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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 oC. 

Conductivity 
at 25 oC
TDS KCl TDS NaCl TDS 442
ppm Value Factor ppm Value Factor ppm Value Factor
84 S 40.38 0.5048 38.04 0.4755 50.50 0.6563
447 S 225.6 0.5047 215.5 0.4822 300.0 0.6712
1413 S 744.7 0.5270 702.1 0.4969 1000 0.7078
1500 S 757.1 0.5047 737.1 0.4914 1050 0.7000
8974 S 5101 0.5685 4487 0.5000 7608 0.8478
12,880 S 7447 0.5782 7230 0.5613 11,367 0.8825
15,000 S 8759 0.5839 8532 0.5688 13,455 0.8970
80 mS 52,168 0.6521 48,384 0.6048 79,688 0.9961

 

Copyright 1997 Eutech Instruments Pte Ltd. marketing@eutechinst.com