Maintenance & Service
Servicing the External CO2 Source Assembly
19-34 Using the LI-6400
19
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To replace the flow restrictor and clean the copper supply tube:
1 Loosen two nuts, remove supply tube
One is at the base of the ÒTÓ fitting (Figure 19-28), and the other is at the top
of the copper supply tube.
2 Clean the supply tube
To remove any oil that may be present in the copper supply tube, flush thor-
oughly with an organic solvent (e.g. acetone) that leaves no residue. If thatÕs
not possible, use hot, soapy water (dishwashing soap works well), and rinse
thoroughly with clean water.
Blow out the tube to ensure no droplets are left inside. If any droplets get up
into the flow restrictor, it will become clogged.
3 Replace the flow restrictor
Remove and discard the fitting containing the flow restrictor. Install the new
fitting/restrictor (LI-COR part #9964-042). Note that the fitting is wrapped at
one end with Teflon tape (Figure 19-28). Insert this end into the mounting
block and tighten securely.
Figure 19-28. Remove the two nuts at each end of the copper supply tube.
Loosen this nut
Fitting with flow restrictor
Loosen this nut
"T" fitting
Copper supply tube
Remove this fitting
and replace
Ferrule
Ferrule
Teflon tape
"T" fitting
Copper supply tube
Nut
Nut
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