ZIROX XS22, Manual

Page: 16 / 27

Measuring system XS22-E2010 6 Parametrization
16
XS22_E2010
6.4 Zero calibration
The E2010 has a calibration function. Based on that function the zero point
calibration and, if requested, the span gas calibration can be conducted (see
figure 6). The zero calibration must be conducted in clean air.
It serves the balance of the offset voltage of the ZrO
2
-sensor. The offset is
caused by the construction (when the electrode has a disadvantageous
position in the heating field) and can occur due to aging of the sensor.
Before calibration, the sensor is flushed with ambient air. The gas flow is set
by internal or external pump at the value which is used for measuring the
measuring gas.
With the zero calibration, the working point in ambient air is calibrated with
20.64 vol. % O
2
.
6.5 Span gas calibration
After calling the SPAN GAS concentration in the calibration menu (see figure
6, p. 22) the setting options are activated by pressing the enter key. The
flashing digit can be set by pressing the menu key. After changing all the
digits this menu is deactivated by ENTER and left by the menu key.
Now the calibration can be started.
6.6 Reset calibration
If in the main menu CALIB.ZERO POINT or CALIB. SPAN GAS is displayed
and both keys are pressed for 3 seconds, RESET CAL.ZERO? or RESET
CAL.SPAN will be displayed.
By pressing ENTER, the calibration values will be reset to 0 or 1.
6.7 Error messages during calibration
CALIBR. FAILED
OUT OF RANGE //
limits: ±50mV resp. ±50% of Vz
CALIBR. FAILED
* TIMEOUT * //
no steady measuring value in 20sec
.
NOTE