The technology behind the SulfiLoggerTM solution directly addresses the market needs by providing a game changing H2S sensor that significantly contributes to solve economic and environmental sustainability issues.

The SulfiLoggerTM sensor is based on the electrochemical principles used in Unisense’s scientific handmade glass H2S sensor product range. On request from industrial users, the sensor technology has been further developed into a product, which is factory calibrated and able to withstand the harsh environments of sewage networks, gas producing facilities and biogas.

The new SulfiLoggerTM sensor is the first affordable and functional sensor on the market able to continuously quantify dissolved H2S as well as H2S gas in an anaerobic environment and in high concentrations.

In the SulfiLoggerTM sensor, H2S penetrates a silicone membrane at the tip of the sensor body and is subsequently electrochemically oxidized whereby the concentration can be measured as a current. The microsensor design operates with currents in the pA-range, which has several advantages such as:

  1. ability to operate continuously under oxygen-free conditions
  2. tolerance of all ranges of H2S concentrations
  3. can measure both in gas and liquid phase

Collected data can be sent directly to the SCADA system. The sensor has all the electronics and datalogger built-in, and several power supply solutions are available. The sensor is a consumable and needs to be replaced after a number of months of continuous operation. At Unisense we care about the environment, and we are keen about circular economy. Therefore, we have established a refurbishment program where up to 80% of the sensor materials are reused once the sensor is returned to us for exchange. This also provides a price discount to customers.

The predecessors of the SulfiLoggerTM sensors, our handmade H2S sensors, are already used in several research centers: e.g. Stanford University, University of Southern California, Massachusetts Institute of Technology.

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