Dwyer Instruments WWDP Series Installation And Operating Instructions

The Series WWDP Wet-to-Wet Differential Pressure Transducer
offers everything in one package by having 30 field selectable variations in
just 3 models. The WWDP provides field selectable unidirectional and
bidirectional pressure 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.
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 46361, U.S.A.
Series WWDP Wet-to-Wet Differential Pressure Transducers
Specifications - Installation and Operating Instructions
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1/2" CONDUIT
OPENING
SPECIFICATIONS
Service: Gases or liquids compatible with 17-4 PH stainless steel.
Accuracy: All pressure ranges have ±1% full scale accuracy except the
lowest 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.
High
Valve A
High
Phone: 219/879-8000
Fax: 219/872-9057
Bulletin D-27
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1/8" NPTF
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Low
Valve B
Valve C
Low
Valve A = High Side Valve
Differential
Value B = Low Side Valve
Pressure Sensor
Valve C = Shunt Valve
Figure 1
www.dwyer-inst.com
e-mail: info@dwyer-inst.com
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