Waters SunFire Columns - Manual (Page 7)

[ Care and Use ManUal ]
7
The presence of a void in the flow stream reduces column performance.
This can occur if a Parker style ferrule is connected to a Waters endfitting
(Figure 3).
Void
Figure 3: Parker Ferrule in a Waters Style Endfitting
Note: A void appears if tubing with a Parker style ferrule is connected
to a Waters style column.
There is only one way to fix this problem: Cut the end of the tubing with
the ferrule, place a new ferrule on the tubing and make a new connection.
Before tightening the screw, make sure that the tubing bottoms out in
the endfitting of the column. Conversely, if tubing with a Waters ferrule
is connected to a column with Parker style endfitting, the end of the
tubing will bottom out before the ferrule reaches its proper sealing
position. This will leave a gap and create a leak (Figure 4).
Gap
Figure 4: Waters Ferrule in a Parker Style Endfitting
Note: The connection leaks if a Waters ferrule is connected to a
column with a Parker style endfitting.
There are two ways to fix the problem:
1. Tighten the screw a bit more. The ferrule moves forward, and
reaches the sealing surface. Do not overtighten since this may
end in breaking the screw.
2. Cut the tubing, replace the ferrule and make a new connection.
Alternatively, replace the conventional compression screw
fitting with an all-in-one PEEK
® fitting (Waters Part Number
PSL613315) that allows resetting of the ferrule depth.
(Note: PEEK fittings are not recommended for normal-phase
applications!) Another approach is to use a Thermo Corporation
SLIPFREE
® connector to always ensure the correct fit.
The fingertight SLIPFREE connectors automatically adjust to fit all
compression screw type fittings without the use of tools (Figure 5).
Figure 5: Single and Double SLIPFREE Connectors
SLIPFREE Connectors Features
 Tubing pushed into endfitting, thereby guaranteeing
a void-free connection
 Connector(s) come(s) installed on tubing
 Various tubing i.d. and lengths available
 Fingertight to 10,000 psi – never needs wrenches
 Readjusts to all column endfittings
 Compatible with all commercially available endfittings
 Unique design separates tube-holding function
from sealing function
table 4. Waters Part numbers for SlIPFree Connectors
SlIPFree ® type tubing Internal diameter
tubing length 0.005” 0.010” 0.020”
Single 6 cm PSL 618000 PSL 618006 PSL 618012
Single 10 cm PSL 618002 PSL 618008 PSL 618014
Single 20 cm PSL 618004 PSL 618010 PSL 618016
Double 6 cm PSL 618001 PSL 618007 PSL 618013
Double 10 cm PSL 618003 PSL 618009 PSL 618015
Double 20 cm PSL 618005 PSL 618001 PSL 618017