User Guide

15
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