Dwyer 477B Series Handheld Digital Manometer Instructions
- June 10, 2024
- Dwyer
Table of Contents
Dwyer 477B Series Handheld Digital Manometer
Installation and Operating Instructions
The Series 477B Handheld Digital Manometer is a versatile, handheld, battery operated manometer available in several basic ranges from 0-20 in w.c. up to 100 psi. All models measure either positive, negative, or differential pressures with ±0.1% of full scale accuracy. Users 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 in locations where it is too dark to read the measurements on the unit.
BATTERY INSTALLATION
The unit is shipped with a separate 9 volt alkaline battery which must be
installed before operation. Remove the two screws holding the bottom endcap in
place and remove the endcap. Connect the battery to the enclosed battery clip,
making sure to observe correct polarity. Be careful not to trap wires between
the battery, case, or foam pads which retain the battery. This could make it
difficult to install the battery or remove it later for replacement. Be sure
that the rubber gasket is properly seated in the gasket channel of the endcap
and replace endcap. Note that the endcap will only fit one way because the
holes are slightly off-center. Place the Z shaped wrist strap clip in one of
the screw recesses and replace the screws. Do not over tighten the screws.
Attach the wrist strap to the clip.
When battery replacement becomes necessary, use only a 9 volt alkaline type
such as a Duracell® MN 1604, Eveready® 522, or equivalent. Zinc-carbon types,
often labeled heavy-duty are not recommended because of the increased
potential for leakage. Alkaline batteries are also a better value because they
last up to three times longer in this device.
Low Battery Indicator
A weak battery can cause improper operation or inaccurate measurements. A low
battery indicator is provided on the display to show when the battery needs
replacement.
NOTICE Although the unit might appear to function and indicate properly, the accuracy of readings cannot be guaranteed when the LOW BAT indicator is illuminated. Replace the battery with a new one. Do not leave an exhausted battery in the unit due to potential leakage.
ON-OFF OPERATION
The on-off control is a toggle function. Press and release the ON/OFF button
once to turn the unit on and press it again to turn it off. If the manometer
is left on with no activity for approximately 20 minutes, the unit will turn
itself off to conserve the battery.
SPECIFICATIONS
- Service: Air and compatible gases.
- Wetted Materials: Consult factory.
- Accuracy: ±0.1% F.S. from 60 to 78°F (15.6 to 256°C); ±1% F.S. from 32 to 60 and 78 to 104°F (0 to 15.6 and 25.6 to 40°C).
- Pressure Hysteresis: ±0.1% F.S.
- Pressure Limits: See chart.
- Temperature Limits: Operating: 0 to 140°F (-17.8 to 60°C); Storage: -4 to 176°F (-20 to 80°C).
- Display: 4-digit LCD (.425˝ H x .234˝ W digits).
- Resolution: See chart.
- Process Connections: Two barbed connections for use with 1/8˝ (3.18 mm) or 3/16˝ (4.76 mm) I.D. tubing for 477B-1, 477B-2, 477B-3, 477B-4, and 477B-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 477B-6 and 477B-7 only.
- Power Requirements: 9 V alkaline battery included, but not connected, user replaceable.
- Weight: 10.2 oz (289 g).
- Compliance: CE.
BACKLIGHT
The Model 477B includes a display backlight to allow use in the dark or in
poor lighting conditions. The manometer must be switched off before this
feature can be activated. Next, press and hold the ON/OFF button. After about
one second, the backlight will come on and remain lighted for approximately 2
minutes after which it will turn itself off to conserve battery life.
ZEROING PRESSURE READING
Potential inaccuracy due to temperature effects can be minimized by re-zeroing
immediately before use. To zero the display, vent both ports to the atmosphere
so no pressure is applied to either port. Press the ZERO/STORE button and will
be momentarily displayed as zeroing occurs. Zeroing is not possible when the
memory mode is in use. It must be done before selecting that function. If the
unit is accidentally zeroed with pressure applied to one of the ports, the
pressure reading might display incorrectly. To correct, vent the pressure
ports to atmosphere and press the ZERO/STORE button to zero the unit.
MODEL CHART
Model
| English Range| English Range| Maximum Pressure|
Available Pressure Units
477B- 1| 0 to 20 in w.c.| 0 to 4.982 kPa| 3 psi (0.21 bar)| psi, in
w.c., in Hg, mm w.c., mm Hg, Pa, kPa, bar, mbar
477B- 2| 0 to 40 in w.c.| 0 to 9.96 kPa| 3 psi (0.21 bar)| psi, in
w.c., in Hg, mm w.c., mm Hg, Pa, kPa, bar, mbar
477B- 3| 0 to 200 in w.c.| 0 to 49.82 kPa| 15 psi (1.03 bar)| psi,
in w.c., in Hg, mm w.c., mm Hg, Pa, kPa, bar, mbar
477B- 4| 0 to 10 psi| 0 to 68.95 kPa| 30 psi (2.07 bar)| psi, in
w.c., in Hg, mm w.c., mm Hg, Pa, kPa, bar, mbar
477B- 5| 0 to 30 psi| 0 to 206.9 kPa| 60 psi (4.13 bar)| psi, in
w.c., in Hg, mm Hg, kPa, bar, mbar
477B- 6| 0 to 50 psi| 0 to 344.8 kPa| 100 psi (6.89 bar)| psi, in
w.c., in Hg, mm Hg, kPa, bar, mbar
477B- 7| 0 to 100 psi| 0 to 689.5 kPa| 200 psi (13.78 bar)| psi, in
w.c., in Hg, mm Hg, kPa, bar, mbar
MEASURING PRESSURE
-
Measuring Single Pressure
To measure single positive pressure, connect the tubing to the port marked + and vent the opposite port to the atmosphere. -
Measuring Differential Pressure
To measure differential pressure, connect the higher positive pressure to the port marked + and the lower positive pressure to the port marked -. The manometer will indicate the difference between the two. -
Selecting Pressure Units
Up to seven pressure units are available. The display will indicate the current selection. To change to different units, use the UNITS/LOC button. Each press of the button will cause an advance to the next choice. The selected units will remain in the memory even when the power is shut off. This way, the user preferences will always be displayed after the initial selection.
FUNCTIONS
DISPLAY HOLD
In situations where a reading needs to be temporarily retained, the Model 477B
includes a display hold feature which freezes the current reading and holds it
on the display until it is cleared. To activate this operation, press the
HOLD/MEMORY button when the desired pressure is displayed. A HOLD indicator
will appear on the display to indicate that the reading shown is frozen. To
return to normal operation, press the HOLD/MEMORY button again. The HOLD
indicator will disappear and the current pressure will be shown.
OVERPRESSURE ALARM
A visual indicator and audible alarm are provided to alert the user that
pressure has exceeded the operating range of the unit. Exceeding the range
will not damage it or affect calibration as long as the maximum rated pressure
is not exceeded. The maximum pressure for all units is shown on the rear label
and on page 1 of these instructions.
CAUTION Do not exceed the maximum rated pressure of the manometer. Doing so will cause permanent damage to the sensor, may rupture the housing, and/or cause personal injury.
MEMORY FUNCTION
A memory function is included in the Model 477B that allows users to store up
to 40 pressure readings for later review or recording. This feature is
especially valuable for making a traverse of duct velocity pressures with a
Pitot tube or for multipoint pressure measurements. The readings are stored in
non-volatile memory so they will be retained even if the unit is shut off or
the battery is removed.
Storing Pressure Readings
To store a reading, press and hold the HOLD/MEMORY button until ST01
displayed. Next, press the ZERO/STORE button to safe the current reading to
the ST01 memory location. A beep will sound indicating that the reading has
been saved. As each reading is saved, the memory location display will advance
to the next number. To resume pressure measurement, press the HOLD/MEMORY
button again. Note that in the memory mode, the display zero function is not
available. To zero the display, exit the memory mode and then press the
ZERO/STORE button.
Viewing Stored Readings – Selecting a Location
To view the contents of the memory, press and hold the HOLD/MEMORY button
until RD01 is displayed. Next, press UNITS/LOC to view other memory locations.
To resume pressure measurement, press the HOLD/MEMORY button again.
Clearing Memory
To clear the contents of the memory, press and hold the HOLD/MEMORY button
until CLR is displayed. Next, press the ZERO/STORE button to clear all
previously stored readings. During this operation — will be displayed. Once
the memory is cleared, the current pressure will be displayed.
Exiting Memory Mode
To exit the memory mode, press the HOLD/MEMORY button again and the unit will
return to normal operation.
DAMPENING FUNCTION
The dampening feature allows users to enter a dampening number from 1 to 16
(default value = 2). Entering a larger number increases the amount of readings
that are averaged for each display update.
-
In order to access the dampening feature:
Press and hold the HOLD/MEMORY button until DAMP is displayed. -
Once DAMP is selected, a number is shown in the upper right portion of the LCD, along with the current pressure reading. This number is the dampening number. Adjust the number up by pressing the ZERO/STORE button or down by pressing the UNITS/LOC button. The LCD update rate slows as the number increases from 1 to 16. Therefore, for best results, choose the smallest number that provides a stable pressure reading.
-
Once the pressure reading is stable, press the HOLD/MEMORY button to store the dampening value.
MAINTENANCE/REPAIR
Upon final installation of the Series 477B, no routine maintenance is
required. The Series 477B is not field serviceable and should be returned if
repair is needed. Field repair should not be attempted and may void warranty.
WARRANTY/RETURN
Refer to “Terms and Conditions of Sale” in our catalog and on our website.
Contact customer service to receive a Return Goods Authorization Number before
shipping the product back for repair. Be sure to include a brief description
of the problem plus any additional application notes.
Duracell® is a registered trademark of Duracell U.S. Operations, Inc.
Eveready® is a registered trademark of Energizer Brand, LLC
©Copyright 2022 Dwyer Instruments, LLC
DWYER INSTRUMENTS, LLC
FR# 443239-51 Rev. 3
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
References
Read User Manual Online (PDF format)
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