Hanna Instruments HI 84432 - Manual (Page 31)

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• If the concentration is out of limits an exceeded range limit message will be displayed
blinking and the message “Out of range” will be shown. Another titration can be initiated
by pressing Restart. Prepare a fresh sample and then press Restart.
Note: If the end-point is not reached or it is not recognized or the input reading is out of range,
an error message will be displayed. Also the sign “<” underrange or “>” overrange is
shown. The titration can be restarted after a new sample is prepared by pressing Restart.
TIPS FOR AN ACCURATE MEASUREMENT
• Calibrate the instrument in 8.20 pH buffer solution at least once a day, before you start to
perform measurements.
• Purge the peristaltic pump to have the fresh titrant when starting a new calibration.
• Calibrate the peristaltic pump daily before performing a set of analyses.
• Clean the electrode in order to remove possible coatings from bulb.
• Precision of the measurement can be improved by using volumetric pipettes for standard and
sample additions.
• Pump calibration can be checked by running 2 mL pump standard as an unknown. It should
read 3.2% CA on HR, and 0.42% CA on LR setting.
VIEW/DELETE TITRATOR RECORDED LOG DATA
Press MENU key while in Titrator main screen.
Press Recall to access the titrator recorded data.
The instrument will display a list of all the titration records stored in the titration log.