Transmitter 9125 – Conductivity / resistivity measurement
Page 28
Concentration measure (TDS)
The Total Dissolved Solid (TDS) measure is a
concentration measure in the limits of measure where,
for a part given, the concentration of the solution is
proportional to its conductivity.
The next board show for the mains solutions, the
relations existing between concentration and
conductivity (in ppm).
The white part of the board show the limits where the
TDS display is possible.
The measure in concentration (TDS) is given by the
formula :
TDS = Cond x KTDS
The KTDS coefficient is calculated during the process
calibration of the device. It must be between 0.00 and
5.00. If it is not in this interval, an error message will
display during the calibration.
Limits of the TDS measure
For different substances, the limits of the measure
where the concentration is proportional to the
conductivity is given by the white part of the next
board:
The unit of the conductivity is
μ
s/cm.
Weight % ppm
NaCl
NaOH
NH4OH
NH3
HCl
H2SO4
HNO2
HF
SO2
Acid
Acetic
0,0001
1
2,2
6,2
4,1
6,6
11,7
8,8
6,8
10
6,4
4,2
0,0003
3
6,5
8,3
8,3
12
50
61
20
30
18
7,4
0,001
10
21,4
61,1
17
27
116
85,6
67
99
54
15
0,003
30
64
182
31
49
340
251
199
290
150
30,6
0,01
100
210
603
58
84
1140
805
657
630
450
63
0,03
300
617
1780
102
150
3390
2180
1950
1490
1200
114
0,1
1000
1990
5820
189
275
11100
6350
6380
2420
3600
209
0,3
3000
5690
16900
329
465
32200
15800
18900
5100
7900
368
1
10000
17600
53200
490
810
103000
48500
60000
11700
17200
640
3
30000
48600
144000
790
1110
283000
141000
172000
34700
32700
1120
5
50000
78300
223000
958
1115
432000
237000
275000
62000
42000
1230
10
100000
140000
358000
1115
1120
709000
427000
498000
118000
61000
1530
20
200000
225000
414000
968
4251
850000
709000
763000
232300
1600
30
300000
292000
725
732000
828000
861000
390000
1405
40
400000
191000
460
770000
820000
1080
50
500000
150000
620000
717000
740
75
750000
182000
340000
168
100
1000000
10000
50000
1
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