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9.3. MEASUREMENT
MW306 supports three seawater salinity scales:
y Practical Salinity Units (PSU)
y Natural Seawater (g/L)
y Percentage (%NaCl)
Press RANGE/ to select salinity scales. Verify that the required
scale is configured in SETUP.
Note: These units are for determining salinity and they refer to
general use of saltwater. Practical salinity and natural seawater
require a conductivity calibration. %NaCl requires calibration
in MA9066 standard.
PSU – Practical Salinity Units
The practical salinity (S) of seawater relates the ratio of electrical
conductivity of a standard seawater sample at 15 °C and
1 atmosphere to a potassium chloride solution (KCl) with a mass
of 32.4356 g/Kg water at the same temperature and pressure.
The ratio is equal to 1, and S = 35. The practical salinity scale
may be applied to values to through 42.00 PSU at temperatures
between -2 to 35 °C.
Salinity of a sample in practical salinity units (PSU) is calculated
using the following formula:
SALINITY 31
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