Oakton 35631-00 Operating Instructions Manual

Oakton 35631-00 Operating Instructions Manual Manual pdf 25 page image

494813. Appendix 2: Calculating TDS Conversion FactorsYou can calibrate your meter using TDS calibration standard solutions. The calibra-tion standard only needs to give the TDS value at a standard temperature such as25°C. To determine to the conductivity-to-TDS conversion factor use the followingformula:Factor = Actual TDS ÷ Actual Conductivity @ 25°CDefinitions:Actual TDS: Value from the solution bottle label or as a standard you make usinghigh purity water and precisely weighed salts.Actual Conductivity: Value measured using a properly calibrated Conductivity/Temperature meter.Both the Actual TDS and the Actual Conductivity values must be in the samemagnitude of units. For example, if the TDS value is in ppm the conductivity valuemust be in μS; if the TDS value is in ppt the conductivity value must be in mS.Check your factor by multiplying the conductivity reading by the factor in the aboveformula. The result should be the TDS value.12. Appendix 1: Conductivity to TDS Conversion Factors1. Factor—the conductivity to ppm TDS conversion factor. Multiply conductivity by this factor to get ppm TDS for the type of TDSreading needed.2. 442—a formulation that most closely represents the conductivity to ppm relationship, on average, for naturally occurring freshwater.3. TDS Your Material—These columns are for you to write in your application-specific conductivity-to-ppm values and conversionfactors for future reference.Factor = actual TDS ÷ Actual Conductivity @ 25°CConductivity TDS KCl TDS NaCl TDS 442 2 TDS Your Material 3at 25°C ppm Factor 1 ppm Factor 1 ppm Factor 1 ppm FactorValue Value Value Value84 μS 40.38 0.5048 38.04 0.4755 50.50 0.6563447 μS 225.6 0.5047 215.5 0.4822 300.0 0.67121413 μS 744.7 0.5270 702.1 0.4969 1000 0.70781500 μS 757.1 0.5047 737.1 0.4914 1050 0.70008974 μS 5101 0.5685 4487 0.5000 7608 0.847812880 μS 7447 0.5782 7230 0.5613 11,367 0.882515000 μS 8759 0.5839 8532 0.5688 13,455 0.897080 mS 52,168 0.6521 48,384 0.6048 79,688 0.9961

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