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Observator 100 years

Compact online salinity measurement

Salination of rivers, groundwater and inland waters is a growing problem in many countries. The ‘online salinity measurement’ described here provides a very economical way to quickly detect salt intrusion and to monitor the salt concentration over time.

The whole setup merely consists of two components: a data logger and a sensor, connected by a cable. These can be mounted on, for example, a pole. The pole can be placed in a pond or stream or similar. Mounting on a weir, a pumping station or any other structure is also very easy.

The data logger is equipped with an internal modem and antenna. The acquired measurement data is directly transferred over the cellular network to your or our server. This way you have direct online access to your data. The logger also contains an integrated solar panel and a rechargeable battery, making a connection to mains power unnecessary. This greatly simplifies the installation work!


  • Can easily be placed by a single person.
  • Measures conductivity and temperature of the water.
  • Measures the salinity (derived from conductivity and temperature).
  • Uses 4-electrode measurement. This is suitable down to very low salinity values.
  • Uses the state-of-the-art LTE-M IoT network. This is very reliable and has good performance. (GPRS version is also available).
  • Data is directly available online.
  • Completely integrated solution with just two components and a cable. No separate antenna, solar panel or battery needed.


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