MSA Sirius Mode D'emploi page 64

Figure 6-3a. Ion Chamber Housing Cleaning
Figure 6-3b. Ion Chamber Cleaning
8. Snap the ion chamber into the cell holder, with the four small,
round holes facing up as in FIGURE 6-4.
9. Replace the ion chamber cover, aligning the notch to ensure
proper orientation.
10.Check that the o-rings are seated in their proper locations (see
Replacing the Filters).
6-8