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B-meters IWM-PL4 Electronic pulse emitter module WDE-K50

The Woltmann water meter series, model WDE-K50, is compatible with the non-magnetic pulse emitting module (IWM-PL4), which has a wide range of applications for remote reading in residential, commercial, and industrial settings.

It enables the integration of sophisticated counting and fraud detection features, allowing third-party systems with a universal interface to acquire meter consumption data.

By using an inductive target on the meter, magnetic fraud is eliminated and the application is rendered insensitive to pipe vibrations.

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  • Features
  • Technical Features
  • For a constant flawless alignment between the counter and counter clock, consumption analysis (with incremental and decremental counting) and reverse flow compensation can be activated.
  • Examining frauds (reverse flow, application of an external magnetic field, and cable cutting and removal).
  • An specialized impulse contact can be used to check for reverse flow.
  • Available for industrial applications is a dedicated dosing function.
  • The module can be used for meters located in difficult situations thanks to IP68 protection*.
  • High configuration flexibility is provided by the NFC interface, which also enables setting the output pulse ratio independently via a smartphone app (available ratio values include multiples of the index value) and configuring the output pulse duration in accordance with the sensitivity of the acquisition system.

Output signal

Supply: maximum 30VDC (100mA) Type: polarized open-collector

Cable length

1.5 meters (4 conductors)

Compatible water meters


Pulse output minimum value (K)

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

Energy supply

Non-replaceable lithium battery, max lifetime 10 years*

Protection class



160 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 a NFC interface and the NFC

IWM Config APP freely downloadable from GOOGLE PLAY

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.


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