Automation Components, Inc.
2305 Pleasant View Road | Middleton, WI 53562
Phone: 1-888-967-5224 | Website: workaci.com
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Version: 22.0
I0000756
Each WPR2 unit can be configured to three output modes: 4-20mA, 0-5V and 0-10V. Use the Wiring
Connections table to determine the proper wiring for your application. See TABLE 1 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.
ZERO FUNCTION
The WPR2 unit should be “ZEROED” before 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 elapse before adjustment to the ZERO. The
Zero adjustment must be performed with NO pressure applied to both sensors.
Directions:
• 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 unit enters zero mode. If zeroing process is
successful, the“ZERO” icon will flash twice.
• Reapply the pipe tape, thread sealant, or pipe compound before sensor installation.
PRESSURE CONNECTIONS
The WPR2 Series have 1/4”-18NPT male ttings. 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 specications. DO NOT REPLACE SENSORS WITH ANY
OTHER SENSORS.THE WPR2 UNITS ARE CALIBRATED WITH THE HIGH AND LOW SENSORS SUPPLIED
WITH THE UNIT. Standard pipe ttings and installation procedures should be used during installation.
Install pipe tape, thread sealant or other suitable pipe compound when connecting the sensor to the
pressure source or any of the accessories. Recommended torque specication is 150 in lbs (16.95 Nm).
If after connecting the pipe, the unit outputs out-of-range signal OVR on display only, turn o the unit,
disconnect the pipe or shut down the valves immediately and check the pressure input with a gauge or
other test instrument.
Note: ACI recommends to mount the pressure transducers on the top side of the pipe. Side mounts are
also acceptable. Refrain from mounting underneath the pipes so that any moisture, sediments, or other
contaminants cannot run down or drip directly onto the sensor.
A Pressure Snubber is included with each sensor to dampen pressure surges. A pigtail siphon should be
used to lower the media temperature below 257°F (125°C) to prevent damage to the pressure sensor.
INPUT RANGE ADJUSTMENT
• Do not switch pressure range and output mode when power is on. Make sure power to the unit is
o. Failure to do so will not allow any new switch settings to take place.
• Choose dierential range based on the expected dierential pressure in your application. Move
switches to the correct positions and then power on the transmitter.
The WPR2 can operate in either unidirectional mode (0 – X PSI) or bidirectional mode (± X PSI). The unit
will be set at unidirectional mode after factory calibration. Refer to TABLE 2 (p. 5) and FIGURE 5 (p. 5).
