23
22
Wrong slope
The calibration cannot be confirmed.
The evaluated slope is less than the lowest accepted value (80% of
default slope).
The evaluated slope is more than the highest accepted value (110 % of
default slope).
Wrong buffer
The calibration cannot be confirmed.
The pH reading is not close to the selected buffer. Select another buffer
using the
ARROW
keys or change the buffer.
“
Electrode Dirty/Broken
“ alternatively with “
Buffer Contaminated
“.
The calibration cannot be confirmed.
The offset of the electrode is not in the accepted range. Check if the
electrode is broken or clean it following the CLEANING PROCEDURE (see
page 74). Check the quality of the buffer. If necessary, change the
buffer.
FOUR, THREE or TWO-POINT CALIBRATION
• Proceed as described in “FIVE-POINT CALIBRATION” section.
• Press
ESC
after the appropriate accepted calibration point. The
instruments will return to calibration screen and will memorize the
calibration data.
SINGLE-POINT CALIBRATION
There are two selectable options for a single-point calibration:
Replace
and
Offset
.
This option is configured in SETUP mode under the parameter First Point
Mode. In both cases the meter will alter the present calibration data in
the instrument. If
“Replace”
is selected a new calibration point will be
added to the existing data, and the slope is calculated. The slopes
between current buffer and nearest lower and higher buffers will be
reevaluated.
If the
“Offset”
option is selected, an electrode offset correction is
performed to all buffer data keeping the existing slopes unchanged.
• Proceed as described in “FIVE-POINT CALIBRATION” section.
• Press
ESC
after the first calibration point was confirmed. The instruments
will memorize the single-point calibration data and will return to
calibration screen.
Notes:
• Press
MTC
key to toggle between pH buffer selection and the
temperature reading during calibration while temperature
probe is disconnected (
MTC
mode).
• The displayed arrow is moving to the temperature value.
Use
ARROW
keys in order to change the temperature.
ERROR SCREENS
Wrong temperature
The calibration cannot be confirmed.
If the temperature is less than 0 °C or greater than 100 °C during
calibration, the calibration cannot be confirmed.
