Salinity

Salinity is defined as the ratio of the mass of dissolved material to the mass of seawater. It is impossible to measure absolute salinity directly. However, we can derive practical salinity from measurable properties: electrical conductivity, temperature, and pressure, obtained by your RBR CTD instrument, such as the RBRconcerto³ C.T.D or RBRbrevio³ C.T.D. The units of measurement are PSU (dimensionless Practical Salinity Units).

RBR uses the algorithm recommended by PSS78, the world standard for practical salinity calculation. It enables calculation of practical salinity in a range 2 to 42PSU from conductivity S (mS/cm) measured at temperature T (°C) and hydrostatic pressure p (dBar). Refer to Practical Salinity Scale of 1978 (PSS78) for more details.

The RBRduo³ C.T will calculate salinity if you enter depth in the table under the Parameters tab in Ruskin. See Ruskin User Guide: Standard Instruments³.