General Information
There is a small amount of residual oil inside the CO
2
cylinders used with the 6400-01 CO
2
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
2
injector, if you are
unable to attain high enough CO
2
levels (>2000 ppm), or if the CO
2
takes more than 3 minutes to
stabilize at the upper limit during mixer calibration, and you are using a fresh CO
2
cylinder and
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:
1. Place the source mounting block into a vise.
2. Loosen the nut at the base of the “T” fitting
(Figure 1).
3. Loosen the other nut at the top of the copper
supply tube, and discard the supply tube, nuts,
and attached ferrules.
4. Remove the fitting containing the flow restrictor
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.
5. There are 2 nuts in the kit that have ferrules pre-
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.
Installation Instructions for the LI-6400 Portable Photosynthesis System
6400-928 Flow Restrictor
Field Kit
LI-6400 Portable
Photosynthesis System
LI-6400 Portable
Photosynthesis System
Figure 1. Remove the two nuts at each end of the
copper supply tube. Discard the old tube and attached
ferrules.
Remove this fitting
and discard
Teflon tape
Source mounting
block
"T" fitting
Copper supply tube
Nut/Ferrule
Nut/Ferrule
(over)
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