USER MANUAL | ICOS | INSTRUCTIONS | UM/ICOS-EN REV. B.2
The Pretreatment Box for the GLA351-CCIA3
The pretreatment box dries the sample so the water concentration is maintained below
500 ppm.
The Pretreatment box:
Removes water from the sample
Removes water and CO
2
from the atmosphere to generate zero air
Replace the soda lime filter as needed (normally at six week intervals).
When the LithOlyme in the canister turns purple, it needs to be replaced.
The Soda Lime/Litholyme has a finite lifetime and will need to be replaced periodically.
Under continuous operation, one canister lasts approximately six weeks. The pretreatment
system includes a canister inside the box, which is sufficient for CO
2
scrubbing. However,
ABB-LGR recommends using an additional canister external to the pretreatment box as a
redundancy and to make monitoring and replacement easier. As the scrubber is exhausted,
it will change color from white to purple. (Figure 19) Since there is an additional canister
inside the pretreatment box, the Soda Lime/Litholyme in the external canister can be
replaced without any analyzer down-time.
Figure 19 shows LithOlyme in both fresh and depleted conditions.
Figure 19: LythOlyme (Fresh and Depleted)
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