Hanna Instruments HI 255 - Manual (Page 19)

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GOOD LABORATORY PRACTICE (GLP)
GLP is a set of functions that allows storage and retrieval of data regarding the
maintenance and status of the electrode.
All data regarding pH, Rel mV, EC and NaCl is stored for the user to review
when necessary.
CALIBRATION ALARM TIME-OUT
For pH calibration, this instrument allows the user to set the number of days
before the next required pH calibration. This value can be set from 1 to 7 days.
The default setting is OFF (disabled).
The instrument checks if the time-out time has expired. If the time elapsed, the
“CAL” “INTV” tags will blink as a reminder.
Note: If the instrument was not calibrated, the “CAL” “INTV” tags will be
displayed even if the feature is disabled in SETUP menu.
LAST pH CALIBRATION DATA
The last pH calibration data is stored automatically after a successful calibration.
To view the pH calibration data, press GLP when the instrument is in pH (mV)
measurement mode.
The instrument will display the time (hh:mm) of the last calibration.
Press the ARROW keys to view the next logged calibration parameter
(pressing the key):
_ The date (yy.mm.dd).
_ The pH calibration offset.
DATE CAL
mV CAL