Nova-Tech SALT 6+ - Manual (Page 35)

Instruction Manual COND 6+, TDS 6+, SALT 6+
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11. CALCULATING TDS CONVERSION FACTOR
You can calibrate your meter using TDS calibration standard solutions. The calibration
standard only needs to give the TDS value at a standard temperature such as 25 °C.
To determine the conductivity-to-TDS conversion factor use the following formula:
Factor = Actual TDS ÷ Actual Conductivity @ 25 °C
Actual TDS: Value from the solution bottle label or as a standard you make
using high purity water and precisely weighed salts.
Tip: ppm = milligram of salt(s) per liter of water
Actual Conductivity : Value measured using a properly calibrated
Conductivity/Temperature meter.
Both the Actual TDS and the Actual Conductivity values must be in the same magnitude
of units. For example, if the TDS value is in ppm the conductivity value must be in
µS/cm; if the TDS value is in ppt the conductivity value must be in mS/cm.
Check your factor by multiplying the conductivity reading by the factor in the above
formula. The result should be in TDS value.
Tip: When the TDS factor is set to 1.0, Conductivity = TDS.