Hanna Instruments HI 84500 - Manual (Page 20)

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• Press Start, wait for the syringe to refill.
• Place the stir bar in the beaker and put the beaker in the
minititrator top.
• 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. If necessary additional distilled or
deionized water can be added.
• 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 calibration and Stop to abort it.
• At the end of the calibration, “ Calibration Completed“
appears on display. To repeat the calibration press Restart
and ESC to return to the main screen.
Note:
• If an erroneous situation is encountered during
the calibration, an error message is displayed
and the calibration can be restarted by pressing
Restart. Prepare a new standard, rinse electrode
and dosing tip and try again.
• If the calibration doesn’t complete and the
max titrant volume of titrant is reached, an
error message will be displayed. The calibration
can be restarted by pressing
Restart. Prepare
a new standard, rinse the electrode and dosing
tip and try again.
• This error message appears when the input
reading (mV) exceeds the input limits
(± 2000.0 mV).