Series 477AV Handheld Digital Manometer
Specifications - Installation and Operating Instructions
Bulletin TE-477AV-1
DWYER INSTRUMENTS, INC.
Model
477AV-000
477AV-00
477AV-0
477AV-1
477AV-2
477AV-3
477AV-4
477AV-5
477AV-6
477AV-7
477AV-8
Pressure Range
0-1.000 in w.c.
0-4.000 in w.c.
0-10.00 in w.c.
0-20.00 in w.c.
0-40.00 in w.c.
0-200.0 in w.c.
0-10.00 psi
0-20.00 psi
0-30.00 psi
0-100.0 psi
0-150.0 psi
fpm
0-4004
0-8009
0-1.266k
0-1.791k
0-1.791k
0-56.63k
0-66.62k
0-94.22k
0-115.4k
0-210.7k
0-258.0k
m/s
20.34
40.69
64.33
90.97
128.7
287.7
338.4
478.6
586.2
1070
1311
The
Series 477AV Handheld Digital Manometer
is available with pressure, flow, and
velocity measurements along with a number of other features. The 477AV uses a highly
accurate differential pressure sensor to offer ± 0.5% full scale accuracy. It displays
negative, positive, and differential pressure. For pressure, flow, and velocity there are
selectable English and metric units, as seen in the model chart below. The built-in air
velocity and volumetric flow calculations conserve time associated with cumbersome
manual calculations. Additionally, up to 40 readings can be saved—perfect for HVAC
technicians making Pitot tube traverses of airflow readings across a duct. The accuracy
that the 477AV Series provides is critical to maintenance personnel and technicians
who require a highly accurate standard to check their instrumentation or equipment, to
ensure proper performance.
The digital display offers a backlight feature for easier viewing in darker areas.
Meanwhile, battery conservation is monitored and displayed in the event of low battery
condition. The digital manometer will automatically shut off after 20 minutes to prevent
battery drain. This shut-off time can be reduced or disabled if desired. Series 477AV
can be field-calibrated by setting zero & span values. Furthermore, the damping feature
compensates for the fluctuating readings by averaging input values to display a more
stable readout. Included is an audible and visual alarm to warn over flow, over pressure
or over velocity.
SPECIFICATIONS
Service:
Air and compatible gases.
Wetted Materials:
Consult factory.
Accuracy:
±0.5% FS, 60 to 78°F
(15.6 to 25.6°C); ±1.5% FS from 32 to
60°F and 78 to 104°F (0 to 15.6°C
and 25.6 to 40.0°C).
Pressure Hysteresis:
±0.1% of full-
scale.
Pressure Limits:
See chart.
Temperature Limits:
0 to 140°F
(-17.8 to 60°C).
Compensated Temperature Limits:
32 to 104°F (0 to 40°C).
Storage Temperature Limits:
-4 to
176°F (-20 to 80°C).
Display:
0.42˝ (10.6 mm) 4 digit LCD.
Resolution:
See chart.
Units of Pressure:
in w.c., ft. w.c., in
Hg, psi, oz/in
2
, mm w.c., cm w.c., mm
Hg, mbar, Pa, kPa, hPa.
Units of Velocity:
fpm, fps, mph, m/h,
m/s, k/h, knot.
Units of Flow:
cfm, m3/h, m3/s.
Power Requirements:
9 V Alkaline
battery, installed non-functional, user
replaceable.
Weight:
10.2 oz (289 g).
Process Connections:
Two barbed
connections for use with 1/8˝ (3.18
mm) or 3/16˝ (4.76 mm) ID tubing.
Two compression fittings for use with
1/8˝ (3.18 mm) ID x 1/4˝ (6.35 mm)
OD tubing for 477AV-7 and 477AV-8
only.
Agency Approvals:
CE.
kPa
0.2491
0.996
2.491
4.982
9.96
49.82
68.95
137.9
206.9
689.5
1034
psi
0.1445
0.3613
0.7225
1.445
7.225
10.00
20.00
30.00
100.0
150.0
in Hg
0.0736
0.2942
0.7355
1.471
2.942
14.71
20.36
40.72
61.08
203.6
305.4
in w.c.
1.000
4.000
10.00
20.00
40.00
200.0
276.8
553.6
830.4
2768
4152
mm Hg
1.868
7.473
18.68
37.36
74.73
373.6
517.1
1034
1551
5171
7757
mbar
2.491
9.96
24.91
49.82
99.6
498.2
689.5
1379
2069
6895
mm w.c.
25.40
101.6
254.0
508.0
1016
5080
7031
Pa
249.1
996
2491
4982
9964
ft w.c.
0.0833
0.3333
0.8333
1.667
3.333
16.67
13.07
46.13
69.20
230.7
346.0
oz/in
2
0.5780
2.312
5.780
11.56
23.12
115.6
160.0
320.0
480.0
1600
2400
hPa
2.491
9.964
24.91
49.82
99.64
498.2
689.5
1379
2068
6895
cm w.c.
2.540
10.16
25.40
50.80
101.6
508.0
703.1
1406
2109
7031
Velocity Range Available Pressure Units
Maximum
Pressure
5 psig
5 psig
5 psig
10 psig
10 psig
30 psig
30 psig
60 psig
60 psig
150 psig
200 psig
29/32
[23.02]
5-57/64
[149.68]
41/64
[16.27]
2-13/16 [71.44]
1-1/16
[26.99]
BARBED FOR
1/8 OR 3/16
ID TUBING
Displaying Pressure, Velocity, and Flow
The instrument measures pressure using a piezoelectric sensor. When the 477AV
is powered on the pressure value and the unit of measurement will be shown. If
you select the velocity or flow mode, then velocity or flow will be displayed instead.
The mode selection will persist even after the instrument is turned off. In velocity
and flow modes, if the reading exceeds 9,999, then a “K” will be displayed next to
the unit of measurement and the display will read in units of 1,000 times the original
unit of measurement.
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