Photohelic Series 3000 combined gauge/switch on air-handling units
BMS-integrated pressure monitoring — Digihelic DH3 with 4–20 mA output for building management

Dwyer Products

3G Electric supplies Dwyer measurement. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

You might also need

Burners & Combustion Pumps & Compressors Spare Parts All Products

Compatible alternatives & equivalents

Cross-referenced by specification & description
Digital pressure gauge 0-100Mbar Dwyer 477AV-2
Dwyer
Digital pressure gauge 0-100Mbar Dwyer 477AV-2
Magnehelic pressure gauge 2000-250PA
Dwyer
Magnehelic pressure gauge 2000-250PA
Magnehelic 2000-10KPA pressure gauge
Dwyer
Magnehelic 2000-10KPA pressure gauge
Magnehelic 2000-300PA pressure gauge
Dwyer
Magnehelic 2000-300PA pressure gauge
Magnehelic pressure gauge 2000-750PA
Dwyer
Magnehelic pressure gauge 2000-750PA
Magnehelic pressure gauge 2000-2KPA
Dwyer
Magnehelic pressure gauge 2000-2KPA

More from Dwyer

View all Dwyer parts
Magnehelic pressure gauge 2000-30PA
Dwyer
Magnehelic pressure gauge 2000-30PA
Flow meter FS 2
Dwyer
Flow meter FS 2
Dwyer
Dwyer
Average flow probe PAFS-1002
Dwyer
Dwyer
MAFS-48 metallic average flow probe
Dwyer
Dwyer
Transmitter 645-6
Dwyer
Dwyer
Current detector SCS-211125-R
Dwyer
Dwyer
Current transmitter SCT10-102
Dwyer
Dwyer
Current transmitter CCT 50-203