ACI-Automation Components WPR2 Series Instruction Sheet
WPR2 Series (Max. Line Pressure < 300 PSI)
Installation and Operation Instructions
Wet to Wet Differential Pressure
Ø0.200"
2.60"
4.47"
5.47"
5.28"
3.00"
Figure 1: WPR2 Dimensions and Hardware
Precautions
REMOVE POWER BEFORE WIRING. NEVER CONNECT OR DISCONNECT WIRING WITH THE
POWER APPLIED. DO NOT ALLOW LIVE WIRES TO TOUCH THE CIRCUIT BOARD.
AN
ISOLATION TRANSFORMER IS RECOMMENDED WHEN POWERING THE DEVICE WITH
24VAC.
DO
FAILURE
DO
DO
DO
NOT RUN THE WIRING IN ANY CONDUIT WITH LINE VOLTAGE.
TO
WIRE DEVICES WITH THE CORRECT POLARITY WHEN USING A SHARED
TRANSFORMER MAY RESULT IN DAMAGE TO ANY DEVICE POWERED BY THE SHARED
TRANSFORMER.
NOT SWITCH PRESSURE RANGE AND OUTPUT MODE WHEN POWER IS ON. MAKE SURE TO
POWER OFF THE UNIT FIRST, THEN MOVE JUMPERS TO THE RIGHT POSITIONS AND THEN
POWER ON THE TRANSMITTER.
NOT APPLY ANY EXTERNAL VOLTAGE TO ZERO TERMINALS.
NOT REPLACE PRESSURE SENSORS WITH ANY OTHER SENSORS. DO NOT INTERCHANGE
THE HIGH AND LOW SENSORS. THE HIGH AND LOW SENSORS ARE SPECIFICALLY
CALIBRATED TO THE WPR2 UNIT.
CHANGES TO THE SENSORS WILL VOID THE PRODUCT WARRANTY
ANY
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Wiring
Shielded cable with 16 to 22AWG conductors is recommended. Each WPR2 unit can be configured to three
output modes: 4-20mA, 0-5V and 0-10V. Use the Wiring Connections table below to determine the proper
wiring for your application. See Figure 1 below for Output Mode and Output Signal switch positions.
Note: The WPR2 units are shipped from the factory set up with a 0-10 VDC output.
Output Mode
(SW8)
Vout 0-5 VDC (5V) VAC/VDC V+ COM VOU
Vout 0-10 VDC (10V) VAC/VDC V+ COM VOU
mA 4-20 mA VDC V+ IOU
Output Signal
(SW7 Position 2)
Table 1: Wiring Connections
WPR2 Terminals
Supply
Voltage
Wire Connections
WPR2 Terminals
V+
IOUT VOUT
+
Com
Com
+
COM
ZERO
Relay
+
VDC
Power Supply
Com
Com
Current
Meter
+
V+
IOUT VOUT
COM
Relay
ZERO
VDC/VAC
Power Supply
Voltage
Meter
AUTO ZERO
The WPR2 unit should be “ZEROED” before the pressure transducers are installed on the pipes.
The Auto zero button and remote zero are both used to cancel out the offsets caused by installation and sensor
drift.
NOTE: Make sure a minimum of 10 minutes of warm-up time before adjustment to the ZERO.
The Auto Zero adjustment should only be performed with NO pressure applied to both sensors.
Shut off your main pressure valve and open a shutoff valve with hose drain to equalize the pressure in
the line to your atmosphere.
Remove the sensors from the system to remove pressure from each sensor to achieve equal pressure.
Push “ZERO” button or “SHORT ZERO PIN” for 2 seconds to “COM PIN” before installation or
when it is necessary.
For units with LCD display:
“ZERO” icon will be on when the push button is released. If auto zero is successful, “ZERO” icon will flash
twice, otherwise “ERROR” and “OVR” icons will flash twice.
Pressure Connections
The WPR2 Series have 1/4"-18NPT male fittings. The sensors are labeled “SENSOR HIGH” and “SENSOR
LOW”; MAKE SURE THE SENSORS ARE WIRED TO THE CORRESPONDING TERMINAL
BLOCK INSIDE THE HOUSING. Otherwise ACI will not guarantee the accuracy specifications. DO NOT
REPLACE SENSORS WITH ANY OTHER SENSORS. THE WPR2 UNITS ARE CALIBRATED WITH
THE HIGH AND LOW SENSORS SUPPLIED WITH THE UNIT.
All WPR2 units can handle a proof pressure of 3X THE MAXIMUM LINE PRESSURE for both HIGH and
LOW pressure sensors. If after connecting the pipe, the unit outputs out-of-range signal OVR on display only,
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Version : 17.0
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