Conductivity Standards; Practical Salinity Scale (Unesco 1978); Conductivity To Tds Conversion Factors - Mettler Toledo SevenEasy S30 Instrucciones De Manejo

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14.2

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
14.3

Practical salinity scale (UNESCO 1978)

In the 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 pressure
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)
14.4

Conductivity to TDS conversion factors

Conductivity
at 25 °C
ppm value
84 µS
40.38
447 µS
225.6
1413 µS
744.7
1500 µS
757.1
8974 µS
5101
12.880 µS
7447
15.000 µS
8759
80 mS
52.168
METTLER TOLEDO SevenEasy™ 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
= 0.0005
k = 0.00162
= -0.0056
= -0.0066
= -0.0375
= 0.0636
= -0.0144
TDS KCl
Factor
ppm value
0.5048
38.04
0.5047
215.5
0.527
702.1
0.5047
737.1
0.5685
4487
0.5782
7230
0.5839
8532
0.6521
48.384
TDS NaCl
Factor
0.4755
0.4822
0.4969
0.4914
0.5000
0.5613
0.5688
0.6048
Appendix
19

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