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CALIBRATION MESSAGES
• Move sensor to next buffer or check buffer:
this message appears when the difference between the pH
reading and the value of the selected calibration buffer is significant. If this message is displayed, check
if you have selected the appropriate calibration buffer.
•
Wrong buffer temperature:
this message appears if the buffer temperature is out of the defined buffer
temperature range.
•
Clean the electrode or check the buffer. Press
to update calibration:
this message alerts
the user that some dirt or deposits could be on the electrode. Refer to the electrode Cleaning Procedure.
•
Slope too low. Please check the buffer / Slope too high. Please check the buffer:
these messages
appear if the current slope is under 80 % or over 110 % of default slope. Recalibrate the instrument
using fresh buffers.
•
Slope too low. Press
to clear old calibration / Slope too high. Press
to clear old
calibration:
verify the correct buffer has been selected and poured.
•
Unrecognized buffer. Please check the buffer or the buffer list
(for Semiautomatic and Automatic
buffer entry type): this message appears if the current buffer value is not close to any of the buffers from
the buffer list/group. Check if the current buffer is present in the buffer list or the appropriate buffer group
was selected.
•
The current buffer was already calibrated:
change the buffer or press
to exit calibration
mode.
Verify the pH electrode and instrument has been calibrated before making pH measurements.
DIRECT MEASUREMENT
To measure the pH of a sample using the Direct reading mode:
• Press
and then
to select
pH Measure
mode.
• Select the Direct reading mode (see pH Setup for details).
• Place the electrode tip and the temperature probe
approximately 4 cm (1
1
/
2
”) into the sample to be tested.
Allow time for the electrode to stabilize.
• The measured pH value will be displayed on the LCD,
together with a short GLP information and display preferences.
Note
: If the reading is out of range, “
----
” will be displayed
on the LCD.
DIRECT/AUTOHOLD MEASUREMENT
To measure pH of a sample using the Direct/AutoHold reading
mode:
• Press
and then
to select
pH Measure
mode.
• Select the Direct/AutoHold reading mode (see pH Setup for
details).
• Place the electrode tip and the temperature probe
approximately 4 cm (1
1
/
2
”) into the sample to be tested.
• The measured pH value will be displayed on the LCD. Press
and the “
AutoHold
” indicator will start blinking
on the LCD until the stability criterion is reached. The pH
value will be frozen on the LCD, along with “
AutoHold
” indicator.
pH MEASUREMENT
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