Hanna Instruments HI 254 - Manual (Page 12)

12
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 the last calibration (one, two, three, four or five-point) is
stored for the user to review when necessary. This data includes the following:
calibration time stamp, offset (mV), average of slope (%), calibration buffers
and the time until a new calibration is required.
CALIBRATION ALARM TIME-OUT
HI 254 allows the user to set the number of days before the next required
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 CALIBRATION DATA
Last calibration data is stored automatically after a successful calibration.
To view the pH calibration data, press GLP while in 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 ºC key):
• The date (yyyy.mm.dd).
• The pH calibration offset.
• The pH calibration slope (the GLP slope is the average of the calibration
slopes; the percentage is referred to the ideal value of 59.16 mV/pH).
TIME CAL
DATE CAL
CAL mV
% CAL