Hanna Instruments HI 8819 - Manual (Page 8)

8
CALIBRATION CALIBRATION CALIBRATION CALIBRATION CALIBRATION
INITIAL PREPARATION
If you are measuring in the mS ranges, calibrate the meter using
HI7030 (or HI8030) conductivity solution (12.88 mS @ 25°C) or
HI7034 (or HI8034) conductivity solution (80 mS @ 25°C). Choose
a solution with a conductivity value close to the solution to be
measured. For the µS ranges, use HI7031 (or HI8031) conductivity
solution (1413 µS @25°C) when calibrating in the range from 0 to
1999 µS or HI7033 (or HI8033) conductivity solution (84 µS @
25°C) when calibrating in the range from 0 to 199.9 µS.
Rinse the probe thoroughly in distilled water. This is to minimize
contamination of the calibration solution and secure higher accuracy.
When possible, use plastic beakers to minimize any EMC interfer-
ences.
PROCEDURE FOR HI8819:
• Pour a small quantity of the conductivity so-
lution into a plastic beaker e.g. HI7030 or
HI8030 (12.88 mS/cm @ 25°C).
• Immerse the conductivity probe in the solu-
tion submerging the holes of the sleeve (0.5cm
below). Make sure that no air bubbles are
trapped inside the glass sleeve. Wait for 2 or
3 minutes for the thermal equilibrium.
• Use a CHECKTEMP or a glass thermometer
with resolution of 1° for measuring the
temperature of the solution (e.g. 18°C).
• Switch the instrument on by pressing the ON/
OFF key.
• Press COND/TEMP key to display temperature
settings.
• Adjust the TEMPERATURE knob to display
"25°C" if you are using 25°C (77°F) as refer-
ence temperature.
HI 7030
°C
TEMPERATURE