Operation
117
4.5 ISE Calibration
Why calibrate?
Ion sensitive electrodes age and are temperature depen-
dent. This changes the slope. As a result, an inexact mea-
sured value is displayed. Calibration determines the current
values of the slope of the electrode and stores it in the instru-
ment.
Thus, you should calibrate before each measurement (if
possible), and at regular intervals.
Note
For calibration, use tempered standard solutions with a tem-
perature that differs by maximum
±
2 °C from the tempera-
ture of the test sample.
When to calibrate?
l
Before each ISE measurement if possible
l
After connecting another electrode
l
When the sensor symbol flashes after a voltage interrup-
tion, e.g. battery change.
ConCal
is the conventional two-point calibration or three-point cali-
bration with 2 or 3 freely selectable buffer solutions. The
concentration of the calibration standards depends on the
concentration that is expected to be measured.
AutoRead
In calibration, the AutoRead function is automatically acti-
vated.
The current AutoRead measurement (with acceptance of
the current value) can be terminated at any time by
pressing
g
.
TP display
If you use a temperature probe, a flashing TP display indi-
cates that the temperature difference between the test sam-
ple and the standard solutions is too high (
±
2 °C).
Summary of Contents for inoLab Oxi Level 2
Page 12: ...Safety 96 ...
Page 78: ...Technical Data 158 ...
Page 81: ...Appendix 165 9 Appendix ...
