Dwyer Instruments 477B Operating Manual

Series 477B Handheld Digital Manometer

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Specifications - Installation & Operating Instructions

he Series 477B Handheld Digital Manometer is a versatile, handheld, battery

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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

nd metric pressure units, so conversions are not necessary. A memory function

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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

he unit is shipped with a separate 9 volt alkaline battery which must be installed

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efore operation. Remove the two screws holding the bottom endcap in place and

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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.

Bulletin D-26B

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

nd 78 to 104°F (0 to 15.6 and 25.6 to 40°C).

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ressure Hysteresis: ±0.1% F.S.

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ressure Limits: See chart.

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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, installed non-functional, user
replaceable.

Weight: 10.2 oz (289 g).
Agency Approvals: CE.

When battery replacement becomes necessary, use only a 9 volt alkaline type such
as a Duracell
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.

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.

Model
477B-1
477B-2
477B-3
477B-4
477B-5
477B-6
477B-7

NOTICE

English
Range

0 to 20 in w.c.
0 to 40 in w.c.
0 to 200 in w.c.
0 to 10 psi
0 to 30 psi
0 to 50 psi
0 to 100 psi

®

MN 1604, Eveready®522, or equivalent. Zinc-carbon types, often

Although the unit might appear to function and indicate properly,
the accuracy of readings cannot be guaranteed when the LOW

Metric
Range

0 to 4.982 kPa
0 to 9.96 kPa
0 to 49.82 kPa
0 to 68.95 kPa
0 to 206.9 kPa
0 to 344.8 kPa
0 to 689.5 kPa

Maximum
Pressure

3 psi (0.21 bar)
3 psi (0.21 bar)
15 psi (1.03 bar)
30 psi (2.07 bar)
60 psi (4.13 bar)
100 psi (6.89 bar)
200 psi (13.78 bar)

Available Pressure Units

psi, in w.c., in Hg, mm w.c., mm Hg, Pa, kPa, bar, mbar
psi, in w.c., in Hg, mm w.c., mm Hg, Pa, kPa, bar, mbar
psi, in w.c., in Hg, mm w.c., mm Hg, Pa, kPa, bar, mbar
psi, in w.c., in Hg, mm w.c., mm Hg, Pa, kPa, bar, mbar
psi, in w.c., in Hg, mm Hg, kPa, bar, mbar
psi, in w.c., in Hg, mm Hg, kPa, bar, mbar
psi, in w.c., in Hg, mm Hg, kPa, bar, mbar

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.

DWYER INSTRUMENTS, INC.

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A. Fax: [phone] e-mail: [e-mail]

Phone: [phone] www.dwyer-inst.com

MEASURING PRESSURE

easuring Single Pressure

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o measure single positive pressure, connect the tubing to the port marked + and

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ent the opposite port to the atmosphere.

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easuring Differential Pressure

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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.

electing Pressure Units

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p to seven pressure units are available. The display will indicate the current

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election. To change to different units, use the UNITS/LOC button. Each press of

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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.

ISPLAY HOLD

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n situations where a reading needs to be temporarily retained, the Model 477B

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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,

ress the HOLD/MEMORY button again. The HOLD indicator will disappear and

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he current pressure will be shown.

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VERPRESSURE ALARM

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visual indicator and audible alarm are provided to alert the user that pressure has

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xceeded the operating range of the unit. Exceeding the range will not damage it

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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.

AMPENING FUNCTION

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he dampening feature allows users to enter a dampening number from 1 to 16

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default value = 2). Entering a larger number increases the amount of readings that

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re averaged for each display update.

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1. 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,

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long with the current pressure reading. This number is the dampening number.

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djust the number up by pressing the ZERO/STORE button or down by pressing

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he UNITS/LOC button. The LCD update rate slows as the number increases

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from 1 to 16. Therefore, for best results, choose the smallest number that
provides a stable pressure reading.

3. Once the pressure reading is stable, press the HOLD/MEMORY button to store

he dampening value.

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AINTENANCE/REPAIR

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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.

ARRANTY/RETURN

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efer to “Terms and Conditions of Sale” in our catalog and on our website. Contact

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ustomer service to receive a Return Goods Authorization Number before shipping

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the product back for repair. Be sure to include a brief description of the problem plus
any additional application notes.

CAUTION

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.

Do not exceed the maximum rated pressure of the manometer.
Doing so will cause permanent damage to the sensor, may

®

Duracell

Everready

©Copyright 2015 Dwyer Instruments, Inc. Printed in U.S.A. 4/15 FR# 443239-51 Rev. 2

DWYER INSTRUMENTS, INC.

®

is a registered trademark of The Everready Battery Company, Inc.

Phone: [phone] www.dwyer-inst.com

is a registered trademark of The Gillette Company

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A. Fax: [phone] e-mail: [e-mail]