Software Activation


Wired M-BUS module for Woltmann meters with inductive interface

The IWM-MB4 is a wired M-BUS module for Woltmann meters, suitable for remote reading applications in a commercial and industrial context. This M-BUS module allows the meter consumption data collecting by using the standard Wired M-BUS protocol, historically developed for remote meters reading.

The use of an inductive target into the meter dial excludes the possibility of magnetic fraud and makes the application insensitive to the pipes vibrations.

The IWM-MB3 is compatible with all the pre-equipped multiple jet meters (wet, semi-dry and dry dial).

Consumption analysis with reverse flow compensation

Fraud detection (removal of the module, external magnetic field tampering, reverse flow, water leakage). All the alarms are recorded and reported into the M-BUS telegram sent by the module.

IP68 protection* allows the installation of the module even in harsh environments.

NFC interface allows configuration and commissioning of the device with the use of a simple smartphone app.


Technical Features

Protocol MBUS EN 13757-2\3
Cable length 1.5 meters
Compatible water meters WDE-K50
Sensitivity measure 10 liters (up to DN125) or 100 liters (from DN150)
Reverse flow Activate for the backward flow amount after user-settable threshold
Energy supply Non-replaceable lithium battery, rechargeable (automatic recharge from the BUS network). Backup for measuring function in absence of BUS voltage
Transmitted data Volume (consumption), alarms
Alarms Discharged battery, module removal, magnetic fraud attempt, backward flow, leakage detection.
Protection class IP68*
Weight 151 g
Size (l x p x h, cable excluded) 100 x 100 x 25 mm
Working temperature +1° / +55°C
Module programming requirements Android device (smartphone, tablet, etc.) with an NFC interface and the NFC IWM Config APP freely downloadable from GOOGLE PLAY.

Any M-BUS level converter and Windows PC with B M-BUS software installed (or other M-BUS software**).

* IP68: maximum 24 hours of continuous submersion at 1 m depth

** Ask to your dealer about the software compatibility

Compatible with

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