POINT4 RIU3 Remote Monitor/Controller Installation and User’s Guide
3
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
