ABB EasyLine EL3000 Operating Instruction page 121

EL3000 CONTINUOUS GAS ANALYZERS | OI/EL3000-EN REV. D
Gas feed system
Figure 63: 'Automatic calibration purge times'
Purge times
The purge time settings for each calibration phase determines
the time
• after switching from sample gas to zero point gas until the
start of zero point calibration,
• after switching from zero point gas to end-point gas or
between the end-point gases until the start of end-point
calibration, and
• after switching from end-point gas to sample gas until the
'Function check' status signal disappears
so that gas residues do not distort the calibration or the
measurement result.
The total purge time for each phase is the sum of each purge
time set plus a maximum 4 × the longest set low pass time
constant, see Set low-pass time constant on page 148.
Note
The purge time should be set to at least three times the T
of the entire analyzer system.
Pump
It must be set whether the built-in pump ('Integral gas feed'
option – in model EL3020 only, not for Limas23, ZO23, Fidas24) is
set to on or off during automatic calibration.
-time
90
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