3.14
77 is the parameter number for zero calibration, 0.01 is a status message which indicates a
successful zero calibration. Other values indicate an error and the zero has not been
calibrated. See Table 3.1 for a listing of manual calibration error messages.
Note: With 0110066X software, performing a zero calibration loses the previous span
calibration. Therefore a new span calibration must follow a zero calibration.
See Appendix 6 for effect of background gases and how to compensate for them.
3.6.2 Span Calibration
A span calibration cannot be performed until a successful zero calibration has been done.
However, a span calibration can then be performed independently of zero calibration. This
allows the span to be set more frequently than the zero. A span calibration is performed using
the keys:-
CAL SPAN
8
1. Introduce span gas into the analyser at a cell flow rate of 100 to 250ml/min,
(max 150ml/min for 313 and 264 cells).
2. Allow the oxygen reading to stabilise.
3. Enter the password.
4. The span calibration is done by pressing:
SET CAL SPAN
8
ENTER
The display should show:
0.01 78
78 is the parameter number for span calibration, 0.01 is a status message which indicates a
successful calibration. Other values indicate an error and that the span has not been
calibrated. See Table 3.1 for a listing of manual calibration error messages.
If the analyser is fitted with 0110066X software then the span calibration is lost when a zero
calibration is done. A span calibration must always be done after a zero calibration.
The span calibration is not lost if 0110067X or 0110068X software is fitted.
See Section 5.3.6.10 for adjustment of coarse span resistors.
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