Hanna Instruments HI 8733 - Manual (Page 6)

11 10
• Remove the battery compartment cover and adjust the calibration
trimmer located inside with the calibration screwdriver until the
display shows "12.88 mS" i.e. the conductivity reading @ 25°C.
• All subsequent measurements will be compensated to 25°C (77°F).
If you prefer to standardize the temperature compensation to
20°C (68°F) rather than 25°C (77°F), adjust the trimmer to read
"11.67 mS" (see the conductivity vs. temperature chart on page
18). All subsequent measurements will be compensated to 20°C.
• The calibration is now complete and the instrument is ready for
use.
The instrument should be recalibrated at least once a month, or
when the probe is changed.
Note: For more accurate results, it is advisable to use a calibration
solution close to the range to be measured. See the "Accesso-
ries" section for a wide selection of conductivity solutions.
• All subsequent measurements will be compensated to 25°C (77°F).
If you prefer to standardize the temperature compensation to
20°C (68°F) rather than 25°C (77°F), leave the TEMPERATURE
knob at 18°C (if the temperature of the solution is 18°C), adjust
the trimmer to read "11.67 mS" (see the conductivity vs. tem-
perature chart) or "1251 mg/L" (see the TDS vs. temperature
chart). All subsequent measurements will be compensated to
20°C.
• The calibration is now complete and the instrument is ready for
use.
The instrument should be recalibrated at least once a month, or
when the probe is changed.
Note: For more accurate results, it is advisable to use a calibration
solution close to the measurement range. See the "Accessories"
section for a wide selection of conductivity solutions.
PROCEDURE FOR HI 8733
• Pour sufficient quantity of a conductivity
calibration solution (e.g. HI 7030/
HI 8030) into a beaker to cover the holes
on the probe. If possible, use plastic
beakers to minimize any EMC interfer-
ence.
• Immerse the conductivity probe in the
solution, making sure that holes are com-
pletely submerged.
• Wait for a couple of minutes for thermal
equilibrium to be reached.
• Tap the probe on the bottom, then shake it while rotating to
make sure no air bubbles remain trapped in the sleeve.
• Switch the instrument on by pressing
ON/OFF.
• Set the temperature coefficient knob to
2% to compensate for the temperature
effect of average solutions (to determine
exact value for a particular solution, see
page 14).
• Select 19.99 mS/cm range by pressing
the appropriate range key.
HI 7030
ON
OFF
2.5
2
1.5 1
0.5
0
TEMPERATURE COEFFICIENT
19.99
mS