Hanna Instruments HI 9813-5 - Manual (Page 11)

11
Accessories needed:
• Use HI 70031 (1413
µ
S/cm = 1.413 mS/cm) EC calibration
solution or HI 70442 (1500 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 calibrated.
PROCEDURE
• Pour approximately 4 cm (1½") of a conductivity calibration
solution (e.g. HI 7031) 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 mS/cm (or ppm) key.
• Turn the EC/TDS calibration knob until the
display shows the EC or TDS reading at
25°C.
E C / T D S E C / T D S E C / T D S E C / T D S E C / T D S C A L I B R A T I O N C A L I B R A T I O N C A L I B R A T I O N C A L I B R A T I O N C A L I B R A T I O N