Dwyer Instruments 477B Series Installation & 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 ®
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 f the manometer is left on with no
activity for approximately 20 minutes the unit will turn itself off to conserve the
battery
English Metric
Model Range Range
477B-1 0 to 20 in w c 0 to 4 982 kPa
477B-2 0 to 40 in w c 0 to 9 96 kPa
477B-3 0 to 200 in w c 0 to 49 82 kPa
477B-4 0 to 10 psi 0 to 68 95 kPa
477B-5 0 to 30 psi 0 to 206 9 kPa
477B-6 0 to 50 psi 0 to 344 8 kPa
477B-7 0 to 100 psi 0 to 689 5 kPa
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
Series 477B Handheld Digital Manometer
Specifications - Installation & Operating Instructions
522 or equivalent Zinc-carbon types often
Maximum
Pressure Available Pressure Units
3 psi (0 21 bar) psi in w c in Hg mm w c mm Hg Pa kPa bar mbar
3 psi (0 21 bar) psi in w c in Hg mm w c mm Hg Pa kPa bar mbar
15 psi (1 03 bar) psi in w c in Hg mm w c mm Hg Pa kPa bar mbar
30 psi (2 07 bar) psi in w c in Hg mm w c mm Hg Pa kPa bar mbar
60 psi (4 13 bar) psi in w c in Hg mm Hg kPa bar mbar
100 psi (6 89 bar) psi in w c in Hg mm Hg kPa bar mbar
200 psi (13 78 bar) psi in w c in Hg mm Hg kPa bar mbar
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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) 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) 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
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 t must be done before selecting that function
f 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
Bulletin D-26B
BARBED FOR 1/8
OR 3/16 ID TUBING
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