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MW180 pH / mV / EC / TDS / NaCl / Temperature Bench Meter
Salinity of a sample in practical salinity units (PSU) is calculated using the following formula:
where:
R
T
ratio of sample conductivity to standard conductivity at
Temperature (T)
C
T
(sample)
uncompensated conductivity at T °C
C(35, 15)=42.914 mS/cm
the corresponding conductivity of KCI solution containing a
mass of 32.4356 g KCl/1 Kg solution
r
T
temperature compensation polynomial
a
0
= 0.008
a
1
= -0.1692
a
2
= 25.3851
a
3
= 14.0941
a
4
= -7.0261
a
5
= 2.7081
b
0
= 0.0005
b
1
= -0.0056
b
2
= -0.0066
b
3
= -0.0375
b
4
= 0.0636
b
5
= -0.01442
c
0
= 0.008
c
1
= 0.0005
X = 400R
T
Y = 100R
T
%NaCl Percentage
In this scale 100% salinity is equivalent to roughly 10% solids.
If the reading is outside range, the full-scale value (400.0%) is displayed blinking.
High percentages were made by evaporation.
Natural Sea Water
The Natural Sea Water scale extends from 0.00 to 80.00 g/L. It determines salinity based
upon a conductivity ratio of sample to “standard seawater” at 15 °C.
