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Series 477AV Handheld Digital Manometer
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BARBED FOR
Specications - Installation and Operating Instructions
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Bulletin TE-477AV-1
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ID TUBING
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The Series 477AV Handheld Digital Manometer is available with pressure, ow,
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, ow, and velocity
there are selectable English and metric units, as seen in the model chart below. The
built-in air velocity and volumetric ow 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 airow 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 eld-calibrated by setting zero & span values. Furthermore, the damping
feature compensates for the uctuating readings by averaging input values to display
a more stable readout. Included is an audible and visual alarm to warn over ow, over
pressure or over velocity.
MODEL CHART
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 to 1.000 in w.c.
0 to 4.000 in w.c.
0 to 10.00 in w.c.
0 to 20.00 in w.c.
0 to 40.00 in w.c.
0 to 200.0 in w.c.
0 to 10.00 psi
0 to 20.00 psi
0 to 30.00 psi
0 to 100.0 psi
0 to 150.0 psi
Velocity Range Available Pressure Units
4004
20.34
-
0.0736
8009
12.66k
17.91k
25.33k
56.63k
66.62k
94.22k
115.4k
210.7k
258.0k
40.69
64.33
90.97
128.7
287.7
338.4
478.6
586.2
1070
1311
0.1445
0.3613
0.7225
1.445
7.225
10.00
20.00
30.00
100.0
150.0
0.2942
0.7355
1.471
2.942
14.71
20.36
40.72
61.08
203.6
305.4
0.2491
0.996
2.491
4.982
9.96
49.82
68.95
137.9
206.9
689.5
1034
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 mbar
1.868
7.473
18.68
37.36
74.73
373.6
517.1
1034
1551
5171
7757
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% FS.
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.
mm
w.c. Pa ft w.c. oz/in
2.491
25.40
101.6
254.0
508.0
1016
5080
7031
-
-
-
-
249.1
996
2491
4982
9964
-
-
-
-
-
-
9.96
24.91
49.82
99.6
498.2
689.5
1379
2069
6895
-
0.0833
0.3333
0.8333
1.667
3.333
16.67
13.07
46.13
69.20
230.7
346.0
2
0.5780
2.312
5.780
11.56
23.12
115.6
160.0
320.0
480.0
1600
2400
Units of Pressure: in w.c., ft w.c., in Hg,
2
, mm w.c., cm w.c., mm Hg,
psi, oz/in
mbar, Pa, kPa, hPa.
Units of Velocity: fpm, fps, mph, m/h,
m/s, k/h, knot.
Units of Flow: cfm, m
Power Requirements: 9 V alkaline
battery, installed non-functional, user
replaceable.
Process Connections: Two barbed
connections for use with 1/8˝ (3.18
mm) or 3/16˝ (4.76 mm) ID tubing. Two
compression ttings for use with 1/8˝
(3.18 mm) ID x 1/4˝ (6.35 mm) OD tubing
for 477AV-7 and 477AV-8 only.
Weight: 10.2 oz (289 g).
Compliance: CE.
Maximum
cm
w.c.
2.540
10.16
25.40
50.80
101.6
508.0
703.1
1406
2109
7031
-
Pressurefpm m/s psi in Hg kPa
5 psig
5 psig
5 psig
10 psig
10 psig
30 psig
30 psig
60 psig
60 psig
150 psig
200 psig
hPa
2.491
9.964
24.91
49.82
99.64
498.2
689.5
1379
2068
6895
-
3
/h, m3/s.
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 ow mode, then velocity or ow will be displayed instead. The
mode selection will persist even after the instrument is turned off. In velocity and ow
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.
DWYER INSTRUMENTS, INC.
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A.
Phone: 219-879-8000
Fax: 219-872-9057
www.dwyer-inst.com
e-mail: info@dwyermail.com
Page 2
Battery Installation
The unit is shipped with a 9 V alkaline battery which must be installed before operation.
When battery replacement becomes necessary, use only a 9 V alkaline type such
as Duracell
®
MN1604, Eveready® 522 or equivalent. Zinc-carbon types, often labeled
heavy-duty are not recommended because of the increased potential for leakage.
Alkaline batteries also offer a better value since they last up to three times longer in
this device. To install the batteries:
1. Remove the two screws holding the bottom end-cap (marked BATTERY) in place.
2. Connect the battery to the enclosed battery clip observing correct polarity. Be
careful not to trap wires between the battery, case, or foam pads which retain
the battery. This could make it difcult to install the battery or remove it later for
replacement.
3. Be sure the rubber gasket is properly seated in the gasket channel of the end-cap.
Notice that the end-cap will only t one way because the holes are slightly off
center.
4. Place the “z” shaped wrist strap clip in one of the screw recesses and tighten the
screws. Do not over-tighten.
5. Attach wrist strap to the clip.
On/Off Power
Pressing and holding the ON/OFF button will turn the unit on or off.
Zeroing Readings
The 477AV is calibrated at the factory, but users are recommended to zero the
instrument before each use. To set a new zero point, press and hold the ZERO button
with both ports vented to atmospheric pressure. This setting can be cleared only by
a factory default.
Display Backlight
The 477AV has a display backlight to be used in the dark or in poor lighting conditions.
It can be turned on or off by pressing and holding the MENU and ENTER buttons at the
same time. The backlight setting is not saved after the 477AV is turned off.
Display Hold
To hold or freeze a value, press and hold down the HOLD button. When the Hold
function is enabled, the pressure/velocity/ow reading will not change, and the unit of
measure will toggle with the word “HOLD”. If the Store function is used when Hold is
enabled, the reading on the display (not the actual reading) will be stored. This function
cannot be used when a menu is being displayed.
Figure 1
Pressure Connectors
The 477AV has two barbed connector ports for use with 1/8˝ (3.18 mm) or 3/16˝ (4.76
mm) I.D. tubing.
• For a single positive pressure, remove the end caps from the connectors and
connect the tubing to the port marked “+” and vent the opposite port to atmosphere.
• For a single negative pressure (vacuum), connect the tubing to port marked “–” and
vent the opposite port to atmosphere.
• To measure differential pressure, connect higher pressure to port marked “+” and
lower pressure to port marked “-”. Manometer will indicate the difference between
the two ports. Velocity and volumetric ow can be found similarly if that is the
current mode.
Buttons and Menus
The 477AV’s menu is controlled with four buttons labeled MENU, UP, DOWN, and
ENTER. The buttons are shown in Figure 2.
Figure 2: 477AV manometer
Storing Readings
Pressing and holding the STORE button will store a reading in the memory. The display
will ash “MEM” and the reading’s memory location (e.g. “MEM” and “5”). The 477AV
has the ability to store up to 40 readings in the memory. Readings that are saved will
remain in memory even if the unit is powered off. If the Hold function is enabled, then
the stored value will be the value on the display (not the actual reading).
Measurement Mode
The 477AV can be set to display pressure, velocity, or volumetric ow. The mode can
be changed by pressing and holding the HOLD and STORE buttons simultaneously.
Once a mode is selected, the menu will continue to prompt for unit of measurement,
K-factor, duct shape and duct size when applicable. Duct size and shape are input in
inches or centimeters, depending on whether the primary unit of measure is metric or
English. Settings for all modes are retained in the memory even if the mode is changed
or the 477AV is turned off.
The mode cannot be changed if there are readings saved in memory, or if the Hold
feature is on. (This prevents a user from accidentally saving readings with different
units of measure.) If a user tries to access the mode submenu when readings are
saved, the display will ash “ERR Log”. If a user tries to access the mode submenu
when the Hold feature is active, the display will ash “ERR Hold”.
1. Press and hold the UP and DOWN arrows simultaneously.
2. Using the UP and DOWN arrows, nd the mode (velocity, pressure, or ow) you
want.
3. Press ENTER to conrm the desired mode.
4. The display will prompt for units of measurement. Scroll through the options with
the UP and DOWN arrows until the unit of choice is found.
5. Press ENTER.
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Advanced Menu
In addition to the features accessible directly from the buttons, there is an advanced
menu that allows access to stored values in memory, mode of operation, digital
dampening, measurement statistics, calibration, power saving, audible alarm, and
factory defaulting the device. The complete diagram of the advanced menu can be
found on the last page of this instruction manual or the back of the unit.
Statistics
Minimum and maximum readings can be viewed in the “STAT” submenu. While they
are being viewed, the unit of measure will toggle with the word “MIN” or “MAX”. The
minimum and maximum values can be reset by pressing and holding the ENTER
button when viewing the values. They are also reset when the 477AV is turned off,
and when the mode of operation is changed. Here are the steps to get to minimum
and maximum values.
1. Press MENU.
2. Scroll down to STAT and press ENTER.
3. Scroll to view the minimum and maximum values.
1. Press and release the MENU button to access the advanced menu.
2. Use the UP and DOWN arrow buttons to cycle through the menu options.
3. Press ENTER once the desired option is selected.
4. Use the UP and DOWN arrow buttons to make changes to that option.
5. Press ENTER to save the changes.
6. Press MENU button to return to the menu or home screen.
Memory (MEM)
Saved readings can be viewed by pressing MENU and then ENTER. There will be two
options: “LOG” and “AVG”.
“LOG” shows saved readings in the order they were stored. “AVG” displays the
average value of the saved readings and is updated based on the content of the log
les. Empty memory locations are not shown. If no readings have been stored, the
display will read “----”. When the memory is full, the display will ash “ERR FULL”
and discard the reading. A reading cannot be stored when a menu is being displayed.
Erasing Stored Readings
Stored readings can be erased using the menu.
1. Press MENU and MEM will be displayed.
2. Press ENTER.
3. Press ENTER as “LOG” is displayed on top of the screen.
4. Scroll using the UP and DOWN arrows to the value you wish to erase (or any
if you want to erase all).
5. Press ENTER.
6. This will take you to the “Erase” submenu. The “Erase” submenu has three
options; “no” will do nothing, “OnE” will erase the most recently viewed reading,
and “ALL” will erase all stored readings.
It should be noted that the measurement mode cannot be changed unless the memory
values are erased. (This prevents a user from accidently saving readings with different
units of measure.)
Changing Measurement Mode
Besides changing the measurement mode using the front buttons, it can also
be changed in the menu. The 477AV can be set to display pressure, velocity, or
volumetric ow. Once a mode is selected, the menu will continue to prompt for unit
of measurement, K-factor, duct shape and duct size when applicable. Duct size and
shape are input in inches or centimeters, depending on whether the primary unit of
measure is metric or standard. Settings for all modes are retained in the memory even
if the mode is changed or the 477AV is turned off.
Calibration
If the measurements are not reading within specications compared to a calibrated
reference, the zero and span values can be adjusted in the calibration menu. When
zero calibration is preformed, both ports should be vented to atmospheric pressure.
When span calibration is performed, positive pressure equivalent to the max end of
the factory pressure range should be applied to the positive pressure port with the
negative port vented to atmospheric pressure. This setting can be cleared by a factory
default.
1. Press MENU and MEM will be displayed.
2. Press DOWN arrow until CAL is displayed.
3. Press ENTER.
4. Vent the pressure ports to atmospheric pressure.
5. Press and hold ENTER.
6. Press DOWN arrow.
7. Apply pressure to the positive pressure port.
8. Press and hold ENTER.
Auto Power Off
The 477AV will turn off if no key is pressed for a set amount of time. The default time
is 20 minutes, but may be changed using the menu to any value from 1 to 20 minutes,
or disabled. Here are the steps.
1. Press MENU.
2. Scroll with the UP and DOWN arrows to “OFF” option and press ENTER.
3. Using the UP and DOWN arrows, select a minute value for the auto-shut off.
4. Press ENTER to lock in that value.
5. Press MENU twice to return to the main screen.
Sound
The 477AV can be set to beep during button presses. This feature can be turned on or
off using the “BEEP” menu option. Here are the steps.
1. Press MENU.
2. Scroll down to the “BEEP” menu option and press ENTER.
3. Using the UP and DOWN arrows, select “ON” or “OFF” and press ENTER.
Factory Default
The 477AV can be reset to factory conditions using the menu’s “RSET” option. This
will reset all settings, including a zero or span. Here are the steps.
1. Press MENU.
2. Scroll using the UP and DOWN arrows to “RSET” and press ENTER.
3. Scroll down to “YES” and press ENTER.
The mode cannot be changed if there are readings saved in memory, or if the Hold
feature is on. (This prevents a user from accidentally saving readings with different
units of measure.) If a user tries to access the mode submenu when readings are
saved, the display will ash “ERR Log”. If a user tries to access the mode submenu
when the Hold feature is active, the display will ash “ERR Hold”.
1. Press MENU and MEM will be displayed.
2. Press DOWN arrow and MODE will be displayed.
3. Press ENTER.
4. Using the UP and DOWN arrows, nd the mode (velocity, pressure, or ow) you
want.
5. Press ENTER to conrm the desired mode.
6. The display will prompt for units of measurement. Scroll through the options
with the UP and DOWN arrows until the unit of choice is found.
7. Press ENTER.
Damping Function
The “DAMP” submenu compensates for the uctuating readings by averaging input
values to display a more stable readout. The damping value can be set to any number
between 1 to 9. The default value is set to 4. Here are the steps to change the damp
value.
1. Press MENU.
2. Scroll using the UP and DOWN arrows to select “DAMP” and press ENTER.
3. Using the UP and DOWN arrows, choose a number in the range of 1 to 9 and
press ENTER.
Over Pressure/Under Pressure Alarm
If over pressure or under pressure is applied to the unit, “OvFL” or “UnFL” will display
respectively and an audible alarm will sound. The threshold is ±10% of the 477AV’s
range. Do not exceed the maximum rated pressure of this manometer; doing so could
cause a permanent damage to the sensor, rupture the housing, and/or cause injury.
Battery Monitor
The 477AV monitors its battery voltage whenever it’s powered on. If the voltage is low,
the “LOW BAT” icon will appear on the display. A weak battery can cause inaccurate
measurements. It is recommended to replace the battery as soon as possible to ensure
top functionality. Do not leave an exhausted battery in the unit due to potential leakage.
Maintenance
The Series 477AV Handheld Digital Manometer is not eld serviceable and should
be returned if repair is needed (eld repair should not be attempted and may void
warranty). Be sure to include a brief description of the problem plus any relevant
application notes. Contact customer service to receive a return goods authorization
number before shipping.
Page 4
PRESS AND HOLD THE ENTER
BUTTON TO SET ZERO OR SPAN.
PRESS AND HOLD THE ENTER
BUTTON TO RESET TO FACTORY DEFAULTS.
Figure 3: 477AV menu options
Printed in U.S.A. 1/22 FR# 444250-00 Rev. 3©Copyright 2022 Dwyer Instruments, Inc.
Eveready
®
Duracell
®
is a registered trademark of Eveready Battery Company, Inc.
is a registered trademark of The Gillette company.
DWYER INSTRUMENTS, INC.
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A.
Phone: 219-879-8000
Fax: 219-872-9057
www.dwyer-inst.com
e-mail: info@dwyermail.com
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