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B-meters IWM-TX3 Wireless M-BUS radio module GMDM-I, GMB-I, GMB-RP-I and CPR-M3-I

The IWM-TX3 is a WMBUS radio module for the transmission of consumption data that is compatible with the GMDM-I, GMB-I, GMB-RP-I, and single jet mod series of multijet water meters. CPR-M3-I.

In addition to providing data on recent consumption and a history of up to 12 months, it also enables the detection of potential water leaks downstream of the meter, prolonged operation at maximum flow rate (Q4), and various sorts of attempted meter fraud.

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  • Technical Features

Radio interface

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


500 m*

Compatible water meters


Pulse output minimum value (K)

1 liter


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



124 g

Size (l x p x h)

88 x 75 x 60 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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