26
ELECT
rODE
C
ALIB
rA
TION
Pr
OCEDU
rE
• Press
Confirm
to confirm the calibration.
• The calibrated value will be shown on the display and the third expected buffer value will be
automatically selected.
• After the second calibration point has been confirmed, press
ESC
to exit without performing the
third calibration point.
Three-Point Calibration
• Remove the electrode holder with electrodes from the top of the beaker.
• Place the third beaker with calibration buffer in the beaker holder. Rinse the electrodes in a beaker
containing the third buffer rinsing solution.
• Place the electrode holder (with electrodes) on the top of the beaker and secure it by turning
clockwise and press
STIR
.
• The (unstable measurement) symbol will be shown on the display until the reading becomes
stable.
• When the reading is stable and close to the selected buffer, the (unstable measurement) symbol
will disappear and the
Confirm
key will become active.
• Press
Confirm
to confirm the calibration. The instrument stores the calibration value and returns to
calibration menu, where the date and time for the pH calibration will be updated.
Note:
A buffer confirmed during the calibration process is removed from the list of available
buffers.
Error Messages During Calibration
• If the value measured by the instrument is not close to the selected buffer a “Wrong Buffer” error
message will be shown on the display.
Check if the correct buffer has been used or regenerate the pH electrodes by following the Cleaning
Procedure (see ELECTRODE CONDITIONING & MAINTENANCE section). If necessary change the
buffer or the electrode.
• If the measured offset isn’t within the preset limits (±45 mV), the meter will display the message
“Buffer Contaminated” alternatively with ”Electrode Dirty/Broken”.