302 Agilent 1260 Infinity DAD and MWD User Manual
14
Appendix
Installation of Stainless Steel Cladded PEEK Capillaries
Installation of Stainless Steel Cladded PEEK Capillaries
The 1260 Infinity Bio-inert LC system uses PEEK capillaries that are cladded
with stainless steel. These capillaries combine the high pressure stability of
steel with the inertness of PEEK. They are used in the high pressure flow path
after sample introduction (loop/needle seat capillary) through the
thermostatted column compartment/heat exchangers to the column. Such
capillaries need to be installed carefully in order to keep them tight without
damaging them by over-tightening.
Installation procedure
The amount of force/torque needing to be applied to install the capillary
depends on
• the female connector to which the capillary is installed, and whether the
material of that connector is soft or hard. Compared with hard connectors,
a greater tightening angle is required for soft connectors to achieve same
torque.
• whether the capillary is installed for the first time or subsequent times. For
the first time, a greater tightening angle needs to be applied.
The installation consists of two steps. In the first step, the fitting is installed
finger-tight without using tools. Finger-tight means that the fitting will grip
and hold the capillary. This brings the fitting to the appropriate start position
(marked as 0 ° below) for the second step.
This installation procedure applies for capillaries and corresponding fittings used in
modules delivered before January 2013. For current capillaries and fittings, see “Installing
UHP-FF Fittings” on page 55.
Handling of stainless-steel-cladded PEEK capillaries
Be careful when installing stainless-steel-cladded PEEK capillaries. The correct torque
must be applied to avoid leaks potentially causing measurement problems or damage
to the capillary.
➔ Follow the procedure below for a correct installation
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