Hanna Instruments HI 121 - Manual (Page 25)

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GLP is a set of functions that allows storage and retrival of data regarding
the maintenance and status of the electrode.
All data regarding pH, Rel mV and ISE calibration is stored for the user
to review when necessary.
CALIBRATION ALARM TIME OUT
For pH calibration, all the instruments allow 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 has expired. If the time elapsed,
“CAL DUE” tags will blink as a reminder.
Note: If the instrument was not calibrated or all calibration parameters
were cleared, “CAL” “DUE” 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 2nd then GLP key or simply GLP from the
left keyboard (HI 121) when the instrument is in pH (mV) measurement mode.
The instrument will display the date (yyyy.mm.dd) of the last calibration.
Press the ARROW keys to view the next calibration parameter (pressing
the key):
• The time (hh:mm) of the last calibration.
GOOD LABORATORY PRACTICE (GLP)