Hanna Instruments hi 9811 사용자 설명서
10
The TDS value in aqueous solutions is directly proportional to the
conductivity. The ratio between the two parameters depends on the
solution.
conductivity. The ratio between the two parameters depends on the
solution.
Both HI 9811 and HI 9811-5 models have a fixed conversion factor
set to 0.5. This means that 1 µS/cm is equal to 0.5 mg/L of TDS.
set to 0.5. This means that 1 µS/cm is equal to 0.5 mg/L of TDS.
EC/TDS CALIBRATION
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 cali-
brated.
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.
beaker to minimize any EMC interference.
• Immerse the probe in the solution.
• Wait for a couple of minutes for thermal equilibrium to be
• 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
• Turn the EC/TDS calibration knob until
the display shows the EC or TDS reading
at 25°C.
at 25°C.
EC/TDS CONVERSION FACTOR