Dwyer Instruments WWDP Operating Manual
Series WWDP Wet-to-Wet Differential Pressure Transducers
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1/8˝ NPTF
1
/2˝ CONDUIT
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PENING
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High
Low
High
Valve A
Valve C
Low
Valve B
Differential
Pressure Sensor
Valve A = High Side Valve
Value B = Low Side Valve
Valve C = Shunt Valve
Specifications - Installation and Operating Instructions
he Series WWDP Wet-to-Wet Differential Pressure Transducer offers
T
verything in one package by having 30 field selectable variations in just 3 models.
e
he WWDP provides field selectable unidirectional and bidirectional pressure
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ranges, configurable 0-5, 1-5, 0-10 VDC, and 4 to 20 mA output. It also provides
an auto-zero capability. The field selectable port swap feature eliminates costly
replumbing if the unit is improperly installed or if the transducer is simply replaced.
An optional LCD display is available for on-site indication of line and differential
pressure. The all cast aluminum housing is rated NEMA 4 (IP66). These features
make the WWDP transducer an ideal instrument for measuring the flow of various
liquids and gases, pressure drop across filters, measurement of liquid level or
pressurized vessels, and for use in energy management and process control
systems.
INSTALLATION
The Series WWDP Wet-to-Wet Differential Pressure Transducer has 1/8” NPTF
internal fittings. The high pressure port and low pressure port are located on the
bottom of the unit, labeled “HI” and “LO”, respectively.
MOISTURE PRECAUTIONS
The Series WWDP is provided with a 0.875 DIA. conduit opening for electrical
termination, intended for a 1/2” I.D. conduit connection. This opening must be
sealed according to standard industry practices in order to prevent moisture
ingress into the Series WWDP.
MOUNTING
The Series WWDP can be easily mounted using the two mounting screws located
on the side of the unit.
INSTALLATION PROCEDURES
For differential pressure measurements at high line pressure, it is recommended
that the pressure sensor be installed with a valve in each line, plus a shunt valve
across the high and low (reference) pressure ports as shown in Figure 1.
The remote zero is a normally open relay wired between COM and REMOTE
ZERO terminals. In order to initiate ZERO function, the relay contact shall be
closed.
Bulletin D-27
PECIFICATIONS
S
ervice: Gases or liquids compatible with 17-4 PH stainless steel.
S
ccuracy: All pressure ranges have ±1% full scale accuracy except the lowest
A
selectable range of each unit is ±2% full scale.
Stability: ±0.5% per year.
Temperature Limits: Compensated Temperature Range: 32 to 130˚F
(0 to 54˚C); Operating Temperature Range: -4 to 185˚F (-20 to 85˚C).
Pressure Limits: Max working pressure: WWDP-1: 50 PSI; WWDP-2: 100 PSI;
WWDP-3: 250 PSI; Proof Pressure: 2.2X of full scale; Burst Pressure: 40X of full
scale.
Thermal Effect: 2% FS/100˚F (50˚C) includes zero and span.
Power Requirements: 12 to 30 VDC/18 to 28 VAC (Reverse Excitation
Protected). NOTE: 4-20 mA output cannot be powered with AC voltage.
Output Signal: Selectable 0-5, 0-10 and 1-5 VDC; 4 to 20 mA.
Zero & Span: Digital “re” zero button (should be used when changing ranges). Span
can be adjusted by changing between field selectable ranges.
Response Time: 1 to 5 sec (selectable).
Loop Resistance: 1000 ohms.
Current Consumption: VDC power: 0-5, 1-5 VDC output 4 mA (typ); 0-10 VDC
output 5 mA (typ); 4-20 mA output 20 mA max. Current Consumption will equal
the transmitter output in current mode. VAC power: 0-5, 1-5, 0-10 VDC output 40
mA (typ).
Electrical Connections: 1/2” Conduit.
Process Connections: 1/8” Female NPT Internal.
Enclosure Rating: Designed to meet NEMA 4 (IP66).
Mounting Orientation: Vertical; Mount the pressure ports down (keeps debris
from building up inside the pressure port).
Size: 4 x 6 x 2 in (102 x 152 x 51 mm).
Weight: 1.5 lb (680.4 gm).
Agency Approvals: CE.
Important: Do not exceed maximum range pressure with a total of differential
pressure and line pressure.
ELECTRICAL INSTALLATION
To access the electrical connections, turn the screws on the top of the case counter
clockwise until the hinged cover can be flipped up. The screws are captured and
secured in the cover. Wiring is through the 1/2” conduit opening. Both current and
voltage outputs are reverse excitation protected.
DWYER INSTRUMENTS, INC.
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A. Fax: 219/872-9057 e-mail: info@dwyermail.com
Figure 1
Phone: 219/879-8000 www.dwyer-inst.com
LECTRICAL TERMINATION
A B C D
A B C D
ZERO
OUTPUT
R
ANGES
DC Power
S
upply
Controller
Current
(4-20 mA)
R
elay
EXC.
OUT COM
A B C D
A B C D
BAR
A.REV
SLOW
BI-DIR
SWAP
PSI
NORM
FAST
UNI-DIR
NORM
WWDP-1
WWDP-2
WWDP-3
50
100
250
25
50
125
10
20
50
5
10
25
4-20
0-5 0-10 1-5
DC/AC
Power Supply
Controller
Voltage
Relay
A B C D ABC D
ABC D
ABC D
WWDP-1
WWDP-2
WWDP-3
50
100
250
25
50
125
10
20
50
5
10
25
4-20
0-5
0-10
1-5
PSI
NORM
FAST
UNI-DIR
NORM
BAR
A.REV
SLOW
BI-DIR
SWAP
EXC.
OUT COM
Range Selection Switch
Auto Zero Button
Electrical Output
Configuration
Electrical Connections
WWDP-1
WWDP-2
WWDP-3
A
50
1
00
250
B
25
50
125
C
10
20
50
D
5
10
25
A
B C D
A B C D
Z
ERO
A
4
-20
B
0-5
C
0-10D1-5
PSI
NORM
FAST
UNI-DIR
N
ORM
BAR
A
.REV
SLOW
BI-DIR
SWAP
4
-20 MA
REMOTE ZERO
E
TC.
OUT COM
E
iring: 2-Wire - 4 to 20 mA (Current Output) and Remote Zero
W
he Series WWDP when configured as a current output transducer is a true 2-wire,
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-20 mA current output device and delivers rated current into any external load of
4
0-1000 ohms.
When configured as a 4-20 mA current output device, the current flow is in one
irection only. PLEASE OBSERVE POLARITY.
d
e suggest that an electrical cable shield be connected to the system’s loop circuit
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round to improve electrical noise rejection.
g
Min. Supply Voltage: 12 + .02 x (Resistance of receiver plus line)
Max. Supply Voltage: 30 + .004 x (Resistance of receiver plus line)
ote: The Zero terminals, connected to digital output, provide contact closure relay for
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utomatic reset to zero pressure by the monitoring system. CAUTION: ZERO input is for
a
dry contact, do not apply voltage to ZERO Terminals.
Figure 2
Wiring: 3-Wire, 0 to 5, 0 to 10, 1-5 VDC and Remote Zero
The Series WWDP when configured for voltage output is a 3-wire circuit device
with three terminals available for wiring. The -Excitation and -Output are
commoned on the circuit.
Caution: Do Not Connect “+” exc to “+” out.
The Series WWDP can operate from 12-30 VDC (18-28 VAC) nominal output
power supply.
Note: The ZERO terminals, connected to digital output, provide a contact closure
relay for automatic reset to zero pressure by the monitoring system. CAUTION:
ZERO input is for dry contact, do not apply voltage to ZERO Terminals.
Installation of the Series WWDP is now complete.
mportant: Prior to putting the unit into service, press the “Zero” button,
I
hen use the “Range Selection Switch” to select a range. After selecting a
t
ange, press the “Zero” button again. For instructions regarding operation
r
of the Series WWDP, please refer to the following, Operation.
OPERATION
Figure 4
ange Selection Switch: The unit is set to the highest range when calibrated. To
R
elect the other ranges, slide the switch to the right. Important: Push “zero” button
s
fter installing the Series WWDP, and after changing range.
a
Auto Zero Button: Press and hold the “ZERO” push-button for 2 seconds to
automatically reset zero or provide contact closure on “Remote Zero”, see Figure
2 and Figure 3.
Electrical Output: The unit is set to 4-20 mA. To select another output, move the
slide switch to the right.
Electrical Connections: Electrical termination for power supply, 3-wire voltage output and
2-wire true 4-20 mA current output, and remote zero wiring.
A.Rev/NORM: A.REV: Analog Reverse: When in reverse mode, the output increases
when the differential pressure decreases and decreases as pressure increases. NORM:
When in Normal mode, output increases as pressure increases and decreases as
pressure decreases.
SLOW/FAST: When Slow mode is selected, 5-second averaging is provided for surge
damping.
BI-DIR/UNI-DIR: Select UNI-Directional or BI-Directional mode. Unidirectional
measures from 0 to full scale differential pressure. Bidirectional
mode measures
pressure from minus 1/2 of full scale to plus 1/2 of full scale differential pressure. Output
will read 1/2 full scale when differential pressure is zero.
SWAP/NORM: Jumper selectable Port Swap feature eliminates costly replumbing when
incorrectly installed or replaced. Go from NORMAL to SWAP and the jumper makes the
“HI” Port “LO” and the “LO” Port “HI”.
RETURNING PRODUCTS FOR REPAIR
Please contact Dwyer Instruments, Inc. before returning unit for repair to review
information relative to your application. Many times only minor field adjustments may be
necessary. When returning a product to Dwyer Instruments, Inc., the material should be
carefully packaged and shipped.
mode
Upon final installation of the Series WWDP Differential Pressure Transducer, no
routine maintenance is required. A periodic check of system calibration is
recommended. The Series WWDP is not field serviceable and should be returned
if repair is needed (field repair should not be attempted and may void warranty). Be
sure to include a brief description of the problem plus any relevant application
DWYER INSTRUMENTS, INC.
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A. Fax: 219/872-9057 e-mail: info@dwyermail.com
©Copyright 2018 Dwyer Instruments, Inc. FR# 443565-00 Rev. 3
Figure 3
notes. Contact customer service to receive a return goods authorization number
before shipping.
Note: Please remove any pressure fittings and plumbing that you have installed and
enclose any required mating electrical connectors and wiring diagrams.
Phone: 219/879-8000 www.dwyer-inst.com
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