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RIU3
REMOTE MONITOR/CONTROLLER
INSTALLATION AND
USER’S GUIDE
INWATER
TECHNOLOGIES
POINT4 RIU
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POINT4 RIU3 Remote Monitor/Controller Installation and User’s Guide
2
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TABLE OF CONTENTS
OVERVIEW
SYSTEM COMPONENTS
SYSTEM WIRING
TYPICAL RIU WIRING CONFIGUATIONS
TYPICAL PROBE WIRING
RIU3 FRONT PANEL
RIU3 OPERATION
CONTROL BLOCK OPERATION
PROBE CALIBRATION
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RIU3 Manual Rev. C 11/12/19
POINT4 RIU3 Remote Monitor/Controller Installation and User’s Guide
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OVERVIEW
This manual is designed as a guide to assist users in becoming familiar with the various functions of the RIU3 (remote interface
unit). Each section of this manual is set up to easily guide users through all stages of installation, setup and maintenance.
Starting from unpacking and inspecting the box, this manual will explain all parts and functions of the system to allow users
to get the most out of the RIU3 for all their system monitoring needs.
The PT4 RIU3 is a eld mounted single sensor transmitter/controller. The unit is compatible with a variety of water
quality probes such as dissolved oxygen, temperature and pH. For a full list of compatible probes, see Table1. The
RIU3 is equipped with a large font 8 x 2 backlit display so the user can view the sensor readings .The unit contains two
SPDT 10amp relays to be used for alarm and/or control outputs. The control blocks can be congured as described
on page 19. Probe calibration can also be done via the RIU3 interface as described on page 21.
The RIU3 uses IP67-rated cable glands for the power, data and probe connections, sealing the unit for wet
environments. Although the RIU will function as a standalone controller, multiple units may be daisy chained for a
network connection. This allows the user to collect, manipulate and control all of the data via the PT4 LC Controller
or using the PT4 Sync HMI Software (Windows Based).
Probe Description Manufacturer Parameters Signal Type
Galvanic DO/Temp OxyGuard %Sat, mg/L, DegC mV, ermistor
Galvanic DO OxyGuard %Sat or mg/L mV
Optical DO In-Situ %Sat, mg/L, DegC RS485
pH Sensorex pH 4-20 mA
ORP Sensorex mV 4-20 mA
Salinity OxyGuard ppt 4-20 mA
Dissolved CO2 w/ transmitter OxyGuard mg/L 4-20 mA
Temperature OxyGuard DegC 4-20 mA
Level Switch RHFS Low/High Level Dry Contact
Additional probes with 4-20 mA, 0-5V, or mV outputs may also be compatible with the RIU3. Contact
InWater Technologies for more information.
Table 1: RIU3-compatible probes
POINT4 RIU3 Remote Monitor/Controller Installation and User’s Guide
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SYSTEM COMPONENTS
System Components
1) RIU LCD Display : 4 x 20 Backlit Alpha Numeric
2) 4-Button Foil Switch
3) PG9 Cable Gland for Probe Input
4) PG9 Cable Glands for Power and Data connections (x2)
5) PG7 Cable Glands for Relay Outputs (x2)
6) Optional Enclosure Mounting Feet (x4)
System Specications
1) Power: 12-24 VDC, 180 mA max
2) Auxiliary power for loop-powered probes: Onboard
isolated 24 VDC loop power supply
3) Input: Inputs are factory-congurable for probes listed
inTable1. Additional probe types are available upon request
4) Outputs: Two SPDT 10 Amp relays – user congurable,
RS-485 MODBUS communications
5) Environmental: IP67 water tight enclosure, sealed cable
glands
6) Dimensions: 125x125x75 mm
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POINT4 RIU3 Remote Monitor/Controller Installation and User’s Guide
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SYSTEM WIRING
1. Ch1 input connector
i. A 2 pin connector for the rst channel for a probe input.
2. Ch2 input connector
i. A 2 pin connector for the second channel for a probe input.
3. Isolated DC output for auxiliary probe power
i. A 2 pin connector used to provide 24 VDC isolated auxiliary probe power.
4. Auxiliary RS485 input connector
i. A 2 pin connector for RS485 probe inputs.
5. Power & RS485 inputs
i. 5 pin connectors. Pins 1 and 2 are used to connect DC power to the RIU3. Pins 3 and 4 are used to connect the Modbus
RS485 signal to the RIU3. Pin 5 is used to connect the shield of the cable to the RIU3 ground. See page 6 for wiring information.
6. Data Tx & Rx LEDs
i. These LEDs indicate Modbus RS485 communications. The Rx LED will blink when a Modbus message is received by the
RIU3 and the Tx LED will blink when a Modbus message is transmitted by the RIU3.
7. Relay output connectors
i. 3 pin connectors used to connect the relay output to an external device. Normally open or normally closed congurations
can be used. See page 6 for wiring information.
8. SPDT relays
i. Single pole, double throw relays rated for up to 24VDC , 10 A.The relay status is controlled by RIU3 control blocks, which can
be congured through the Control menu using the 4-button foil switch. See page 19 for control block conguration information.
POINT4 RIU3 Remote Monitor/Controller Installation and User’s Guide
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TYPICAL RIU WIRING CONFIGURATIONS
Typical RIU Wiring Congurations
1. Wiring for use with PT4 LC or other SCADA system
Relay Wiring Examples
1. Dry Contact – Normally Open or Normally Closed
2. Live Contact – RIU or External Power
2. Wiring for use with a PC
Warning: If the Data and Power wires are not connected to the appropriate terminals, damage to the RIU3 may occur. This will
void the warranty. Please ensure all connections are correct before powering up the unit.
POINT4 RIU3 Remote Monitor/Controller Installation and User’s Guide
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TYPICAL PROBE WIRING
Typical Probe Wiring Congurations
1. OxyGuard DO/Temp Probe
2. OxyGuard DO Probe
POINT4 RIU3 Remote Monitor/Controller Installation and User’s Guide
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TYPICAL PROBE WIRING
Typical Probe Wiring Congurations
3. InSitu RDO Optical DO Probe
4. Sensorex ORP or pH Probe
POINT4 RIU3 Remote Monitor/Controller Installation and User’s Guide
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TYPICAL PROBE WIRING
Typical Probe Wiring Congurations
5. OxyGuard Temperature Probe
6. Level Switch
POINT4 RIU3 Remote Monitor/Controller Installation and User’s Guide
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1. LCD Display
i. A 2x8 Backlit LCD display.
2. “Up” Button
i. Scrolls up through menu options or input characters, or in the main menu, toggles between display parameters.
3. “Enter” Button
i. This button is used while in the conguration menu to conrm a selection or user input. See page 11 for more
information about navigating the RIU3 menu.
4. “Return” Button
i. This button can be held for 3 seconds to enter into the RIU3 conguration menu. While in the conguration, this
can be pressed to return to the previous menu page.
5. “Down” Button
i. Scrolls up through menu options or input characters, or in the main menu, toggles between display parameters.
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1
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Return button
Down button
1 Backlit LCD Display
2 Up button
3 Enter button
RIU3 FRONT PANEL
Indice
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