The COMLog 2 range of data loggers are typically used for monitoring applications regarding meters, flowmeters or other instruments equipped with pulse transmitters.

However, the option of Modbus or SDI12 digital inputs makes it possible to use in many other applications.

These very economical data loggers are equipped with the latest generation LTE-M/NBIoT cellular modems and offer great autonomy due to their internal batteries.


  • Remote reading of water or energy meters equipped with pulse transmitters
  • Monitoring of any instruments delivering a voltage-free digital signal, with the option of accumulative pulse counting (see the case study presented below for rain gauge monitoring).
  • Monitoring of digital sensors or instruments with Modbus or SDI12 serial communication (see the case study presented below for the supervision of meteorological data: temperature, humidity, solar radiation...).
  • Numerous other applications depending on connected sensors

Main benefits

  • Very economical product given the different possibilities offered
  • Works on the new LTE-M/NBIoT cellular networks that offer:
    — better communication in difficult locations (e.g., manholes under the road)
    — reduced energy consumption
  • Flexibility to adapt to a wide variety of applications
  • Long battery life (ranging from 3 years to more than 5 years for most applications)
  • Possibility of power supply from solar panels or other low-voltage source
  • Waterproof IP68 (submersible), stainless steel 316 connectors
  • High level of security of communications, with SMS backup in case of reduced availability on the Data IP channel of the networks.
  • Configurable remotely
  • Advanced measurement, processing and alarm management functions. Examples of advanced functions:
    — Acceleration of measurements and transmission frequencies during alarms
    — Alert for high/low threshold, for measurement variation, for minimum night flow value, etc.
    — Calculation of minimum, maximum, average values, counts...


  • Dimensions (H x W x D): 84 x 114.5 x 113.3 mm (3.3 x 4.5 x 4.46 '')
  • Weight: 570 g
  • Reinforced ABS housing
  • Operating Temperatures: -20 to +60°C (-5 to +140°F)
  • Powered by long-lasting internal batteries (replaceable by the user)
  • Possibility of primary power supply by 12V source (batteries used as backup in this case)
  • Low battery warning
  • IP68 waterproof (submersible)
  • Integrated cellular modem LTE-M/NBIoT
  • Data and alarm transmission through Data IP and backup via SMS
  • Logging capacity: 2 million timestamped data readings
  • Configurable sampling rate (1 sec to 24h), with possible acceleration during alarms
  • Inputs/Outputs available (depending on models) :
    — mono or bi-directional counting inputs (up to 64 Hz)
    — digital ON/OFF inputs (level floats, rain gauges...)
    — digital serial inputs Modbus, SDI12, RS232
  • Programmable locally via USB cable (IDT software provided) or remotely from Datagate platform

Related products

  • Various compatible sensors and instruments
  • Cellular antennas: different models and lengths of cables available according to your needs (manhole antennas, buried antennas, external antennas on walls or poles...)
  • USB communication cable
  • Associated software, in Cloud Hosting mode or installed on your own network:
    — TopKapi Vision
    — DataGate
  • Various accessories:
    — Mounting brackets
    — Cables with waterproof connectors for instrument connection

Related pages


COMLog 2
COMLog 2
COMLog 2, in the field
COMLog 2, in the field
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