Ec/Tds Calibration - Hanna Instruments HI 9812 Instruction Manual

Portable ph/ec/tds meters

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EC/TDS

EC/TDS CALIBRATION

CALIBRATION

EC/TDS

CALIBRATION

Accessories needed:

• Use HI 7031 or HI 8031, 1,413 µS/cm (=1.413 mS/cm) EC

solution for HI 9812 and HI 9813 or HI 7032, 1382 ppm

TDS solution for HI 9812 or HI 70442, 1500 ppm TDS

solutions for HI 9813.

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 con-

ductivity calibration solution (e.g. HI

7031/HI 8031) into a beaker. If pos-

sible, use plastic beakers to minimize any

EMC interference.

• Immerse the combined electrode in the solution.

• Wait for a couple of minutes for thermal equilib-

rium to be reached.

• Tap the combined electrode on the bottom, then

shake it lightly while rotating to make sure no air

bubbles remain trapped inside the probe.

• Select the appropriate range, e.g. µS/cm for HI 9812 or the mS/

cm key for the HI9813.

• Turn the EC/TDS calibration knob until the

display shows the EC or TDS reading at

25°C.

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Hi 9813