LI-COR LI-6400 Installation Instructions

6400-928 Flow Restrictor
Field Kit
Installation Instructions for the LI-6400 Portable Photosynthesis System

General Information

There is a small amount of residual oil inside the CO
Injector. If the oil filters are not replaced on a regular basis, the oil can enter the flow path via the
copper supply tube and clog the flow restrictor. During operation of the CO
unable to attain high enough CO
stabilize at the upper limit during mixer calibration, and you are using a fresh CO
oil filter, it may indicate that the flow restrictor is clogged.
The flow restrictor must be replaced if it becomes clogged. The restrictor is pressed into the fitting
connected to the top of the copper supply tube (Figure 1), and can not be removed; you must
replace the entire fitting. A kit is available (part #6400-928) that includes a fitting with the new
restrictor, nuts with integral ferrules, and copper supply tube.
■ To replace the flow restrictor assembly:
Place the source mounting block into a vise.
1.
Loosen the nut at the base of the "T" fitting
2.
(Figure 1).
Loosen the other nut at the top of the copper
3.
supply tube, and discard the supply tube, nuts,
and attached ferrules.
Remove the fitting containing the flow restrictor
4.
and discard. Install the new fitting/restrictor.
Note that the fitting is wrapped at one end with
teflon tape (Figure 1). Insert this end into the
source mounting block and tighten securely.
There are 2 nuts in the kit that have ferrules pre-
5.
installed. Insert the short end of the copper sup-
ply tube up through the bottom of the nut (op-
posite the threaded end). Insert the long end of
the copper supply tube up through the nut and
into the flow restrictor fitting. Push the short
end of the copper supply tube up into the "T"
fitting as far as it will go, and tighten the nut
(tighten only a few turns; don't overtighten).
Tighten the nut on the flow restrictor until it stops.
levels (>2000 ppm), or if the CO
2
(over)
cylinders used with the 6400-01 CO
2
2
takes more than 3 minutes to
2
Figure 1. Remove the two nuts at each end of the
copper supply tube. Discard the old tube and attached
ferrules.
2
injector, if you are
cylinder and
2
Source mounting
block
Teflon tape
Remove this fitting
and discard
Nut/Ferrule
"T" fitting
Nut/Ferrule
Copper supply tube