Calibration (Adjustment)
Intended Use
Because electrodes vary in their response,
you must calibrate (standardize) your
pH/mV meter and electrode to compensate
for electrode variation. The more fre-
quently you calibrate, the more accurate
your measurements.
Note on usage of the terms “standardize”,
“calibration” and “adjustment”: The pH
meter performs adjustments. In pH meter
jargon, however, one refers to “calibration”
or “standardization” instead of “adjust-
ment”.
Preparation
Calibrate the meter and electrode using at
least two buffers. The buffers should be in
the range of the minimum and maximum
pH values to be expected for the samples.
Printing Out Calibration Results
Only the most current calibration result can
be printed out.
Procedure:
1) Menu: Calibration functions:
Load calibration dataset
(see also Chapter “Default Settings”)
2) Then print out the calibration result by
pressing the z key.
ATC Probe
Calibration can be carried out with or
without an ATC probe. If an ATC probe
is connected, the meter adjusts continu-
ally for temperature during calibration
.
In this case, the pH value of the buffer
at the current temperature is taken into
account when calculating the slope of
the electrode.
When calibrating without an ATC probe,
the current temperature of each
buffer
solution must be entered manually:
1) Determining the current temperature
using a thermometer.
2) Start temperature entry:
Softkey
Temp
3) Set temperature value:
Softkey
q, softkey Q
4) Save temp value: Softkey
OK
15
Calibration for pH Measurement
Step Press key Display
1. If required, turn on meter e
2. Immerse the electrode in
a standard solution.
Stir gently.
Allow the electrode to reach
a stable value on the display.
3. Display current buffer set
and modify if required: m
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