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Appendix
13.1.4 Buffer group 4 (ref. 25 °C) JIS Z 8802 (Japanese)
5
10
15
20
25
30
35
40
45
50
13.2 Conductivity standards
The following predefined standards are available:
●
84 μS/cm
●
1413 μS/cm (default standard)
●
12.88 mS/cm
Tables for automatic temperature compensation are programmed in the meter for each standard.
T (°C)
0
10
15
20
25
30
35
13.3 Conductivity to TDS conversion factors
Conductivity
at 25 °C
84 µS
447 µS
1413 µS
1500 µS
8974 µS
12.880 µS
15.000 µS
80 mS
13.4 Examples of temperature coefficients (alpha-values)
Substance at 25°C
HCl
KCl
26
1.668
1.670
1.672
1.675
1.679
1.683
1.688
1.694
1.700
1.704
84 μS/cm
46 µS/cm
60 µS/cm
68 µS/cm
76 µS/cm
84 µS/cm
93 µS/cm
102 µS/cm
TDS KCl
ppm value
40.38
225.6
744.7
757.1
5101
7447
8759
52.168
Concentration
[%]
10
10
3.999
6.951
3.9998
6.923
3.999
6.900
4.002
6.881
4.008
6.865
4.015
6.853
4.024
6.844
4.035
6.838
4.047
6.834
4.060
6.833
1413 μS/cm
776 µS/cm
1020 µS/cm
1147 µS/cm
1278 µS/cm
1413 µS/cm
1552 µS/cm
1696 µS/cm
factor
0.5048
0.5047
0.527
0.5047
0.5685
0.5782
0.5839
0.6521
Temperature coefficient alpha
[%/°C]
1.56
1.88
9.395
9.332
9.276
9.225
9.180
9.139
9.102
9.068
9.038
9.011
12.88 mS/cm
7.15 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
TDS NaCl
ppm value
factor
38.04
0.4755
215.5
0.4822
702.1
0.4969
737.1
0.4914
4487
0.5000
7230
0.5613
8532
0.5688
48.384
0.6048
pH/conductivity meter SG23
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