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Info Centre >> Water Treatment Technical Manual >> 2.Conductivity/Total Dissolved Solids >> 2.2 Conductivity To TDS Conversion Factors
1. Factor
The conductivity to ppm TDS conversion factor. Multiply conductivity by this factor to get ppm TDS for the type of TDS reading needed.
2. 442
A formulation that most closely represents the conductivity to ppm relationship, on average, for naturally occurring fresh water.
Factor = Actual TDS / Actual Conductivity @ 25°C.
*Information Provided Courtesy of Eutech Instruments Pte Ltd Copyright © 1997
| Conductivity To TDS Conversion Factors | |||||||||||||||||||
Conductivity at 25°C |
TDS KCl |
d |
TDS NaCl |
c |
TDS 442 |
j |
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ppm Value |
Factor |
ppm Value |
Factor |
ppm Value |
Factor |
||||||||||||||
| 84 µS | 40.38 | 0.5048 | 38.04 | 0.4755 | 50.50 | 0.6563 | |||||||||||||
| 447 µS | 225.6 | 0.5047 | 215.5 | 0.4822 | 300.0 | 0.6712 | |||||||||||||
| 1413 µS | 744.7 | 0.5270 | 702.1 | 0.4969 | 1000 | 0.7078 | |||||||||||||
| 1500 µS | 757.1 | 0.5047 | 737.1 | 0.4914 | 1050 | 0.7000 | |||||||||||||
| 8974 µS | 5101 | 0.5685 | 4487 | 0.5000 | 7608 | 0.8478 | |||||||||||||
| 12,880 µS | 7447 | 0.5782 | 7230 | 0.5613 | 11,367 | 0.8825 | |||||||||||||
| 15,000 µS | 8759 | 0.5839 | 8532 | 0.5688 | 13,455 | 0.8970 | |||||||||||||
| 80 mS | 52,168 | 0.6521 | 48,384 | 0.6048 | 79,688 | 0.9961 | |||||||||||||