8-C-6
Chapter 8: Gas Analyzer Calibration
42/24-10 EN Rev. 9
Limas11: Notes for Calibrating,
continued
Limas11 with Internal
Cross-Sensitivity
Correction
During calibration cross-sensitivity and / or carrier gas corrections by other meas-
urement components are switched off. Therefore, the following notes should be
observed:
For zero-point calibration
all
sample components must be calibrated in the
following sequence:
•
First that sample component which is not corrected,
•
Afterwards that sample component which is affected by the smallest number of
corrections,
•
Up to that sample component which is affected by the largest number of
corrections.
Sample components
NO, SO
2
, NO
2
Cross-sensitivity correction
NO by SO
2
and NO
2
,
SO
2
by NO
2
,
NO
2
not corrected.
Example:
Sequence for zero-point calibration
1
st
NO
2
– 2
nd
SO
2
– 3
rd
NO.
For end-point calibration likewise
all
sample components must be calibrated. In
doing so, a corrected sample component should be calibrated only using a test
gas containing no components which cause cross-sensitivity, i.e. consisting only
of the measurement component and an inert gas like N
2
.
Wait Until End of
Warm-Up Phase
The Limas11 analyzer module should only be calibrated after the warm-up phase,
i.e. approx. 1.5 hours after connecting the power supply.
