LI-COR LI-7500, Instruction Manual

Page: 99 / 155

Section 5
5-6 Maintenance
Filter Paper
Mg(ClO
4
)
2
Ascarite II
Figure 5-4. Fill the bottles with Ascarite II,
followed by magnesium perchlorate.
2. Before removing the bottles, prepare the new bottles (in spares kit) by filling them
with equal parts Ascarite II and magnesium perchlorate (Figure 5-4). Fill the bottles
half full with Ascarite II first, followed by the magnesium perchlorate. Place a filter
paper disk in the lid to keep the chemicals from spilling into the detector housing.
3. There are two bottle covers, each with an O-ring seal, at the base of the sensor head
(Figure 5-5). Remove the cover retention screw. Thread a 6/32" screw (there is one
2 inches long in the spares kit) into each cover and pull straight out.