LI-COR LI-6800 User manual

LI-6800 6×6 cm Leaf Chamber
The 6×6 cm Leaf Chamber is for large leaves. This doc-
ument provides installaion instructions for the large leaf
chamber. If the leaf fills less than half the chamber, we
recommend using the 3×3 cm chamber instead.
Detach the chamber from the head
Six screws will be removed to detach a chamber — two on
the connector cover, two on the latch mechanism, and two
that hold the chamber to the head.
Caution: Power off the instrument before following these
procedures.
1Remove the two cover screws and the connector
cover from the bottom of the head.
2Unplug the cables from the cable bulkhead (i.e.,
LI-190R, leaf temperature thermocouple, and light
source).
3Position the chamber latch in the parked position and
remove the two latch screws.
4Loosen both of the captive chamber screws until the
chamber is free of the head.
5Separate the chamber from the head.
Warning: Do not attempt to operate the mixing fan
without a chamber in place.
While the chamber is removed from the head, inspect the
Air Filters and Dust Trap. Clear any dust or debris before attach-
ing a chamber.
Installation Guide
1

Installing the 6×6 cm chamber
1Hold the chamber in position, with the latch springs up
toward the handle, and tighten the two captive cham-
ber screws (146-15344).
Caution: Use the captive chamber screws (part number
146-15344) to install the chamber. Other screws will
cause leaks and problems with the mixing fan.
Make them snug—turn each screw until it stops, and
then just a little bit more (up to ¼ turn). If you have a
torque screwdriver, tighten them to 2.5 N·m (22 inch
lbs).
2Install the latch screws.
With the latch open, tighten until they are snug. If you
have a torque screwdriver, tighten them to 1.1 N·m (9.4
inch lbs).
3If you unplugged the light sensor cable, install the
light sensor connector to the connection labeled PAR.
4Install the leaf temperature thermocouple connectors
to the connections labeled T1 and T2.
5Adjust the thermocouple height.
6Install the connector cover.
After swapping chambers, it is a good idea to verify that the
chamber is sealed and that the software recognizes it. Run
the leak test under Start up > System Tests > Chamber Leak.
Check to see that the chamber is recognized under Constants
> System Constants > ChType.
Copyright © 2020 LI-COR, Inc. All rights reserved.
984-16473•01/2020
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