EUTECH INSTRUMENTS 2700 Manuel d'instructions télécharger pdf (Page 47)

21. Calculating TDS Conversion Factor

You can calibrate TDS using the value of the calibration standard solution at a

standard temperature such as 25 ºC. To determine the conductivity-to-TDS

conversion factor use the following formula:

Factor = Actual TD

S ÷ Actual Conductivity @ 25 ºC

• Act

ual TDS: Value from the solution bottle label or as a standard

made using high purity water and precisely weighed salts.

ppm = milligram of salt(s) per liter of water = mg/L

ppt = gram of salt(s) per liter of water = g/L

• 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

magnitud

e of units. For example, if the TDS value is in ppm the conductivity value

must be in µS; if the TDS value is in ppt the conductivity value must be in mS.

Check your factor by multiplying the condu

ctivity reading by the factor in the

above formula. The result should be in TDS value.

When the TDS factor is set to 1.0, Conductivity = TDS.

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EUTECH INSTRUMENTS 2700 Manuel d'instructions Page 47