Please explain the relationship between these params

Yes you fixed it :D The Sigma is only for doing SG at auto correct and non-autocorrect.

Ok now

25.3 sigma-15.
It is pretending to correct to a SG meter that is = to a calibrated point at that temp of 18.90C or 25.00C or what ever the sample temp is. Where you want it

Sigma-t
24.3 sigma-t and 22.8 sigma-t. It is in a non temp correct mode for SG. It is telling your or pretending the calibration temp point is 15 C and is not adjusting for 18.90C or 25.00C . You do not want it in this mode


It is currently set to 1.90%/C (at the factory

Yes leave it. This is in some meters to correct that pre-programmed cure I talked about.

Should I change it seeing that my temperature compensated conductivity value is not 52mS/cm when not on 25C?

No it is fixed. Leave it as is. All your readings now are correct, like perfect. No more playing. Put back in box :D

@ 25.00C in sigma-15 mode
==================
52.01mS/cm (Temp Comp. Cond.)
52.02mS/cm (Actual Cond.)
34.22 Salinity
25.4 sigma-15


We are fixed I think you did good :thumbsup:
 
Well in the process I think I understand salinity, SG, density and conductivity a bit better. And I have a working value from my (ouch) $2000 meter. Thanks!!!
 
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