Hanna-instruments HI 9811 Instrukcja Użytkownika Pobierz pdf (Strona 11)

The TDS value in aqueous solutions is directly proportional to the

conductivity. The ratio between the two parameters depends on the

solution.

HI 9811-5 model has a fixed conversion factor set to 0.5. This

means that 1 µS/cm is equal to 0.5 mg/L of TDS.

Accessories needed:

• Use HI 70031 (1413 µS/cm) EC calibration solution or

HI 70032 (1382 ppm, or mg/L) 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

calibrated.

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 mg/L) key.

• Turn the EC/TDS calibration knob until

the display shows the EC or TDS reading

at 25°C.

EC/TDSEC/TDS

EC/TDS

CALIBRATION CALIBRATION

CALIBRATION

EC/TDS CONVERSION FACTOREC/TDS CONVERSION FACTOR

EC/TDS CONVERSION FACTOR

1 2 ... 6 7 8 9 10 11 12 13 14 15 16

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Hanna-instruments HI 9811 Instrukcja Użytkownika Strona 11