EL3060 CONTINUOUS GAS ANALYZERS | OI/EL3060-EN REV. A 65
Gas feed system
Purging times
The purging time settings for the individual phases of the calibration deter-
mine the period of time that the gas feed paths are purged
• after switch-over from sample gas to zero reference gas until the start
of the zero-point calibration,
• after switch-over from zero reference gas to span gas until the start of
the end-point calibration and
• after switch-over from span gas to sample gas until the clearance of the
status signal "Maintenance mode"
so that gas residues do not distort the calibration or the measurement re-
sult.
The total purging time for each phase is the sum of the respectively set
purging time plus 3 × low pass time constant plus 1× low pass time constant
for non-linear filter.
NOTE
The purging time should be set at least three times the T
90
time of the over-
all analyzer system.
Calibration method
Analyzer Calibration method Remark
Uras26 Zero-point/end-point calibration cannot be changed
Magnos206, Magnos28 Zero-point/end-point calibration
or
substitute gas calibration
or
single-point calibration
If a substitute gas component has been
installed in the Magnos206 (see page 73)
or Magnos28 (see page 75) analyzer, the
substitute gas calibration is set ex works
as the calibration method; otherwise, the
zero-point/end-point calibration is set.
The single-point calibration can be se-
lected as an alternative.
Caldos27 Single-point calibration with standard gas (see page 77); cannot
be changed
Caldos25 Zero-point/end-point calibration
or
substitute gas calibration
If a substitute gas component has been
installed in the Caldos25 (see page 79)
analyzer, the substitute gas calibration is
set ex works as the calibration method;
otherwise, the zero-point/end-point cali-
bration is set (cannot be changed).
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