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GLP is a set of functions that allows storage and retrieval of data regarding the maintenance and
status of the electrode.
All data regarding DO calibration is stored for the user to review when necessary.
EXPIRED CALIBRATION
The calibration time out can be set (see SETUP for details, page 30) from 1 to 7 days or can be disabled.
The instrument is provided with a real time clock (RTC) in order to monitor the time elapsed since
the last DO calibration.
The real time clock is reset every time the instrument is calibrated and the “Expired Calibration”
status is triggered when the instrument detects a calibration time out. The “CAL DUE” tags will start
blinking to warn the user that the instrument should be recalibrated.
For example, if a 4 days time out has been selected, the instrument will issue the alarm exactly 4
days after the last calibration.
However, if at any moment the expiration value is changed (e.g. to 5 days), then the alarm will be
immediately recalculated and appear 5 days after the last calibration.
Notes: When the instrument is not calibrated or the calibration is cleared (default values loaded)
there is no “Expired Calibration”, and the display always shows the “CAL DUE” tags blinking.
When an abnormal condition in the RTC is detected, the instrument forces the “Expired
Calibration” status.
LAST DO CALIBRATION DATA
Data from the last DO calibration is stored automatically after a successful calibration. To view the last
calibration data, press GLP when the instrument is in the DO, BOD, OUR or SOUR measurement mode.
The instrument will display GLP data related to calibration including calibration standard, salinity,
pressure and temperature.
Note: “No user calibration” message is displayed if the calibration was cleared or the instrument
hasn’t been calibrated for dissolved oxygen.
GOOD LABORATORY PRACTICE (GLP)
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