User guide

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• When the reading is stable and close to the selected buffer,
“READY” message will appear and “CFM” message will blink.
• Press CFM to confirm calibration.
• The calibrated value is then displayed on the
primary LCD and the secondary LCD will display
the second expected buffer value.
Note: The instruments will automatically skip the buffer used for the
first point. It also skips 6.86 if 7.01 buffer was used and vice
versa. Likewise, it will skip 9.18 if 10.01 buffer was used and
vice versa.
• After the first calibration point is confirmed,
immerse the pH electrode and the temperature
probe approximately 4 cm (1½”) into the
second 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 “ ” symbol will blink on the LCD until the reading is stable.
• When the reading is stable, “READY” message will appear and
“CFM” message will blink.
• Press CFM to confirm calibration. The instrument
will return to measurement mode.
Notes: • If the value measured by the meter is not close to the
selected buffer, “WRONG ” and “WRONG ” messages
will blink alternately. In this case check if the correct buffer
has been used, or regenerate the electrode by following the
cleaning procedure (see page 18). If necessary, change the
buffer or the electrode.
• The “WRONG” message and temperature value are dis-
played blinking if the temperature reading is out of the
defined temperature range of the buffer. Calibration cannot
be confirmed in this situation.
CAL
2
BUF
pH
BUFFER pH
pp
pp
p
H CALIBRATIONH CALIBRATION
H CALIBRATIONH CALIBRATION
H CALIBRATION
Calibrate the instrument often, especially if high accuracy is required.
The instrument should be recalibrated:
• Whenever the pH electrode is replaced.
• At least once a week.
• After testing aggressive chemicals.
PREPARATIONPREPARATION
PREPARATIONPREPARATION
PREPARATION
Pour small quantities of the buffer solutions into clean beakers. If
possible use plastic or glass beakers to minimize any EMC interferences.
For accurate calibration and to minimize cross-contamination, use two
beakers for each buffer solution: one for rinsing the electrode and one for
calibration.
If you are measuring in the acidic range, use pH 7.01 as first buffer
and pH 4.01 as second buffer. If you are measuring in the alkaline
range, use pH 7.01 as first buffer and pH 10.01 or pH 9.18 as
second buffer.
PROCEDUREPROCEDURE
PROCEDUREPROCEDURE
PROCEDURE
Calibration has a choice of five memorized buffers: pH 4.01, 6.86,
7.01, 9.18 and 10.01.
It is recommended to perform a two-point calibration. However, one-
point calibration is also permitted by the instruments.
TWO-POINT CALIBRATIONTWO-POINT CALIBRATION
TWO-POINT CALIBRATIONTWO-POINT CALIBRATION
TWO-POINT CALIBRATION
• Submerge the pH electrode and the tempera-
ture probe approximately 4 cm (1½") into a
buffer solution and stir gently. The temperature
probe should be close to the pH electrode.
• Press CAL. The “CAL” and “
” messages will appear and
“7.01” buffer will be displayed on the secondary LCD.
• If necessary, press the ARROW keys to select a different buffer value.
• The “ ” symbol will blink on the LCD until the reading is stable.
CAL
1
BUF
BUFFER pH
CAL
pH