LTE Cat.M1/NB2 Data Logger for Smart Water Metering

Low power mobile data logger – pulse signal counter, M-Bus data collector and Cat.M / Cat.NB transmitter – for smart water metering with long-life battery

Wireless transmitter
Wireless transmitting
Water metering
Water metering
Utility meters
Residential meters
Cat.M1/NB2, 2G
Pulse input
3x pulse inputs
MBus input
MBus input

Our 3rd generation low-power cellular data logger with a built-in cellular modem for smart water and gas metering.

Automated water meter readings with customizable breakdowns, leak detection and prevention. Detection of water leakages to avoid flooding, non-revenue water for more accurate billing, optimization of operating costs, and improvement of water supply reliability.

Remote data collection via the pulse output (S0) or M-bus. Data is sent through NB-IoT cellular networks (as LTE Cat.NB / Cat.M) to a central server or HES (Head-end System).

This smart water metering device has a standalone and intermittent operation.

It reads and counts the consumption data (pulse signals or M-Bus data) of the connected meters in „sleep mode” and saves the data to the local storage. Then it wakes up at pre-configured intervals to transmit the stored data using MQTT or LwM2M protocol, plain TCP/IP packets or JSON, XML format.

The device has an IP67 waterproof housing. The installation is easy, which is supported by operation LED lights to indicate proper functioning.

Optionally, expansion boards can be ordered to extend capabilities (e.g. more inputs, M-Bus connection, etc).

The modem has a special internal battery which provides energy for 5 to 10 years.

With the over-the-air (OTA) protocol, the device can be configured and the firmware can be updated remotely without the need to send experts to the field.


Main Features

  • LTE Cat.M / Cat.NB / 450MHz cellular module
  • Continuous counting of pulse signals (S0)
  • M-Bus data collection (order option)
  • IP67 waterproof design, mountable
  • External antenna with coaxial cable
  • Operation LEDs for installation
  • Internal battery for more than 5 years of lifetime
  • Scheduled data sending via LTE Cat.M / Cat.NB / Cat.M 450MHz network
  • Data sending (protocol and format by user selection: MQTT, LwM2M, TCP/IP, etc.)
  • Safe local storage of consumption data, TLS certificate
  • Alert notifications from: tamper switch, battery status, Min/Max flow unit per time (leak, excessive flow / fault), acceleration/movement (optional theft prevention)
  • WM-E Term configuration software




  • IP67 protected, mountable enclosure (by casing pedestal)
  • Optional add-on boards (more inputs, Mbus feature)
  • LTE Cat.M / Cat.NB / 450MHz cellular module
  • Internal micro SIM (3FF)



  • Universal connection for energy meters, sensors (input for pulse signal capable meters)
  • Wired M-Bus meters (optional)
  • Internal serial connection (for local configuration)
  • DC powered internal battery (external DC power usage option)
  • External antenna on coaxial cable – leaded out from the product enclosure



    • Autonomous, automated and intermittent operation
    • Data storage and sending intervals can be pre-configured
    • Messages can be sent using MQTT or LwM2M protocols, plain TCP/IP packets or JSON, XML format



    • Safe local storage of consumption data (AES-256 security hash algorythm)
    • TLS certificate
    • Alert notifications from: tamper switch, battery status, Min/Max flow unit per time (leak, excessive flow / fault), acceleration/movement (optional theft prevention)


    Technical data



    Quick Guide

    User Manual

    MQTT Protocol Description

    User Manual – LwM2M Settings

    WM-E Term configuration software (WM-I3 compatible)

    MQTT, LwM2M, TCP protocol compatible sample configuration file for WM-E Term (compressed ZIP file, extract the CFG file)

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