Hydro-Logic® Flexi Logger 105
Data, insight and analysis

Hydro-Logic Flexi Logger 105

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Accurately monitor and record more data, using less power for flow, level, weather and quality applications in remote areas, or where there is no permanent power supply.

The Hydro-Logic® Flexi Logger 105 is a compact and robust monitoring and telemetry logger which uses a 4G modem and is based on the faster ARM processor. 

The interface includes protected Wi-Fi access allowing engineers to configure the FL105 logger without the need for cable attachments.

Need support? Visit our Smart Monitoring Support page


The Hydro-Logic® Flexi Logger 105 is a flexible data logger that can be paired with a large range of sensors to monitor and measure a variety of metrics, including water flow, level, quality and weather.  This data can be used to provide local flood warning, reservoir level and environmental monitoring.  

The Hydro-Logic® Flexi Logger 105 uses 4G modem with a faster ARM processor in a robust IP68 casing, to provide reliable and accurate monitoring and data telemetry.  

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4G modem

The Hydro-Logic® Flexi Logger 105 uses a 4G modem that supports the new mobile network technologies  (Long-Term Evolution technology (LTE) (NB-IoT and CAT M1))

ARM processor

The Hydro-Logic® Flexi Logger 105 operation is based on the latest development in low power processor technology, the ARM processor, helping to ensure a long service life.

Fast reconfiguration, no cables required

The interface includes protected Wi-Fi connection to enable engineers to configure the unit without cable attachments.

Direct data transfer

Transfer data direct to your server via FTP, or transfer data to Hydro-Logic® Timeview using Wi-Fi where available.

Easy to upgrade from the Hydro-Logic® Flexi Logger 100

The Hydro-Logic® Flexi Logger 105 is very similar in size to FL100 model so will fit easily into our standard pole top enclosure.  The pre-drilled holes in the fixing bracket are also located in the same place as for the FL100 model. 

The Hydro-Logic® Flexi Logger 105 is also compatible with the same sensors as the FL100 model.

Hydro-Logic Smart Monitoring - how it works diagram

  1. Hydro-Logic® data logger monitors water flow, level or quality.
  2. Data is transmitted electronically
  3. Data is received by Hydro-Logic® Timeview or received by Client’s SCADA system.
  4. Hydro-Logic® Timeview displays the data and/or generates alerts.
  5. Data may be passed on to a Hydro-Logic® Timeview Dbi, Hydro-Logic® Aquator or AQUARIUS Time-Series database for storage and analysis.


Model Specific Features

  • Wide variety of user-configurable applications, including level, flow, weather and water quality
  • ARM based logger provides faster processing
  • 32 channels as standard - double that of the 100 model
  • Four alarm thresholds on each channel
  • Uses a 4G modem that supports Long-Term Evolution technology (NB-IoT and CAT M1). 2G fallback included
  • Improved user interface allows for protected Wi-Fi configuration without the need for cable attachments
  • Compatible with Hydro International standard pole top casings so upgrades to existing sites are straightforward
  • Pre-configured for instant connection to web-browser-based telemetry
  • Easy set-up, local or remote, using Harvest software or via browser-based telemetry
  • Switched 12 Volt DC output for powering sensors
  • On-board diagnostics (signal, battery and sensor monitoring)
  • Long battery life, field-replaceable, typically 5 years service
  • External power-source capability
  • Configurable sample rate, 10 seconds to 12 hours
  • Industry-standard input capability Analogue, Digital and SDI-12
  • Rugged, environmental protection to IP68
  • Rapid installation using pole top (PT) enclosure

  • Hydro-Logic® Flexi Logger 105
  • Battery for Hydro-Logic® Flexi Logger 105

How do I change the battery?


The design of the Hydro-Logic® Flexi Logger 105 ensures that the battery or the SIM card can be safely changed with no risk to delicate components. To access the battery chamber, please follow the instructions in the product manual or watch our video guide.


What are the advantages of using a 4G modem?


The 4G modem supports LTE (Long-Term Evolution) mobile network technology (NB-IoT and CAT M1) which is currently being deployed around the world.


How easy is it to upgrade from the Hydro-Logic® Flexi Logger 100 to the Hydro-Logic® Flexi Logger 105?


It’s easy to upgrade as both models are very similar in size – the Hydro-Logic® Flexi Logger 105 will fit into our standard pole top enclosure.  The Hydro-Logic® Flexi Logger 105 is also compatible with the same sensors as the FL100 model.

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