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Substance at 25°C
CH
COOH
3
NaCl
H
SO
2
4
HF
-coefficients of conductivity standards for a calculation to reference temperature 25 °C
Standard
84 µS/cm
1413 µS/cm
12.88 mS/cm
13.5 Practical salinity scale (UNESCO 1978)
In the SevenGo™ conductivity meters, 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
atmospher ic 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)
13.6 Temperature correction factors
Temperature correction factors f
°C
0
1
2
3
4
5
6
7
8
9
10
11
12
pH/conductivity meter SG23
Concentration
[%]
10
10
10
1.5
Measurement
temp.: 15 °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
for non-linear conductivity correction
25
.0
.1
.2
.3
1.918
1.912
1.906
1.899
1.857
1.851
1.845
1.840
1.800
1.794
1.788
1.783
1.745
1.740
1.734
1.729
1.693
1.688
1.683
1.678
1.643
1.638
1.634
1.629
1.596
1.591
1.587
1.582
1.551
1.547
1.542
1.538
1.508
1.504
1.500
1.496
1.467
1.463
1.459
1.455
1.428
1.424
1.420
1.416
1.390
1.387
1.383
1.379
1.354
1.351
1.347
1.344
Temperature coefficient alpha
[%/°C]
1.69
2.14
1.28
7.20
Measurement
Measurement
temp.: 20 °C
temp.: 30 °C
1.95
1.95
1.94
1.94
1.89
1.91
k = 0.00162
.4
.5
.6
1.893
1.887
1.881
1.834
1.829
1.822
1.777
1.772
1.766
1.724
1.719
1.713
1.673
1.668
1.663
1.624
1.619
1.615
1.578
1.573
1.569
1.534
1.529
1.525
1.491
1.487
1.483
1.451
1.447
1.443
1.413
1.409
1.405
1.376
1.372
1.369
1.341
1.337
1.334
Appendix
Measurement
temp.: 35 °C
2.01
1.99
1.95
.7
.8
.9
1.875
1.869
1.863
1.817
1.811
1.805
1.761
1.756
1.750
1.708
1.703
1.698
1.658
1.653
1.648
1.610
1.605
1.601
1.564
1.560
1.555
1.521
1.516
1.512
1.479
1.475
1.471
1.439
1.436
1.432
1.401
1.398
1.384
1.365
1.362
1.358
1.330
1.327
1.323
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