Conductivity Standards; Examples Of Temperature Coefficients (Α-Values); Practical Salinity Scale (Unesco 1978) - Mettler Toledo SevenGo SG3 Instrucciones De Manejo

8.2

Conductivity standards

t(°C) 84 µS/cm
0 46 µS/cm
10 60 µS/cm
15 68 µS/cm
20 76 µS/cm
25 84 µS/cm
30 93 µS/cm
35 102 µS/cm
8.3 Examples of temperature coefficients (α-values)
Substance at 25°C
HCl
KCl
CH COOH
3
NaCl
H SO
2 4
HF
8.4

Practical salinity scale (UNESCO 1978)

In the SG3 and SG7 conductivity meter 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 pres-
sure is calculated as follows:
a = 0.0080 b
0 0
a = -0.1692 b
1 1
a = 25.3851 b
2 2
a = 14.0941 b
3 3
a = -7.0261 b
4 4
a = 2.7081 b
5 5
(32.4356 g KCl per 1000 g of solution)
METTLER TOLEDO SevenGo™ conductivity
1413 µS/cm 12.88 mS/cm
776 µS/cm 7.15 mS/cm
1020 µS/cm 9.33 mS/cm
1147 µS/cm 10.48 mS/cm
1278 µS/cm 11.67 mS/cm
1413 µS/cm 12.88 mS/cm
1552 µS/cm 14.12 mS/cm
1696 µS/cm 15.39 mS/cm
Concentration [%]
10
10
10
10
10
1.5
= 0.0005 k = 0.00162
= -0.0056
= -0.0066
= -0.0375
= 0.0636
= -0.0144
Temperature coefficient
1.56
1.88
1.69
2.14
1.28
7.20
Appendix
[%/°C]
α
17