Metrohm 930 Compact IC Flex Oven/SeS/Deg User Manual download pdf (Page 22)

3.2 Capillary connections in the IC system

￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭

￭￭￭￭￭￭￭￭

930 Compact IC Flex Oven/SeS/Deg (2.930.2460)

Also see: PEEK pressure screws video on the Internet http://ic-

help.metrohm.com/maintenance.php?chapter=1_2.

Connection capillaries

PEEK capillaries and PTFE capillaries are used in the IC system.

PEEK capillaries (poly-

etheretherketone)

PEEK capillaries are temperature-resistant up to 100 °C, stable under pres-

sure 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 cutter (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 0.75 mm (6.1831.030) for

sample processing in the ultratrace range.

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.

￭ PTFE capillaries with an inner diameter of 0.97 mm for sample process-

ing and rinsing solutions (they are not necessarily included in the scope

of delivery of the instrument).

Capillary connections

NOTE

If you work with an increased system pressure (> 15 MPa), capillaries

may slip out of the pressure screws.

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 capillaries

before connecting them with the pressure screws.

In order to achieve optimum analysis results, capillary connections in an IC

system must be absolutely tight and free of dead volume. Dead volume

occurs if two capillary ends connected to each other do not fit exactly,

thus allowing liquid to escape. There are two possible causes for this:

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 112 113

Comments to this Manuals

No comments

Metrohm 930 Compact IC Flex Oven/SeS/Deg User Manual Page 22

Comments to this Manuals

Related products and manuals for Equipment Metrohm 930 Compact IC Flex Oven/SeS/Deg