13
Notes:
• If the value measured by the instrument is not close to the
selected buffer, “
WRONG
” “ ” and “
WRONG
” “ ” tags
will blink alternately. Check if the correct buffer has been
used, or clean the electrode by following the Cleaning
Procedure (see page 38). If necessary, change the buffer or
the electrode.
• When a custom buffer is displayed, the “
BUFFER pH
” tag
blinks. To change the custom buffer value in accordance
with the buffer temperature, proceed as described in
“WORKING WITH CUSTOM BUFFERS” (see page 14).
• If the buffer temperature or the manual temperature
exceeds the temperature limits of the buffer, “
WRONG
” tag
and temperature reading will blink.
• If “
WRONG
”, “
BUFFER pH
” tags and “
OLd
” message are
displayed blinking on the secondary LCD line, an inconsistency
between new and previous (old) calibration is detected.
Clear calibration parameters and proceed with calibration
from the current calibration point. The instrument will keep
all confirmed values during current calibration.
• To clear calibration parameters for all buffers starting with
current buffer, press
CLR
. The calibration will continue from
the current point. If this procedure is performed while
calibrating in the first point, the instrument returns to
measurement mode.
• Press
RANGE
to toggle between pH
buffer, calibration buffer number and
temperature reading.
• Each time a buffer is confirmed, the new calibration data
replaces the old calibration data for the corresponding buffer.
If current buffer has no previous data in the existing
calibration and the calibration is not full (five buffers), the
current buffer is added to the existing data. If the existing
calibration is full, the instrument asks which buffer to be
replaced.
36
PREPARATION PROCEDURE
Remove the protective cap of the pH electrode.
DO NOT BE ALARMED IF SALT DEPOSITS ARE PRESENT. This is normal
with electrodes. They will disappear when rinsed with water.
During transport, tiny bubbles of air may form inside the glass bulb
affecting proper functioning of the electrode. These bubbles can be
removed by “shaking down” the electrode as you would do with a glass
thermometer.
If the bulb and/or junction is dry, soak the electrode in
HI 70300
or
HI 80300
Storage Solution for at least one hour.
ELECTRODE CONDITIONING
AND MAINTENANCE