User Manual

Series 477A Digital Manometers are ver-
satile, hand-held, battery operated manome-
ters available in several basic ranges from 0-
20 in. w.c. up to 100 psi. All models measure
either positive, negative or differential pres-
sures with ±0.10% of full scale accuracy. You
can select from up to seven common English
and metric pressure units so conversions are
not necessary. A memory function allows
storage of up to 40 readings for later recall
and a backlight provides auxiliary lighting for
hard-to-see locations. Also standard are a
hold feature plus both visual and audible over-
pressure alarms.
477A-1 0-20.00 in. w.c. 0-4.982 kPa
477A-2 0-40.00 in. w.c. 0-9.96 kPa
477A-3 0-200.0 in. w.c. 0-49.82 kPa
477A-4 0-10.00 psi 0-68.95 kPa
477A-5 0-30.00 psi 0-206.9 kPa
477A-6 0-50.00 psi 0-344.8 kPa
477A-7 0-100.0 psi 0-689.5 kPa
Series 477A Handheld Digital Manometer
Specifications - Installation and Operation Instructions
Bulletin D-26
DWYER INSTRUMENTS, INC. Phone: [phone] www.dwyer-inst.com
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361, U.S.A. Fax: [phone] e-mail: [e-mail]
SPECIFICATIONS
Service: Air and compatible gases.
Wetted Parts: Consult factory.
Accuracy: ±0.10% of full scale from 60 to 78°F
(15.6 to 25.6°C); ±1% of full scale from 32 to 60
and 78 to 104°F (0 to 15 .6 and 25.6 to 40°C).
Pressure Hysteresis: ±0.1% of full scale.
Pressure Limits: See chart.
Temperature Limits: 32 to 104°F (0 to 40°C).
Storage Temperature Limits: -4 to 176°F (-20
to 80°C).
Display: 4-digit LCD (.425˝ H x .234˝ W digits).
Resolution: See chart.
Power Requirements: 9 volt alkaline battery.
Battery included but not connected.
Weight: 10.2 oz. (289 g).
Connections: Two barbed connections for use
with 1/8˝ (3.18 mm) or 3/16˝ (4.76 mm) I.D. tubing
for 477A-1, 477A-2, 477A-3, 477A-4 and 477A-5
only. Two compression fittings for use with 1/8˝
(3.18 mm) I.D. x 1/4˝ (6.35 mm) O.D. tubing for
477A-6 and 477A-7 only.
Available Pressure Units:
477A-1 & 477A-2: psi, in. w.c., mm w.c., in.
Hg, mm Hg, Pa, kPa, bar, mbar
477A-3 & 477A-4: psi, in. w.c., mm w.c., in.
Hg, mm Hg, kPa, bar, mbar
477A-5, 477A-6 & 477A-7: psi, in. w.c., in.
Hg, mm Hg, kPa, bar, mbar
Model
Number
English
Range
Metric
Range
Maximum Pressure
477A-1 3 psi (0.21 bar)
477A-2 3 psi (0.21 bar)
477A-3 15 psi (1.03 bar)
477A-4 30 psi (2.07 bar)
477A-5 60 psi (4.13 bar)
477A-6 100 psi (6.89 bar)
477A-7 200 psi (13.78 bar)
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