Long-life battery powered cellular IoT data logger for pulse meters, M-Bus meters and 4-20mA or 0-10V analog sensors
Robust, ultra low-power cellular IoT data logger, which comes with a built-in LTE Cat.M, NB-IoT cellular module ensuring reliable data transfer in any environment.
The device can be connected to two sensors due to its analog inputs (4-20mA or 0-10V).
Easily upgrade existing meters and sensors with cellular connectivity, safeguarding your investments without the need for costly replacements!
Offering a standalone operation, it performs reliable automated sensor or meter readings. The device allows connection of 2 analogue sensors through its inputs.
The WM-i ANALOG device receives and collects signals of connected two sensors, then it transfers all data at predetermined intervals to the Microsoft® Azure IoT platform with MQTT protocol and TLS encryption through the LTE Cat.M / NB-IoT network.
| Device type | IoT data logger for meters, sensors |
|---|---|
| Primary use case | Smart water and gas metering (AMI/AMR), LTE and Cat.M upgrade of legacy meters |
| Cellular & RF Access Technology | LTE Cat.M/NB / 450 MHz; 2G fallback |
| Protocols | IEC, TCP, M-Bus, MQTT (with Azure compatible mode) |
| Interfaces, Physical Connectors | Pulse, M-Bus, 4-20mA (analog), 0-10V (voltage), USB-C |
| Server | IoT Cloud, Azure Cloud |
| Meter compatibility | Pulse output meters, M-Bus meters and sensors, meters and sensors with 4-20mA output, meters ans sensors with 0-10V voltage output |
| Power & Environment | internal DC battery with 19,000mAh capacity / optional external battery pack — between -25 Celsius and +70 Celsius degree |
| Approvals & Certifications | CE, RoHS, ReD DA, IP 68 Protection |
| Firmware | ThreadX (RToS embedded system) |
| Configuration / Remote Management | WM-E Term configuration software (downloadable) via local or TCP / Azure IoT Cloud |
| Security | TLS, SHA-256, Tamper protection |
The easily installable device was designed for long-term, maintenance-free operation, the WM-i ANALOG boasts a high-capacity battery lasting up to 10 years and an IP68 waterproof casing, making it ideal for challenging environments.
Optionally, add-on extension possibilities are available to extend capabilities for PoCs, unique orders (e.g. different connections, adding sensors).
The WM-i ANALOG data logger is delivered with one high-capacity 19,000 mAh battery included. This provides long-lasting, reliable operation even in demanding applications.
For extended autonomy, the logger can be ordered with an optional external battery pack. This pack contains three additional 19,000 mAh batteries, giving you a total of four batteries (1 internal + 3 external).
If you decide to add the external battery pack later, we recommend also replacing the internal battery with a new one. This ensures all four batteries are at the same charge level, which is important for optimal performance and long-term reliability.
Datasheet
Updated: 2025-11-14
User Manual
Updated: 2024-11-18
WM-E Term configuration software (WM-i compatible)
Updated: 2025-12-04
Video tutorial – Chapter 1. How to configure the WM-i data logger in Azure with the WM-E Term software
Extra Battery Pack for WM-i Data Loggers: Extend the lifetime of your IoT smart metering device
4G LTE antenna with magnetic mount, SMA connection, 2.5m long RG174 cable, 6dBi max. gain
