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 μs/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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