10
The TDS value in aqueous solutions is directly proportional to the
conductivity. The ratio between the two parameters depends on the
solution.
Both HI 9812 and HI 9812-5 models have a fixed conversion factor
set to 0.5. This means that 1 µS/cm is equal to 0.5 ppm of TDS.
EC/TDS CALIBRATION
Accessories needed:
• Use HI 70031 (1413 µS/cm) EC calibration solution or HI
70032 (1382 ppm) TDS calibration solution.
Note: The conversion between EC and TDS is made by a built-in
circuit, hence it is requested to calibrate the meter only in EC
or TDS range. The other range is thus automatically cali-
brated.
PROCEDURE
• Pour approximately 4 cm (1½") of a conductivity calibration
solution (e.g. HI 70031) into a beaker. If possible, use plastic
beaker to minimize any EMC interference.
• Immerse the probe in the solution.
• Wait for a couple of minutes for thermal equilibrium to be
reached.
• Tap the probe on the bottom, then shake it lightly while rotating
to make sure no air bubbles remain trapped inside the probe.
• Press the "µS/cm" (or "ppm") key.
• Turn the EC/TDS calibration knob until
the display shows the EC or TDS reading
at 25°C.
EC/TDS CONVERSION FACTOR
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