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3 Installation
940 Professional IC Vario TWO (2.940.2100)
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15
Also see:
PEEK pressure screws 1x1
video on the Internet
.
Connection capillaries
PEEK capillaries and PTFE capillaries are used in the IC system.
PEEK capillaries (poly-
etheretherketone)
PEEK capillaries are pressure-stable up to 400 bar (depending on the inner
diameter), flexible, chemically inert and have an extremely smooth surface.
They can be readily cut down to the desired length with the capillary cut-
ter (6.2621.080).
Use:
￭
PEEK capillaries with an inner diameter of 0.25 mm (6.1831.010) for
the entire high-pressure section.
￭
PEEK capillaries with an inner diameter of 0.5 mm (6.1831.180) for the
sample path.
PTFE capillaries
(poly(tetrafluoroethy-
lene))
PTFE capillaries are transparent and enable visual tracing of the liquids to
be pumped. They are chemically inert, flexible and temperature-resistant
up to 80 °C. They can be readily cut down to the desired length with the
capillary cutter (6.2621.080).
Use:
PTFE capillaries (6.1803.0x0) are used for the low-pressure section.
￭
PTFE capillaries with an inner diameter of 0.5 mm for sample process-
ing and for the transfer of rinsing solutions (they are not necessarily
included in the scope of delivery of the instrument).
Capillary connections
NOTE
Sprays of chemicals caused by capillaries slipping out
If you work with an increased system pressure (> 15 MPa), capillaries
may slip out of the pressure screws. This can lead to sprays of chemi-
cals.
To avoid this, we recommend
￭
degreasing the ends of the capillaries before installing them.
Dampen a cloth with acetone and wipe off the ends of the capilla-
ries before connecting them with the pressure screws.
￭
tightening the pressure screws firmly using a wrench (6.2739.000).
In order to achieve optimum analysis results, capillary connections in an IC
system must be absolutely tight and free of dead volume. Dead volume
