Hanna Instruments HI 9828 Instruction Manual

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Hanna Instruments HI 9828 Instruction Manual Manual pdf 31 page image

31• Screw back the calibration beaker clockwise on the probe body.• Wait for reading stability and then press CONFIRM.• After CONFIRM is pressed the messages “Storing data on probe, please wait...”and “Updating GLP data, please wait ...” appear.• Then the 3 calibration items screen appearsagain and the checked box will be full or emptyin accordance with the calibrated parameters.• Press OK to go back to the calibration menu.NOTE: To abort the quick calibration press ESC at any time.4.2 pH CALIBRATIONCalibrate the meter often, especially if high accuracy is required.Selecting pH calibration, the display shows two possibilities: “Calibrate pH” and“Clear old calibration”.By selecting “Calibrate pH” and pressing OK, itis possible to start a new calibration at 1, 2 or 3points with standard buffers (pH 4.01, 6.86 or7.01, 9.18 or 10.01) or a 1 point calibrationwith a custom buffer.By selecting “Clear old calibration” and pressing OK, it is possible to delete thecalibration data and restore the default data.NOTES: It is important to delete old calibration data every time the pH electrodeis replaced and after a cleaning procedure.When a 3-point calibration is performed all the old data are overwrit-ten. If a 1 or 2-point calibration is performed, for the missing values themeter will use the old data, stored in previous 3-point calibration.4.2.1 PreparationPour small quantities of the buffer solutions into clean beakers. If possible, useplastic beaker to minimize any EMC interferences. For accurate calibration andto minimize cross contamination, use two beakers for each buffer solution. Onefor rinsing the electrode and the second for calibration.