USER MANUAL | ICOS | INSTRUCTIONS | UM/ICOS-EN REV. B.2
Modifying Zero-Air Intervals for the GLA351-CCIA3
The factory set zero-air interval is 4 hours; however, this can be modified for the particular
application. If the environment around the analyzer is relatively stable, the zero-air interval
can be set to 24 hours. Alternatively, if the environment around the analyzer is unstable, it
may be necessary to reduce the zero-air interval.
Altering the number of seconds for the sample changes the interval. (Figure 46)
Or, the
number of times to run the unknown gas sequence for each reference gas
sequence
may be changed. (Figure 46)
Factors that influence the stability of the environment include CO
2
concentration, humidity,
and barometric pressure.
Preventing the Zero-Air Sequence from Running for the GLA351-CCIA3
If you wish to prevent the zero-air sequence from running during an experiment, choose
one of these two methods:
If you know the duration of your experiment, change the number of seconds for the
sample under the
Unknown Gas Valve Sequence
column. Before beginning the test,
force the analyzer to measure zero-air first so that the full time for the sample will
pass before the zero-air is measured again. To do this:
1. Uncheck theMIU Enable checkbox
2. Click Save Changes
3. Check theMIU Enable checkbox
4. Click Save Changes again
This will start the sequence from the beginning.
The second method involves temporarily suspending the zero-air sequence.
1. Uncheck theMIU Enable checkbox
2. Click Save Changes
3. Check theMIU Enable checkbox
4. Click Save Changes
5. After 7 minutes, the zero air measurement will be complete.
6. Uncheck the MIU Enable checkbox
7. Click Save Changes.
8. Begin your experiment
9. After the experiment is complete, check MIU Enable
10. Click Save Changes so that the automated zero-air sequence will
resume.
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