Point Four RIU3 Monitor & Controller

Q: How many sensor inputs and control outputs does one RIU3 have?

One probe input per unit, accepting 4–20 mA, 0–5 mV or Modbus RS485, and two SPDT 10 A relay outputs configurable across up to six control blocks.

Q: Which water quality parameters can it monitor?

Dissolved oxygen by galvanic or optical probe, temperature, CO₂, pH, ORP and salinity, depending on which probe option is fitted.

Q: What can it actually control?

Anything the two 10 A relays can switch — the RIU3-Comm-FMsol-PVC package, for example, drives a solenoid valve with a 15 LPM flow meter for oxygen injection. The same relays run alarm conditions and PID loops.

Q: How do I size a system with several measurement points?

One RIU3 takes one probe, so allow a unit per measurement point and daisy-chain them: up to 99 units on a multi-linked network, and you can run as many networks as you need.

Q: Can I calibrate the probe without pulling it out?

Yes — tank-side calibration is done at the probe from the weatherproof 4-button keypad, by a single operator.

Q: How is the data collected and displayed?

Through the RIU3 itself, a Point Four LC Touch Controller, or the Windows-based Point Four Sync HMI software.

Q: Does it reduce cabling?

Yes — only one cable carries the whole system’s data back to the main controller, instead of separate probe and data runs from every device.

A field-mounted transmitter and controller for continuous water quality monitoring across tanks and systems.

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Categories: Monitoring Systems, Oxygen & Ozone, Specials, Water Quality Monitoring

Applications: Hatchery, Live Holding & Purging, RAS

Brand: Pentair

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Product Information

Key Features

Field-mounted transmitter and controller for continuous monitoring and control of water quality
Runs stand-alone or daisy-chained into a multi-linked network of up to 99 units, with unlimited networks
Accepts 4–20 mA, 0–5 mV and Modbus RS485 sensor inputs
Two SPDT 10 A relay outputs, configurable across up to six control blocks for local control, alarms or PID
Tank-side probe calibration from a weatherproof 4-button keypad — one operator, at the probe
Available with dissolved oxygen (galvanic or optical), temperature, CO₂, pH, ORP or salinity probes, or without a probe
Works with the Point Four LC Touch Controller and the Windows-based Point Four Sync HMI software
Sizing: one RIU3 takes one probe and offers two relay outputs, so allow a unit per measurement point and daisy-chain them — up to 99 units per network

Specifications

Specification	Detail
Model	Point Four RIU3 Monitor & Controller
Function	Field-mounted transmitter / controller, stand-alone or networked
Network capacity	Daisy-chained multi-link, up to 99 units per network; unlimited networks
Sensor input types	4–20 mA, 0–5 mV, Modbus RS485 — one probe per unit
Control outputs	2 x SPDT 10 A relays, configurable across up to six control blocks
Control functions	Local control, alarm conditions and PID, set by keypad or PC
Parameters monitored	Dissolved oxygen, temperature, CO₂, pH, ORP, salinity
Calibration	Tank-side, from the weatherproof 4-button keypad
Option — RIU3	Controller only, supplied without probe
Option — RIU3-Comm	OxyGuard Commander galvanic DO / temperature probe, 7 m cable
Option — RIU3-RDO	In-Situ optical dissolved oxygen probe, 10 m cable
Option — 1SSS6025	CO₂ analyser, 7 m cable
Option — RIU3-DpH	Sensorex pH sensor, 6 m cable
Option — RIU3-ORP	Sensorex ORP sensor, 6 m cable
Option — RIU3-Sal	OxyGuard salinity meter, 7 m cable
Option — RIU3-Comm-FMsol-PVC	DO / temperature probe, 15 LPM flow meter, solenoid valve and mounting board
Software and HMI	Point Four LC Touch Controller; Point Four Sync HMI (Windows)

Downloads

Point Four RIU3 Spec Sheet

Frequently Asked Questions

How many sensor inputs and control outputs does one RIU3 have?

Which water quality parameters can it monitor?

What can it actually control?

How do I size a system with several measurement points?

Can I calibrate the probe without pulling it out?

How is the data collected and displayed?

Does it reduce cabling?

Spare Parts & Consumables

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Point Four RIU3 Monitor & Controller

Product Information

Key Features

Specifications

Downloads

Frequently Asked Questions

Spare Parts & Consumables

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