1 4
• After the fourth calibration point is confirmed, immerse the pH electrode and the
temperature probe approximately 4 cm (1½”) into the fifth buffer solution and
stir gently. The temperature probe should be close to the pH electrode.
• If necessary, press the
ARROW
keys to select a different buffer value.
• The “ ” tag will blink on the LCD until the reading is stable.
• When the reading is stable and close to the selected buffer, “CFM” tag blinks.
• Press
CFM
to confirm calibration.
• The instrument stores the calibration values and
returns to normal measurement mode.
FOUR, THREE or TWO-POINT CALIBRATION
• Proceed as described in “FIVE-POINT CALIBRATION” section.
• Press
CAL
after the appropriate accepted calibration
point. The instruments will return to measurement
mode and will memorize the calibration data.
ONE-POINT CALIBRATION
Two SETUP selectable options are available for one-point calibration: “Pnt”
and “OFFS”.
If the “Pnt” option is selected, the adjacent slopes will be reevaluated.
If the “OFFS” option is selected, an electrode offset correction is performed
keeping unchanged the existing slopes.
• Proceed as described in “FIVE-POINT CALIBRATION” section.
• Press
CAL
after the first calibration point was
confirmed. The instruments will memorize the
one-point calibration data and will return to
measurement mode.
Notes:
• Press
2nd
then
MODE
to toggle between pH buffer and temperature
reading during calibration.
• If the value measured by the instrument is not close to the selected
buffer, “WRONG” “ ” and “WRONG” “ ” tags will blink alter-
nately. In this case check if the correct buffer has been used, or
regenerate the electrode by following the Cleaning Procedure (see
page 43). If necessary, change the buffer or the electrode.
• If the buffer temperature or the manual temperature exceeds
the temperature limits of the buffer, “WRONG” “ ” tags and
temperature reading will blink.
• If “WRONG” tag and “OLd” message on the secondary LCD are
displayed blinking, an inconsistency between new and previous (old)
calibration is detected. Clear old calibration parameters and proceed
with calibration from the current calibration point. The instrument will
keep all confirmed values during current calibration.
LOG CFM
CAL GLP
CAL GLP