Hanna Instruments HI 98188 Instruction Manual

Hanna Instruments HI 98188 Instruction Manual Manual pdf 33 page image

33GLP is a set of functions that allows storage and retrieval of data regarding themaintenance and status of the electrode.All data regarding EC and NaCl calibration is stored for the user to reviewwhen necessary.EXPIRED CALIBRATIONThe instrument is provided with a real time clock (RTC), in order to monitor thetime elapsed since the last EC/NaCl 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 35) 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 calibration is cleared(default values loaded) there is no “expired calibration”, andthe display always shows the “CAL” “DUE” tags blinking.• When an abnormal condition in the RTC is detected, the instrumentforces the “expired calibration” status.LAST EC CALIBRATION DATAThe last pH calibration data is stored automatically after a successful calibration.To view the EC calibration data, press GLP when the instrument is in the ECmeasurement mode.GOOD LABORATORY PRACTICE (GLP)GOOD LABORATORY PRACTICE (GLP)GOOD LABORATORY PRACTICE (GLP)GOOD LABORATORY PRACTICE (GLP)GOOD LABORATORY PRACTICE (GLP)