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Enabling better global research outcomes in soil, plant & environmental monitoring.

WLM Water Level Meter

The ICT Water Level Meter (WLM) is a rugged, self-contained, standalone logger designed to collect and transform data from SDI-12 sensors, the WLM is able to receive up to 255 parameters from a maximum of 62 individual sensors via Combined Instrument Software (CIS). Designed to allow easy access to the collected data, the WLM Logger stores data on an internal MicroSD card for retrieval either using the USB port, 2.4GHz wireless network, or when combined with the ICT International Telemetry hub via the mobile phone or Iridium satellite networks.

Configuring the WLM using CIS, the user has the ability to enter a reference water level, thereby allowing logged levels to be referenced to local or national datum points for surface water monitoring, or depth to water for groundwater monitoring.

The WLM converts recorded level into flow rates or volumes based on user defined parameters:

  • Rating table
  • Conditional power equations
  • Polynomial equation

The WLM can be factory optioned to support analogue and 4 – 20mA sensors.

Collected data is stored on an easily removable internal MicroSD card in CSV format, allowing a user to either take the card out and read the data file directly on their PC or connect directly to the WLM via a USB cable. Remote access using either a 2.4GHz wireless network – over distances up to 4km depending on setup and environmental conditions – or in combination with the ICT International Telemetry Hub (utilising either a 3G mobile phone or the Iridium Satellite network), data can be transferred wirelessly and uploaded to the cloud-based data server.

The ICT International Combined Instrument Software (CIS) provides an intuitive interface for viewing live measurements, downloading logged data and configuring sensors. Powered by an internal Li-Po battery, the WLM is kept charged by directly connecting a solar panel to the logger. When charging via a solar panel, the battery charge rate is automatically matched to available sunlight and battery status.
The ICT Water Level Meter provides a data collection solution for catchment wide water level and flow monitoring applications.

  • Input level offsets to reference water level to an elevation or local datum point.
  • Depth to groundwater level logging capabilities.
  • Load flow rating tables and equations to output real-time flow data.
  • Input storage rating curves for real-time storage volumes.
  • Live data-view for monitoring pumping drawdown rates in groundwater sampling.


SDI-12 Option

Data Storage and Transfer:
  • CSV files, FAT32 MicroSD/SDHC cards up to 32GB.
  • USB 2.0 Full Speed (12Mbps)
SDI-12 Communication Protocol
  • Connect with up to 10 devices, or more depending on application.
  • Compatible with SDI-12 Specification 1.3
Concurrently handles Sensors with:
  • Result Output (aR!)
  • Measurement Command (aM!)
  • Concurrent Measurement Command (aC!)
Logging Rate: From once per second to once per day using:

  • Sub minute measurement intervals (1s – 60s)
  • Standard measurement intervals (1m – 60m)
  • Custom measurement intervals (up to 24 custom measurement times)
Channels: Up to 250 channels, including:

  • Direct sensor readings
  • Converted sensor readings
  • Virtual channels
Bus Power Management: Bus Power Modes:

  • Power down after measurement
  • Always on Bus monitoring:
    • Bus current monitoring and logging
    • Bus voltage monitoring and logging
Power Supply:
  • Internal Lithium Polymer (LiPo) battery
  • Rechargeable via:
    • 20W Solar Panel charge rate automatically adjusts depending on available sunlight
    • ICT International CH24 24 Volt Power Supply
  • Extruded hard anodised aluminium body
  • UV, moisture, and impact resistant endcaps
  • 316 stainless steel external fasteners
  • Sealed service hatch provides access to power switch, USB connection and MicroSD card


Voltage Option

Instrument Logging

Analogue Channels 10 single ended
Input Voltage Channels 1-5: 10V; Channels 6-10: 2.5V.
Resolution 0.00001V—24-Bit
Accuracy 0.001V
Minimum Logging Interval 1 second
Delayed Start Suspend Logging, Customised Intervals
Sampling Frequency 10Hz


Communications USB, Wireless Radio Frequency 2.4 GHz
Data Storage MicroSD Card, SD, SDHC & SDXC Compatible (FAT32 format)
Software Compatibility Windows 8 & 8.1, 10. Mac OS X
Data Compatibility FAT32 compatible for direct exchange of SD card with any Windows PC
Data File Format Comma Separated Values (CSV) for compatibility with all software programs
Memory Capacity Up to 16GB, 4GB MicroSD card included.

Operating Conditions

Temperature Range -40°C to +80°C
R/H Range 0-100%
Upgradeable User Upgradeable firmware using USB boot strap loader function


Internal Battery Specifications
960mAh Lithium Polymer, 4.20 Volts fully charged
External Power Requirements
Bus Power 8-30 Volts DC, non-polarised, current draw is 190mA maximum at 17 volts per logger
USB Power 5 Volts DC
Internal Charge Rate
Bus Power 60mA – 200mA Variable internal charge rate, maximum charge rate of 200mA active when the external voltage rises above 16 Volts DC
USB Power 100mA fixed charge rate
Internal Power Management
Fully Charged Battery 4.20 Volts
Low Power Mode 3.60 Volts – Instrument ceases to take measurements
Discharged Battery 2.90 Volts – Instrument automatically switches off at and below this voltage when no external power connected.
Battery Life varies
Example A: With a recommended solar panel and/or recommended power source connected, operation can be continuous.
Example B: Power consumption is dependent on number and type of sensors connected, frequency of measurement and measurement duration


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