Multi-Channel GDL

Communication & Datalogging Attachment
  • Converts analog signals into digital signals
  • 7 standard channels
  • Integrated datalogger collects over 25,000 records
  • Modbus® and SDI-12 protocols

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The GDL is a plugin that can make many of your existing sensors into Smart Sensors.

With a simple attachment, the GDL adds datalogging and powerful communication features to your equipment. Whether your devices are analog or digital, our GDL dataloggers turn your them into telemetry-enabled recording systems.


  • Converts analog signals into digital signals
  • 7 standard channels: two temperature (thermistor), one milli-volt, two voltage, two 4-20 mA
  • Up to eight digital channels, depending on configuration
  • Over 25,000 records in non-volatile memory
  • Modbus® and SDI-12 protocols
  • RS485 network
  • Rugged control box—polycarbonate (IP67)
  • Small size—5.5″ x 3.1″ x 2.6″ (excluding connectors)
  • Internal 12 VDC power supply (external power supplies available)
  • Programmable warm-up time
  • Standard or user-defined units
  • Includes Aqua4Plus control software for setting up flexible recording sequences, retrieving data, monitoring real-time data, and viewing collected data


  • Stormwater discharge monitoring
  • Water quality monitoring
  • Irrigation control
  • Stream gauging
  • Wetland monitoring
  • Well, tank, tidal levels

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