10-116
Using the LI-8150 Multiplexer
environment). Replace the filters when they become dirty, or if low, or no, flow
rates are present on the associated chamber. A filter kit (8 each) can be found in
the spares kit under p/n 8150-909; additional kits can be ordered from LI-COR.
Remove dirty or damaged filters by pressing on the quick-connect fittings and
pulling the tubing straight out; discard the tubing and old filter. Note the
orientation of the new filter; the arrow pointing toward the wider end of the filter
should point toward the solenoids. Attach the tubing near the solenoid first. The
tubing on the other end of the filter is longer than is required; route the tubing
toward the connector on the Multiplexer case, leaving a bit of slack, and cut to
length.
Attach tubing here
first
Figure 10-20. Note orientation of filters. Attach nearest the solenoids first, and cut the
tubing at the other end to length.
Solenoid Valves
Under normal operation the solenoid valves should not need to be replaced. If
however, a solenoid fails to open, it can be easily replaced. Note that each
solenoid has a manual override that can be used to test the mechanical opening of
each solenoid (they are normally closed). If it appears that a solenoid is not
opening (no flow), turn the blue screw on the top of the solenoid valve with a small
flathead screwdriver a quarter turn in either direction to manually open the
solenoid. If the solenoid does not open manually, it should be replaced. Solenoid
valves are available from LI-COR under p/n 300-08249 (1 ea.). Follow these steps
to replace a solenoid:
1. Power the LI-8150 off and open the lid.
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