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7
APPENDIX
7.1
Conductivity standards
T(°C)
5
10
15
20
25
30
35
Examples of temperature coefficients (α-value)
7.2
Substance at 25 ° C
HCl
KCl
CH3COOH
NaCl
H2SO4
HF
α-coefficients of conductivity standards for a calculation to reference temperature of 25°C
Standard
84 μS/cm
1413 μS/cm
12.88 mS/cm
7.3
Conductivity to TDS conversion factors
Conductivity
At 25 °C
84 μS
447 μS
1413 μS
1500 μS
8974 μS
12.88 μS
15 μS
80 mS
STARTER 300C Portable Conductivity Meter
10 μS/cm
6.1 µS/cm
7.0 µS/cm
8.0 µS/cm
9.0 µS/cm
10.0 µS/cm
11.0 µS/cm
12.1 µS/cm
Concentration [%]
10
10
10
10
10
1.5
Measurement
temp.: 15° C
1.95
1.94
1.90
TDS KCl
ppm value
40.38
225.6
744.7
757.1
5101
7447
8759
52.168
84 μS/cm
1413 μS/cm
53 µS/cm
60 µS/cm
1020 µS/cm
68 µS/cm
1147 µS/cm
76 µS/cm
1278 µS/cm
84 µS/cm
1413 µS/cm
92 µS/cm
1552 µS/cm
101 µS/cm
1667 µS/cm
Temperature coefficient α [%/° C]
1.56
1.88
1.69
2.14
1.28
7.20
Measurement
temp.: 20° C
1.95
1.94
1.89
Factor
0.5048
0.5047
0.527
0.5047
0.5685
0.5782
0.5839
0.6521
12.88 mS/cm
896 µS/cm
8.22 mS/cm
9.33 mS/cm
10.48 mS/cm
11.67 mS/cm
12.88 mS/cm
14.12 mS/cm
15.39 mS/cm
Measurement
temp.: 30° C
1.95
1.94
1.91
TDS NaCl
ppm value
38.04
215.5
702.1
737.1
4487
7230
8532
48.384
Measurement
temp.: 35° C
2.01
1.99
1.95
Factor
0.4755
0.4822
0.4969
0.4914
0.5000
0.5613
0.5688
0.6048
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