User Guide

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The instrument should be re-calibrated at least once a month, or
when the probe or battery is changed.
Note: For more accurate results, it is advisable to use a calibration
solution close to the range to be measured. See the accessories
section on page 23 for a wide selection of conductivity solu-
tions.
PROCEDURE FOR HI 8734
• Pour sufficient quantity of a TDS calibra-
tion solution (e.g. HI 7032) into a beaker
to cover the holes on the probe. If pos-
sible, use plastic beakers to minimize any
EMC interference.
• Immerse the TDS probe, making sure
that holes are completely submerged, and
the ChecktempC in the solution.
• 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.
• Record the temperature of the HI 7032 buffer solution from the
ChecktempC (e.g. 18°C).
• Switch the instrument on by pressing
ON/OFF.
• Press TDS/TEMP to display the temperature.
• Adjust the TEMPERATURE knob to display 18°C.
• Press TDS/TEMP again to display the TDS
measurement.
• Select 1999 mg/L range by pressing the ap-
propriate range key.
H
I 7
0
3
0
°C
ON
OFF
TDS
TEMP.
TDS
TEMP.
TEMPERATURE
1999
mg/l
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• Adjust the calibration trimmer (see page 7,#6) on the side of the
instrument with the calibration screwdriver until the display shows
the TDS reading at 25°C (see the TDS vs. temperature chart on
page 19). E.g. @25°C "1382 mg/L".
• 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 to 18°C (if the temperature of the solution is 18°C). Adjust
the trimmer to read "1251 mg/L" (see the TDS vs. temperature
chart on page 19). All subsequent measurements will be compen-
sated to 20°C.
• The calibration is now complete and the instrument is ready for
use.
The instrument should be re-calibrated once a month, or when the
probe or battery is changed.
Note: For more accurate results, it is advisable to use a calibration
solution close to the range to be measured. See the accessories
section on page 23 for a wide selection of TDS solutions.
PROCEDURE FOR HI 933000
• 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 bea-
kers to minimize any EMC interference.
• 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.
T
E
M
P
E
R
A
T
U
R
E
HI 7030