Liquid-phase H2S sensor

Detect elevated H2S levels in aquaculture early

The SulfiLogger™ H₂S sensor’s continuous, liquid-phase measurements detects elevated H₂S levels early – enabling RAS aquaculture operators to react in time before the challenge impacts fish health.

Continuous data

Detect rising hydrogen sulfide levels early and react in time.

Liquid-phase measurements

Measure directly in the untreated water to get reliable insights.

Measure anywhere

Measure anywhere at RAS facilities to get exactly the data, you want.

protect your investment

Identify rising H2S levels & react before fish health is impacted

H₂S is a critical risk in RAS aquaculture systems, where elevated levels can stress fish, impact growth, and in severe cases cause mortality events.

Continuous, liquid-phase H₂S monitoring provides early warnings of rising levels that spot measurements cannot deliver, allowing operators to detect developing issues such as saturated biofilters and take action before fish health is affected.

Learn more

Read more about the sensor and its other use-cases.

Product

SulfiLoggerTM H2S sensor

The SulfiLogger™ H2S sensor is a robust probe designed for continuous monitoring in rough environments including wastewater, aquaculture, and process gases.

Click the button to read more details including full product specifications.

Product details

Case studies

Read how other companies have benefited from data-driven sulfide control.

Read cases

Webinars

Watch webinars about smart H2S dosing control techniques.

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Product

SulfiLoggerTM H2S sensor

The SulfiLogger™ H2S sensor is a robust probe designed for continuous monitoring in rough environments including wastewater, aquaculture and process gases.

Click the button to read more details including full product specifications.

Product details

Trusted by the industry

The SulfiLogger™ sensor is in operation in +30 countries world-wide.

  • "After struggling with H₂S meters that couldn't handle moisture, the City of Grand Rapids WRRF switched to SulfiLogger.

    We now receive consistent, reliable readings, allowing us to monitor our digesters and H₂S removal media effectively. We’ve had great success with these sensors and recommend them to any facility dealing with high-moisture processes."

    City of Grand Rapids, MI
    Wastewater Operations & Maintenance Supervisor

  • "We are very satisfied with the sensor. The reliable measurement results are available to us in real time and help us to control our production efficiently and safely."

    Thyssenkrupp Electrical Steel GmbH
    Dr. Jan Mundry, Scientific Associate

  • "After installing a SulfiLogger sensor for liquid-phase measurements, we now have reliable insights into how industrial sewage discharges affect H₂S levels in the collection system."

    Energi Viborg
    Gerhard Wirenfeldt, Technical Coordinator

  • "The sensor is used in our laboratory to measure and test filter performance, helping us optimise the lifetime and effectiveness of our filters.

    The SulfiLogger sensor has significantly simplified and improved our data collection when performing H₂S tests on filters."

    Camfil AB
    Laboratory Engineer

  • "By installing SulfiLogger sensors in odor control systems in wastewater applications, we can continuously evaluate H₂S removal efficiency.

    This has improved process transparency, optimised filter operation, and enhanced overall system reliability."

    Dimtech S.A.
    Theocharis Sideris, Environmental Engineer

  • "We used to take tube measurements when something didn’t seem right, but it only gave us snapshots - not the full picture.

    With the SulfiLogger sensor’s continuous data, we now have a watchdog that alerts us if something is off. It helps us to react fast and optimize carbon filter performance, so we e.g. don’t change media too early or risk running it for too long."

    Vesthimmerland Biogas (BioCirc)
    Flemming Nielsen, Production Manager

  • "We have 4 Sulfiloggers in operation across our wastewater system. Two are used to optimise iron(II) chloride dosing in pressure pipelines, while the other two are used to monitor H₂S levels and support testing of microorganisms in the sewer system.

    Overall, the Sulfiloggers are an excellent operational tool. The data quality is outstanding, maintenance is extremely easy, and after more than a year of continuous operation, we have not noticed any significant wear."

    Wolfburger Entwässerungsbetriebe
    Thomas Rechlin, Head of Department for Treatment Plants and Pumping Stations

  • "We use two SulfiLogger sensors (one placed in the liquid and one in the air) to investigate a location, where we have a suspicion of elevated H₂S levels.

    The measurement data is crucial for assessing the severity of the problem and selecting the appropriate solution. If the results confirm our suspicions, we will explore the possibility of a filtration solution or other relevant mitigation measures.

    After this project, we plan to relocate the sensors to other locations within the sewer network where hydrogen sulfide also is suspected."

    SonFor
    Thor Krogh Harfot, Maskinmester

  • "We have successfully deployed SulfiLogger sensors across diverse applications, including drinking water reservoirs, irrigation wells, industrial and municipal wastewater systems, and landfill leachate.

    The technology has proven consistently reliable, delivering accurate, real-time sulfide data that enhances system understanding and supports process optimization. The sensors’ robustness and durability under varied field conditions have been particularly impressive."

    Nanoplus Limited
    Raphi Mandelbaum, Managing Director

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