Hanna Instruments HI 84500 User Manual
Page 25
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Note: DO NOT PLACE THE TIP INTO THE SAMPLE BEAKER.
PLACE THE TIP OVER A WASTE BEAKER. A SMALL
AMOUNT OF TITRANT IS DISPENSED WHEN THE PUMP
RESETS.
• Press
Start to begin a titration.
• Wait for the syringe to refill.
• Place the stir bar in the beaker and put the beaker into the
beaker holder.
• Place the probe holder on the top of the beaker and secure it by
turning clockwise.
• Rinse the ORP electrode with deionized water and immerse into
the sample until the PTFE reference junction is completely
submerged. Be sure that the tip of the electrode is not hitting
the stir bar.
• Insert the dosing tip into the titrant tube sleeve. IT IS CRITICAL
THAT THE TIP BE IMMERSED APPROXIMATELY 0.25 CM (0.1”)
INTO THE SOLUTION BEING TITRATED.
• Press
Continue to begin the titration and Stop to abort it.
• At the end of the titration the instrument displays the concentration in ppm of SO
2
. The titration
curve can be viewed by pressing
Plot ON. Press Plot OFF to exit this mode. For more information
about this feature, see page 22.
• Press
LOG to record the concentration value and the titration curve into the instrument’s
memory. A message will be displayed for a few seconds indicating the amount of free log
space. Up to 200 log samples can be recorded in the instrument’s memory.
• Press
Restart to begin a new titration or ESC to return to the titration menu.