Dwyer WWDP - Manual

Series WWDP Wet-to-Wet Differential Pressure Transducers
Specifications - Installation and Operating Instructions
Bulletin D-27
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.
DWYER INSTRUMENTS, INC.
Phone: 219/879-8000 www.dwyer-inst.com
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A. Fax: 219/872-9057 e-mail: [email protected]
6
[152.4]
5-9/16
[141.29]
R7/64
[R2.78]
11/32
[8.73]
2
[50.8]
1-15/64
[31.35]
1-43/64
[42.47]
1-9/16
[39.69]
5-11/64
[131.37]
61/64
[24.21]
1/8” NPTF
1/2” CONDUIT
OPENING
2
[50.5]
4-39/64
[117.08]
4-53/64
[122.63]
4
[101.6]
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.
Important: Do not exceed maximum range pressure with a total of
differential pressure and line pressure.
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
Figure 1
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.