palintest Micro 600 COND Manual

palintest Micro 600 COND Manual Manual pdf 29 page image

11Calculating TDS Conversion Factor29You can calibrate your meter using TDS calibration standard solutions.The calibration standard only needs to give the TDS value at a standardtemperature such as 25°C. To determine the conductivity-to-TDS conversionfactor use the following formula:Factor = Actual TDS ÷ Actual Conductivity @ 25°CActual TDS: Value from the solution bottle label or as a standardyou make using high purity water and precisely weighed salts.Tip: ppm = milligram of salt(s) per litre of waterActual Conductivity: Value measured using a properly calibratedConductivity/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 conductivityvalue must be in μS/cm; if the TDS value is in ppt the conductivity value mustbe in mS/cm.Check your factor by multiplying the conductivity reading by the factorin the above formula. The result should be in TDS value.Tip: When the TDS factor is set to 1.0, Conductivity = TDS.