LI-COR LI-6800 Installation Manual

LI-6800 Multiphase Flash Fluorometer
The Multiphase Flash™ Fluorometer is used to measure gas
exchange and chlorophyll fluorescence from leaves. It can
also function as a basic light source. Remove any currently-
installed chamber prior to installing the fluorometer.

Removing a chamber

Caution: Power off the
instrument before following
these procedures.
Remove the connector
1
cover from the bottom of
the head (see the
instruction manual).
2 Unplug the light sensor
cable and temperature
thermocouple cable from
the cable bulkhead.
3 Open the chamber and remove the two latch screws.
Completely loosen both of the chamber screws
4
(about 9 revolutions).
Remove the chamber.
5

Installing the fluorometer

The Multiphase Flash™ Fluorometer and the chamber latch
both attach to the head with two screws.
Caution: Power off the instrument before following these
procedures.
While the chamber is removed from the head:
1
Check the Chamber O-ring
for damage. Replace if
needed. There is an
extra in the spares kit
(part number 192-
14438).
Check the Chamber
Electronics Gasket for
damage. Replace if damaged (part number 6568-
327).
Inspect the Head Air Filters and Dust Trap. Clear any
dust or debris, and replace any damaged filters (see
Replacing the head filters in the instruction manual).
Inspect the flexible ducts on the lower chamber.
Replace them if they are visibly damaged (this
should rarely happen, but see Replacing the
chamber ducts in the instruction manual for
details).
Hold the fluorometer chamber in position, with the
2
latch springs up toward the handle, and tighten the
two captive chamber screws.
Make them snug—turn each screw until it stops (8 to
9 revolutions), and then just a little bit more. If you
have a torque screwdriver, tighten them to 2.5 N·m
(22 inch lbs).
3 Install the chamber latch screws.
With the latch open, tighten the screws until they are
snug. If you have a torque screwdriver, tighten them
to 1.1 N·m (9.4 inch lbs). Double check the tightness
of each screw.
If you unplugged the light sensor cable, install the
4
light sensor connector to the connection labeled PAR.
Install the leaf temperature thermocouple connector
5
to the connection labeled T1. Install the connector
cover.
Plug the connector into the console.
6
The fluorometer cable and head cable can be plugged
into either Head (1) or Head (2) connector. The
connectors are interchangable.
Installation Guide
1