Consider an RBRconcerto³ C.T.D.DO logger, where the DO channel is a RBRoptode. The RBRoptode transfers both the foil temperature and the dissolved oxygen concentration (not compensated for salinity). The RBRconcerto³ calculates the concentration compensated for salinity first, then the air saturation (in %) via the following equation: where

• Cc is the concentration in uMol/L, compensated for salinity,
• Patm is atmospheric pressure, and
• Pav is air vapour pressure.

Solubility is calculated via Gordon and Garcia as: where S is the salinity in PSU and Ts is defined as: with T being the water temperature in °C and: Air vapour pressure (in dbar) is calculated as: The corresponding logger coefficients are:

• n0, the index of the concentration channel, already compensated for salinity
• n1, the index of the water temperature channel
• n2, the index of the salinity channel
• n3, the index of the atmospheric pressure channel (set to value in order to use settings atmosphere)