Waterguard+ connected to a motion sensor via I/O module for automatic water supply control

Introduction

The new Waterguard+ system can be connected to external motion sensors via an I/O module. This makes it possible to automatically shut off the water supply when no movement is detected in the room for a certain period. Once presence is detected again, the water supply is resumed.

This solution is especially useful in restroom areas in public buildings. It reduces the risk of water damage, lowers unnecessary water consumption from continuously running toilets, and helps prevent vandalism-related damage.

Note: Only the Linkbox+ 4G can be used for this integration.

System Overview

Wiring Diagram

Solution Description

The Linkbox+ 4G (B) is installed and connected to a valve (C) in the relevant room (typically a restroom, kitchen area, or similar).

The I/O module (R) is installed nearby (e.g., in the ceiling) and connected to a 5–28V DC power supply, as well as to a dry contact signal from the motion sensor (I) via the IN1 port on the I/O module.

Finally, the I/O module is paired with the Linkbox+ 4G using the Abralife app.

NOTE: The Linkbox+ 4G will automatically shut off the water supply 1 hour after the last detected movement.

Signal Table

Signal	Connection on I/O Module
Signal to open valve	IN1
All inputs must be connected to ground
5–28V DC	+
	-

Input specification:
Dry contact input (potential-free switch or relay)

Required Components

To connect a Waterguard+ system to a motion sensor via an I/O module, you will need the Develco (Frient) Smart I/O Module (Article number: 94438 / EAN: 5713594003986), along with suitable wiring for dry contact signals between the motion sensor and the I/O module.

Example motion sensor: Micromatic PIR / Motion Sensor (SE41440 / EL: 1404494)

Abra Portal and Remote Management

In multi-dwelling or commercial buildings, significant benefits can be achieved by using Abra as the top-level system. Building managers gain access to the Abra Portal (N) for centralized monitoring, allowing early detection and prevention of unwanted situations.

Cross-unit alerts (e.g., fire) increase safety for residents without requiring multiple apps or systems.

The Abra ecosystem is continuously evolving, and more parts of the building’s technical infrastructure will become compatible with Abra in the future. Click here to learn more.