The IWM-TX4 is a Wireless M-BUS module using the EN13757-4 transmission protocol according to the OMS specifications (Open metering system) for WDE-K50 Woltmann water meters.

Used for consumption data remote reading in households, commercial and industrial applications, it allows the connection of the meters to wireless networks that use the standard WMBUS protocol.

Coupled with an inductive index that excludes the possibility of magnetic fraud attempts making it insensitive to piping vibrations.


Radio interfaceW-Mbus EN13757-4 @868 MHz ≤ 25 mW, mode T1
Coverage500 meters*
Compatible water metersWDE-K50
Pulse output minimum value (K)DN50-125 10 liters, DN150-200 100 liters
ConfigurationVia radio (with RFM-RX2 and software B Metering), NFC (with Android app)
BatteryNon-replaceable lithium, maximum battery life 10 years**
Protection classIP68***
Weight200 g
Size (l x p x h)88 x 70 x 50 mm
Working Temperature+1° / +55°C
Transmitted dataVolume (consumption), total of backward flow, 12 monthly historical values, battery status, alarms.
AlarmsDischarged battery, module removal, magnetic fraud attempt, backward flow, leakage detection.
Module programming requirementsAndroid device (smartphone, tablet, etc.) with an NFC interface and the NFC IWM Config APP freely downloadable from GOOGLE PLAY

* In optimal signal transmission conditions ** The battery life strongly depends on the working time window, set during