8-C-14 Chapter 8: Gas Analyzer Calibration 42/24-10 EN Rev. 9
Uras26: Notes for Calibrating, continued
Uras26 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 CO
2
, CH
4
, C
3
H
6
Cross-sensitivity correction CO
2
by CH
4
,
CO
2
by C
3
H
6
,
C
3
H
6
not corrected.
Example:
Sequence for zero-point calibration 1
st
C
3
H
6
– 2
nd
CH
4
– 3
rd
CO
2
.
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 Uras26 analyzer module should only be calibrated after the warm-up phase,
i.e. approx. 2 hours after connecting the power supply.
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