Hanna Instruments HI 98186 Instruction Manual

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Hanna Instruments HI 98186 Instruction Manual Manual pdf 32 page image

32GOOD LABORATORY PRACTICE (GLP)GOOD LABORATORY PRACTICE (GLP)GOOD LABORATORY PRACTICE (GLP)GOOD LABORATORY PRACTICE (GLP)GOOD LABORATORY PRACTICE (GLP)GLP is a set of functions that allows storage and retrieval of data regarding themaintenance and status of the electrode.All data regarding DO calibration is stored for the user to review whennecessary.EXPIRED CALIBRATIONThe instrument is provided with a real time clock (RTC), in order to monitor thetime 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 acalibration time out. The “CAL” “DUE” tags will start blinking to warn theuser that the instrument should be recalibrated.The calibration time out can be set (see SETUP for details, page 33) from 1 to7 days or can be disabled.For example, if a 4 days time out has been selected, the instrument will issuethe 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 thelast calibration.Notes: • When the instrument is not calibrated or the calibration is cleared(default values loaded) there is no “expired calibration”, and thedisplay always shows the “CAL” “DUE” tags blinking.• When an abnormal condition in the RTC is detected, the instrumentforces the “expired calibration” status.LAST DO CALIBRATION DATAThe last DO calibration data is stored automatically after a successful calibra-tion. To view the last calibration data, press GLP when the instrument is in theDO, BOD, OUR or SOUR measurement mode.The instrument will display a lot of data including calibration standard,salinity, pressure and temperature.Note: “Not user calibration” message is displayed if the calibration wascleared or the instrument hasn’t been calibrated for dissolved oxygen.