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30
11.03
35
12.14
11.4 Temperature coefficients (alpha-values)
Substance at 25°C
HCl
KCl
CH
COOH
3
NaCl
H
SO
2
4
HF
α-coefficients of conductivity standards for a calculation to reference temperature 25 °C
Standard
84 µS/cm
1413 µS/cm
12.88 mS/cm
11.5 Practical salinity scale (UNESCO 1978)
The salinity is calculated according to the official definition of UNESCO 1978. Therefore the salinity Spsu of a
sample in psu (practical salinity unit) at standard atmospheric pressure is calculated as follows:
a
= 0.0080
0
a
= -0.1692
1
a
= 25.3851
2
a
= 14.0941
3
a
= -7.0261
4
a
= 2.7081
5
(32.4356 g KCl per 1000 g of solution)
SevenGo Duo pro™
92.19
548.5
100.92
602.5
Concentration
[%]
10
10
10
10
10
1.5
Measurement
Measurement
temp.: 15 °C
temp.: 20 °C
1.95
1.94
1.90
b
= 0.0005
0
b
= -0.0056
1
b
= -0.0066
2
b
= -0.0375
3
b
= 0.0636
4
b
= -0.0144
5
1552
1667
Temperature coefficient alpha
Measurement
temp.: 30 °C
1.95
1.95
1.94
1.94
1.89
1.91
k = 0.00162
14.12
15.39
[%/°C]
1.56
1.88
1.69
2.14
1.28
7.20
Measurement
temp.: 35 °C
2.01
1.99
1.95
Appendix 37
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