Aci WPR2-300 Series Manuale utente

Installation and Operation Instructions

WPR2-300 Series

Wet to Wet Differential Pressure

Version : 7.0

I0000762

Page 1 of 5

Figure 1: WPR2-300 Dimensions and Hardware

Precautions

 REMOVE

POWER

BEFORE

WIRING.

NEVER

CONNECT

DISCONNECT

WIRING

WITH

THE

POWER

APPLIED.

NOT

ALLOW

LIVE

WIRES

TOUCH

THE

CIRCUIT

BOARD.

 AN

ISOLATION

TRANSFORMER

RECOMMENDED

WHEN

POWERING

THE

DEVICE

WITH

24VAC.

 DO

NOT

RUN

THE

WIRING

ANY

CONDUIT

WITH

LINE

VOLTAGE.

 FAILURE

WIRE

DEVICES

WITH

THE

CORRECT

POLARITY

WHEN

USING

SHARED

TRANSFORMER

MAY

RESULT

DAMAGE

ANY

DEVICE

POWERED

THE

SHARED

TRANSFORMER.

 DO

NOT

SWITCH

PRESSURE

RANGE

AND

OUTPUT

MODE

WHEN

POWER

ON.

MAKE

SURE

POWER

OFF

THE

UNIT

FIRST,

THEN

MOVE

JUMPERS

THE

RIGHT

POSITIONS

AND

THEN

POWER

THE

TRANSMITTER.

 DO

NOT

APPLY

ANY

EXTERNAL

VOLTAGE

ZERO

TERMINALS.

 DO

NOT

REPLACE

PRESSURE

SENSORS

WITH

ANY

OTHER

SENSORS.

NOT

INTERCHANGE

THE

HIGH

AND

LOW

SENSORS.

THE

HIGH

AND

LOW

SENSORS

ARE

SPECIFICALLY

CALIBRATED

THE

WPR2

UNIT.

ANY

CHANGES

THE

SENSORS

WILL

VOID

THE

PRODUCT

WARRANTY

2.60"

5.47"

3.00"

4.47"

5.28"

Ø0.200"

Version : 7.0

I0000762

Page 2 of 5

Wiring

Shielded cable with 16 to 22AWG conductors is recommended. Each WPR2-300 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)

Output Signal

(SW7 Position 2)

Supply

Voltage

Wire Connections

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

Table 1: Wiring Connections

WPR2 Terminals

V+ IOUT VOUT COM ZERO

VDC/VAC

Power Supply

Voltage

Meter

Relay

Com

WPR2 Terminals

V+ IOUT VOUT COM ZERO

VDC

Power Supply

Current

Meter

Relay

Com

AUTO ZERO

The WPR2-300 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 WPR2-300 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 WPR2-300 UNITS ARE CALIBRATED WITH THE

HIGH AND LOW SENSORS SUPPLIED WITH THE UNIT.

All WPR2-300 units can handle a proof pressure of 600 psi for both HIGH and LOW pressure sensors. If after

connecting the pipe, the unit outputs out-of-range diagnostic signal OVR on display only, turn off the unit,

disconnect the pipe or shut down the valves immediately and check the pressure input with a gauge or other test

instrument.

Version : 7.0

I0000762

Page 3 of 5

Pressure Snubbers are optional with each WPR2-300 unit. The Pressure Snubber is used to dampen pressure

surges. A pigtail siphon should be used to lower the media temperature below 230°F (110°C) to prevent damage

to the pressure sensor.

Pump

WPR2-300

Power High Low

Direction of

Water Flow

Direction of

Water Flow

Return W ater Line (55 PSI)Supply Water Line (60 PSI)

Pressure Snubber

(Optional)

Shut Off Valve

0-300 PSI Pressure

Transducer

Pressure Snubber

(Optional)

Shut Off Valve

0-300 PSI Pressure

Transducer

Supply Voltage & Control Signal

ACI/WPR

Installation

INPUT RANGE ADJUSTMENT

 DO NOT SWITCH PRESSURE RANGE AND OUTPUT MODE WHEN POWER IS ON.

o MAKE SURE POWER TO THE UNIT IS OFF. FAILURE TO DO SO WILL NOT ALLOW ANY NEW

SWITCH SETTINGS TO TAKE PLACE.

 CHOOSE DIFFERENTIAL RANGE BASED ON THE EXPECTED DIFFERENTIAL PRESSURE IN YOUR

APPLICATION.

o MOVE SWITCHES TO THE CORRECT POSITIONS AND THEN POWER ON THE TRANSMITTER.

 MAXIMUM LINE PRESSURE IS 300 PSI FOR A/WPR2-300.

The WPR2-300 can operate in either unidirectional mode (0 – X psid) or bidirectional mode (± X psid). The unit

will be set at unidirectional mode after factory calibration.

Unidirectional Mode

 DIP switch SW7 position 1 set at UNI side.

 DIP switch SW7 positions 4 and 5 are for Range Selection

ACI/Part No. SW7 Position 5: 1 SW7 Position 5: 2

Position 4: A Position 4: B Position 4: A Position 4: B

A/WPR2-300 0-300 psi

0-150 psi

0-75 psi

0-30 psi

Bidirectional Mode

 DIP switch SW7 position 1 set at BI side.

 DIP switch SW7 positions 4 and 5 are for Range Selection

Note: In Bidirectional mode, a value of 0 psid will have an output equal to 50% of the full output range.

ACI/Part No. SW7 Position 5: 1 SW7 Position 5: 2

Position 4: A Position 4: B Position 4: A Position 4: B

A/WPR2-300 ±300 psid ±150 psid ±75 psid ±30 psid

Version : 7.0

I0000762

Page 4 of 5

134

Figure 1

ENGINEERING UNITS ADJUSTMENT

This option is ONLY for units with LCD display. Switch DIP switch SW7 position 3 to select PSI or BAR.

Advanced Features

For units with LCD display:

 “ERROR” icon will be on when differential pressure is out of range.

 “OVR” icon will be on when gage pressure is out of range on either the high or low port.

Trouble Shooting

Problem Trouble Shooting Steps

“ERROR” icon on Display will be on

when differential pressure is out of range.

The differential pressure could be lower

or higher than the selected range.

“OVR” icon on Display will be on when

the input pressure is > than 300 psi.

Check pressure input with a gauge or

other test instrument.

1. Verify the HIGH Sensor Voltage is between

0.5 VDC (0 psi) and 4.5 VDC (100 psi)

When measuring from the HIGH Sensor terminal

Block “GND” to “OUT”. If out of range call ACI for

Technical support.

2. Verify the LOW Sensor Voltage is between

0.5 VDC (0 psi) and 4.5 VDC (100 psi)

When measuring from the LOW Sensor terminal

Block “GND” to “OUT”. If out of range call ACI for

Technical support.

3. Verify in Uni-Directional Mode that the HIGH Sensor

Voltage is ≥ the LOW Sensor Voltage. If voltage is

anything different call ACI for Technical support.

Output reading @ 4mA or 0 VDC

all the time

1. Verify proper Supply Voltage at the transducer meets the

Product Specifications.

2. Verify 5 VDC Reference voltage across “VIN” to “GND”

terminals for both the HIGH & LOW Sensor

terminal blocks. If voltage is anything different than

5VDC call ACI for Technical support.

Erroneous Readings 1. Bleed Air from System.

2. Repeat the Auto Zero calibration on page 2.

Version : 7.0

I0000762

Page 5 of 5

Product Specifications

Supply Voltage 4-20mA Output: 250 Ohm Load 16-36 VDC

4-20mA Output: 500 Ohm Load 20-36 VDC

0-5 VDC Output: 16-36 VDC / 24VAC (±10%)

0-10 VDC Output: 16-36 VDC / 24VAC (±10%)

Supply Current 24mA minimum

Output 2-wire, 4 to 20mA DC Current (500 Ohm Load Max.)

or 3-wire, 0-5 or 0-10VDC (5K Ohm Min.)

Sensor Accuracy1 ±1% FSO

±1.5% FSO for 0-30/±30 psid ranges

Output Update Rate 1 Second Interval

Response Time (0-100%) 8 Seconds

Operating Temperature Range Sensor: -40 to 230

F (-40 to 110

Enclosure: 5 to 176°F(-15 to 80°C)

Sensor Cable: 0 to +75°C (32 to 167°F)

Compensated Temperature Range 32 to 140

F (0 to 60°C)

Humidity 10 to 90% RH, non-condensing

Thermal Effects2 ±2% FSO (0 to 60

Proof Pressure 2 x F.S. for WPR2-300 series

Burst Pressure 1500 psi

Media Gases, refrigerants, ammonia and water-based fluids *

Features Depluggable terminal blocks

Push button/Remote Auto Zero

DIP switch selectable ranges and output modes

Out-Of-Range Diagnostic Output

Enclosure IP66 Rated (Mounting Flanges

Screws Included)

Approvals RoHS

Display Optional LCD display

Note 1: Accuracy includes linearity, hysteresis and repeatability.

Note 2: Shift is relative to 77°F (25°C).

*Please contact ACI for petrol chemical compatible versions.

Table 2: Product Specifications

Warranty Specification

The ACI WPR2 Series is covered by ACI’s Five (5) Year Limited Warranty, which is located in the front of ACI’S

SENSORS & TRANSMITTERS CATALOG or can be found on ACI’s web site:

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