Oakton ION 5 Acorn Series, Operating Instructions Manual

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NOTE : This meter has automatic buffer recogni-
tion which identifies the correct pH buffer values
during calibration. If buffers other than 4.01, 7.00
or 10.00 are used, or the electrode has worn out,
the LCD will flash "Er1".
See figure
Press CAL key to clear.
Temperature calibration
(ION 6 meter only)
The temperature sensor included with your meter is factory calibrated. Over time,
the temperature calibration may drift and require recalibration. If you replace the
probe you should calibrate temperature prior to pH calibration.
1.
Connect your temperature probe to the meter.
2.
Press the MODE key until "°C" appears
in the LCD.
3.
Compare displayed value to a NIST certified
thermometer or other thermometer known
to be accurate. For best accuracy, place
probe and thermometer in a constant
temperature bath.
4.
Press the CAL key. The LCD shows "CA"
and the reading flashes.
See figures
5.
Use the
▲
and
▼
keys to adjust the
temperature shown to match the accurate
temperature (maximum adjustment is
±5°C from factory default).
6.
Press ENTER key to confirm calibration.
The LCD displays "CO", and the meter
then reverts to measurement mode.
13 12
4.4
4.5
C
A
C
B
C
A B
Resetting calibrated values to default values
When you calibrate the pH mode of the Ion 6 meter, old pH calibration data is
written over on a point by point basis. If when recalibrating you do not calibrate at
all three points, the old data may result in errors. You can reset the meter to factory
calibration values using the following procedure.
1.
TURN METER OFF.
Meter must be OFF in order to reset calibration values.
2.
Press and hold the CAL key while switching on the meter using the ON key.
Hold the CAL key until the display shows "rSt".
3.
Press ENTER key to confirm. The meter automatically clears all stored pH
calibration values and reverts to Ion measurement mode.
Press MODE key instead of ENTER if you do not wish to reset. Meter will maintain
current calibration values and return to the Ion measurement mode.