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B-Meters IWM-TX4 Wireless M-BUS radio module WDE-K50

For use with the Woltmann water meter series, model WDE-K50, the IWM-TX4 is a WMBUS radio module for the transfer of consumption data.

In addition to current consumption and a history of up to 12 previous months, it detects several sorts of attempted meter fraud, prolonged operation at maximum flow rate (Q4), and the presence of a probable water leak downstream of the meter.

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  • Features
  • Technical
  • Analysis of consumption using reverse flow compensation that ensures constant perfection of alignment between the counter and the counter clock.
  • Fraud prevention (removing the radio module, using an external magnetic field, switching the flow, and identifying a system failure).
    Magnetic counter tampering and removal are noted and broadcast via radio to the receiving system.
    An additional register that enables the calculation of the amount of water passed in reverse keeps track of the existence of reverse flow. If a timely update is desired, the loss function can be monitored at the time of reading or by the AMR system.
  • The module can be used for meters deployed in challenging environments thanks to IP68 protection*.
  • NFC connectivity enables programming and commissioning of the device using a straightforward smartphone app.

Radio interface

W-Mbus EN13757-4 @868 MHz ≤ 25 mW, mode T1


500 m*

Compatible water meters


Pulse output minimum value (K)

10 liters (up to DN125) or 100 liters (from DN150)


Via radio (with RFM-RX2 and software B Metering), NFC (with Android app)

Energy supply

Non-replaceable lithium battery, maximum lifetime 10 years**

Protection class



167 g

Size (l x p x h)

100 x 100 x 57 mm

Working Temperature

+1° / +55°C

Transmitted data

Volume (consumption), total of backward flow, 12 monthly historical values, battery status, alarms


Discharged battery, module removal, magnetic fraud attempt, backward flow, leakage detection

Module programming requirements

Android 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 the configuration process, and on the environmental conditions

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