Hanna Instruments HI 9828 Instruction Manual

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Hanna Instruments HI 9828 Instruction Manual Manual pdf 32 page image

324.2.2 ProcedureDuring calibration the current measured value isshown on the primary display and the buffervalue on the secondary display.By pressing the BUFFER soft key it is possible to change the buffer value or inserta custom buffer.One to three-point calibration• Immerse the probe into the selected buffer and stir gently. On display thecurrent pH value, the buffer value and the message “Not ready” appear.• When the reading is stable and close to theselected buffer the display shows “Ready”.• Press CONFIRM to accept the value or BUFFERto select another buffer value with the arrow keys.• After the first calibration point is confirmed, immerse the probe in the secondbuffer solution and stir gently.• When the reading is stable and close to the selected buffer the display showsthe message “Ready”.• Press CONFIRM to accept the value or BUFFER to change the buffer value.• After the second calibration point is confirmed, proceed as above by immers-ing the probe in the third buffer solution, stirring gently and waiting for the mea-sure stability.• At the end of calibration on display the following messages appear: “Storingdata on probe, please wait...”, “Updating GLP data, please wait ...” and “Cali-bration completed”.• Press OK to close the last message and return to the calibration menu.• To return to the main menu, from the calibration menu, press ESC repeatedly.NOTE: the user can quit the pH calibration mode at any time, after 1 or 2confirmed buffers, by pressing the ESC key.Custom buffer calibrationHI 9828 allows a one point calibration with a custom buffer value, set by the