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CO₂ FT – Carbon dioxide sensor for flow-through applications

The CONTROS HydroC® CO₂ FT is a unique surface water carbon dioxide partial pressure sensor designed for underway (FerryBox) and lab applications. Fields of application include ocean acidification research, climate studies, air-sea gas exchange, limnology, fresh water control, aquaculture/fish farming, carbon capture and storage - monitoring, measurement and verification (CCS-MMV).

Individual 'in-situ' calibration

All sensors are individually calibrated using a water tank which simulates the deployment temperature. A proven reference flow through system is used to verify the CO₂ partial pressures in the calibration tank. High quality standard gases are used to calibrate the reference system before and after every sensor calibration. This process ensures that the CONTROS HydroC® CO₂ sensors achieve excellent short and long term accuracy.

Operating principle

Water is pumped through the flow head of the CONTROS HydroC® CO₂ FT sensor. Dissolved gases diffuse through a cus¬tom made thin film composite membrane into the internal gas circuit leading to a detector chamber, where the partial pressure of CO₂ is determined by means of IR absorption spectrometry. Concentration dependent IR light intensities are converted into the output signal from calibration coefficients stored in firmware and data from additional sensors within the gas circuit.


  • High accuracy
  • Fast response time
  • User-friendly
  • Long-term maintenance interval of 12 months
  • Long-term deployment capability
  • 'Plug & Play' principle; all required cables, connectors and software are included
  • The CONTROS HydroC® technology has a track record in peer-reviewed scientific publications


  • Range/Full-scale can be user-configured
  • Data logger
  • Easy deployment together with a CONTROS HydroFlash® O₂

Services and support

  • 24/7 Technical support

    Our 24/7 technical support team is there to help at any time, day or night, wherever your vessel is.

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  • Spares

    We understand the importance of having the right parts, available in the right place, at the right time.

  • Training

    Ensure that your crew is properly and thoroughly trained. This will reduce operational risk, downtime and maximise return on asset investment.