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Consider an RBRconcerto 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 RBRconcerto calculates the concentration compensated for salinity and pressure first:

where

O2corr is the corrected O2 concentration, compensated for salinity and pressure.
O2unc is the uncompensated O2 concentration returned by the RBRoptode.
C0 and C1 are corrections and scaling factors for the uncompensated O2 concentration.
C2 is a correction factor for pressure.
S is the salinity in PSU

and

where T is the water temperature (in °C), and

which correspond to Garcia and Gordon coefficients.

The corresponding logger coefficients are:

c0 is C0
c1 is C1
c2 is C2
n0 is the index of the water temperature channel
n1 is the index of the salinity channel
n2 is the index of the pressure channel
n3 is the index of atm. pressure channel (set to value in order to use settings atmosphere)

One might change c0 and c1 in order to perform a two point calibration to the RBRoptode. Please note that those coefficients are used and stored only by the logger, not the RBRoptode.

Example commands:

>> calibration 4 type
<< calibration 4 type = doxy23

( Confirm the channel type )

>> calibration 4

<< calibration 4 type = doxy23, datetime = 20160401120005, c0 = 0,c1 = 1, c2 = 3.25e-5, n0 = 5, n1 = 8, n2 = 3, n3 = value

( Request confirmation of everything )