IWM-TX3 has been designed to allow wireless remote reading in different types of applications from the residential sector to the commercial and industrial sectors.

The radio module thanks to the presence of the inductive target into the meter dial allows the reading of the volume consumption without any constraints of access to the site in walk-by mode or AMR (automatic meter reading), in respect of the WMBUS standard and complying with the OMS (Open metering system) specification.


Radio interfaceW-Mbus EN13757-4 @868 MHz ≤ 25 mW, mode T1
Coverage500 meters*
Compatible water metersGMDM-I, GMB-RP-I, GMB-I
Pulse output minimum value (K)1 liter
ConfigurationVia radio (with RFM-RX2 and software B Metering), NFC (with Android app)
Energy supplyNon-replaceable lithium battery, maximum lifetime 10 years**
Protection classIP68***
Weight124 g
Size (l x p x h)88 x 75 x 60 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 requirements• Android device (smartphone, tablet, etc.) with an NFC interface and the NFC IWM Config APP freely downloadable from GOOGLE PLAY • RFM-RX2 receiver and Windows PC with B Metering software installed

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


Example of installation on mod. GMDM-I