BUCHI SpeedExtractor E-916 - Manual (Page 66)

7 Maintenance
66 SpeedExtractor E-916/E-914 Operation Manual, Version D
Exhaust connections
A good indication for clogged needles or EXHAUST lines is a reproducible residual pressure of approx.
1 – 2 bar after each run. In this case the lift does not open and an error message appears (see sec-
tion 8.1.2). Other evidence for possibly clogged needles or lines is a difference in receiving volumes
after flushing the system (see section 6.2.6). But note that there are other possible causes for unequal
solvent volumes after flushing such as bent needles or clogged frits.
NOTE
The ferrules can only be used once because they get deformed when the FEP tube is fixed in place.
Replacement set (qty 25): P/N 044816.
Waste connection
The FEP tubes (OD 1/16") to the waste are fixed with gray fer-
rules and fittings (1/4 UNF-28 D 1/16"). To reduce any dead
volume and potential sources of contamination, make sure
that the ferrule is always flush with the end of the tube. The
pointed end of the ferrule is oriented to the fitting.
Use the optional 7-port safety cap (P/N 11056948) to con-
nect the waste tube with the waste container.
a
Gas connection
The line from the nitrogen tank to the instrument is
connected with quick-lock mechanism. To replace the
tube, make sure there is no pressure on the line, push
in the inner movable part a of the connector and take
out the tube. There are no items to be unscrewed. To
connect the new tube, push in the metal piece a again
and insert the new tube as far as it will go. Release the
part a. Check the tightness of the lines by closing the
media valve and pressure reduction valve on the nitro-
gen tank and observing the pressure decrease over
time. If there is constant leaking, inspect the tube and
connector and replace them if necessary.