Dwyer Instruments 477B Series Manual

Series 477B Handheld Digital Manometer
Bulletin D-26B
Specifications - Installation & Operating Instructions
SPECIFICATIONS
Service: Air and compatible gases
etted 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 CD ( 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
eight: 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
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
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
41/64
[16.27]
1-1/16
[26.99]
BARBED FOR 1/8
OR 3/16 ID TUBING
5-57/64
[149.68]
2-13/16
[71.44]
29/32
[23.02]
Although the unit might appear to function and indicate properly
the accuracy of readings cannot be guaranteed when the OW
BAT indicator is illuminated Replace the battery with a new one Do not leave an
exhausted battery in the unit due to potential leakage
NOTICE
Model
477B-1
477B-2
477B-3
477B-4
477B-5
477B-6
477B-7
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
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
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
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)
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
TestEquipmentDepot.com

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
1 n order to access the dampening feature
Press and hold the HO D/MEMORY button until DAMP is displayed
2 Once DAMP is selected a number is shown in the upper right portion of the CD
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 UN TS/ OC button The CD 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
3 Once the pressure reading is stable press the HO D/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
ARRANTY/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
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 UN TS/ OC 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
DISPLAY HOLD
n 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 HO D/MEMORY
button when the desired pressure is displayed A HO D indicator will appear on the
display to indicate that the reading shown is frozen To return to normal operation
press the HO D/MEMORY button again The HO D 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
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 HO D/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 HO D/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 HO D/MEMORY button
until RD01 is displayed Next press UN TS/ OC to view other memory locations
To resume pressure measurement press the HO D/MEMORY button again
Clearing Memory
To clear the contents of the memory press and hold the HO D/MEMORY button
until C R 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 HO D/MEMORY button again and the unit will
return to normal operation
©Copyright 2015 Dwyer nstruments nc Printed in U S A 4/15 FR# 443239-51 Rev 2
Duracell®is a registered trademark of The Gillette Company
Everready®is a registered trademark of The Everready Battery Company nc
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
CAUTION