XNX Universal Transmitter
Proof Testing Procedure
10
Adjusting
6.2.2.1 Zero Gas Calibration
Sensor Reading
at Current Settings
Figure 4. Zero Gas Calibration Screen
As the sensor detects the zero gas and the concentration
increases, the values displayed will reflect the changing
concentration. When the concentration values are stable
select
✓
to allow the XNX to calculate the zero adjustment.
Selecting
✖
will return to the Gas Calibration Menu.
Figure 5. Zero Gas Calibration in Progress
3. If the Zero Gas Calibration is successful, the Zero Passed
screen displays.
Figure 6. Zero Gas Calibration Passed
6.2.2.2 Span Calibration
NOTE:
If a Span Calibration is not required, select
✖
to skip the Span
Calibration and return to the Calibration Menu.
1. When the Zero Gas Calibration is complete, the Span
Concentration screen appears. The gas concentration for
the Span Gas Calibration can be changed.
If the Span Calibration is skipped, the Gas Calibration screen
displays.
Figure 7. Span Gas Concentration Screen
2. Enter the concentration of the span gas by selecting
✓
to
choose the first digit and use the
switches to increment
or decrement the values. Use
✓
to accept the new value
and move to the next digit. Continue until all digits have
been selected.
Sensor Reading
at Current Settings
Calibration Gas
Concentration
Figure 8. Span Calibration Screen
3. Apply the span gas. As the sensor detects the gas and the
concentration increases, the values displayed will reflect the
changing concentration. When the concentration values are
stable select
✓
to perform the span. The Span Calibration
process also determines whether the sensor is within the
