Hanna Instruments HI 98188 Instruction Manual page 12

According to the definition, salinity of a sample in psu (practical salinity units)
is calculated using the following formula:
R - coefficient;
T
C (sample) - uncompensated conductivity at T °C;
T
C(35,15)= 42.914 mS/cm - the corresponding conductivity of KCl solution
containing a mass of 32.4356 g KCl / 1 Kg solution;
r - temperature compensation polynom
T
a = 0.008 b =0.0005
0 0
a = -0.1692 b = -0.0056
1 1
a = 25.3851 b = -0.0066
2 2
a = 14.0941 b = -0.0375
3 3
a = -7.0261 b = 0.0636
4 4
a = 2.7081 b = -0.0144
5 5
c = 0.008
0
c = 0.0005
1
X = 400R
T
Y = 100R
T
f (T)= (T-15)/[1+0.0162(T-15)]
Note:
• The formula can be applied for salinity values between
0 and 42 psu.
• The formula can be applied for temperatures between
-2 °C and 35 °C.
To reach this range press Mode while in Salinity range until the practical
salinity scale [PSU] is displayed.
12