On-line carbon dioxide sensor CONTROS HydroC® CO₂

dissolved CO2

The CONTROS HydroC® CO₂ sensor is a unique and versatile subsea / underwater carbon dioxide sensor for in-situ and online measurements of dissolved CO₂. The CONTROS HydroC® CO₂ is designed to be used on different platforms following different deployment schemes. Examples are moving platform installations, such as ROV / AUV, long-term deployments on seabed observatories, buoys and moorings as well as profiling applications using water-sampling rosettes. INDIVIDUAL ‘IN-SITU’ CALIBRATION All sensors are individually calibrated in a water tank which simulates the deployment temperature. A sophisticated reference detector is used to verify the p CO₂ concentrations in the calibration tank. The reference sensor is recalibrated with secondary standards on a daily basis. This process ensures that the CONTROS HydroC® CO₂ sensors achieve unmatched short and long-term accuracy. OPERATING PRINCIPLE Dissolved CO₂ molecules diffuse through a custom 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. • Analogue output: 0 V – 5 V • Internal data logger • External battery packs • ROV and AUV installation packages • Profiling and mooring frames • External pump (SBE-5T or SBE-5M) • CO₂ flow through sensor for underway (FerryBox) and lab applications