LI-COR LI-7815, Instruction Manual

Page: 66 / 98

Section 6. Maintenance
Replacing the air inlet filter
The air intake has filters that may become contaminated periodically. We recom-
mend replacing filters every year, or more often if you are sampling dirty or dusty
air. The filters also should help prevent water from being drawn into the gas ana-
lyzer.
1
Power off the instrument.
2 Remove each of the six screws that secure the air intake and outlet.
They are installed with thread locking compound, which will make them difficult to
remove.
3
Remove the O-rings, the filter support disks, and the filter.
Use a toothpick to work them out.
4 Inspect the O-rings and replace them if they are damaged or compressed.
5
Install the replacement filters and reassemble the system.
Install two filters (part number 9978-234) between the support disks. The two metal
discs support the filter(s) — one on each side. Align the centers of the filters and the
metal disks. Assembly is the reverse of disassembly. You do not need to use thread
locking compound on the threads. Tighten them snugly.
6-4 LI-7815 CO₂/H₂O Gas Analyzer