Due to the increasing amount of ARGO profiling floats in the ocean and to their moving nature, ARGO floats can not be recovered and their sensors can not be recalibrated at the end of their lifetime. The main problem concerns the conductivity sensor that may drift or show an offset due to biological fooling and other problems. A method has thus been developed by Wong et al. (2003) and Böhme and Send (2005) and implemented at the Coriolis Data Center in order to control the quality of the salinity data in an indirect way, to evaluate possible drift or offset of the conductivity sensors and to propose a correction. The aim of this delayed mode quality control is to provide a delayed-mode ARGO dataset with an accuracy of 0.01°C for temperature and 0.01 for salinity and for which conductivity sensor drifts and offsets have been taken into account and corrected whenever it is possible.