Metrohm 732 IC Detector - Manual (Page 26)

2.5 Capillary connections
732 IC Detector / 733 IC Separation Center
19
2.5 Capillary connections
2.5.1 Capillaries
Some of the connections under high pressure between the feed pump
and the detector block must be set up by the user. For metal-free sys-
tems, the 6.1831.010 PEEK capillary (i.d. = 0.25 mm, e.d. = 1 /
16
" ,
length = 3 m) must be used.
For non metal-free systems, the 6.1831.010 PEEK capillary can also
be used in the pressure range of 0 … 25 MPa (0 … 250 bar); on the other
hand, in the pressure range of 25 … 50 MPa (250 … 500 bar), which is
permissible only together with the non metal-free 2.709.0010 version of
the 709 IC Pump, the 6.2620.020 Steel capillary (i.d. = 0.25 mm,
e.d. = 1 /
16
" , length = 3 m) must be used.
With PEEK capillaries the connection is made preferably with the
6.2744.010 PEEK connectors, with steel capillaries, the connection is
made preferably with 6.2620.000 and 6.2620.010 steel connectors (see
section 2.5.2 and section 2.5.3).
Capillaries fitted with new connectors must have a perfectly flat cut
surface. For PEEK capillaries it is best to use the 6.2621.080 Capil-
lary tubing cutter, for steel capillaries the 6.2621.040 Capillary
tubing cutter (both available as an option).
2.5.2 Steel connectors
For the connection of steel capillaries, the steel connectors 6.2620.010
Ferrule and 6.2620.000 Pressure screw available as an option can
be used. Proceed as follows:
1 Mount connectors
Slide a pressure screw 50 50 (6.2620.000) and a ferrule 49 49
(6.2620.010) over the end of the capillary 51 51 to be fastened as
shown in Fig. 9.
2 Insert capillary in connection
Push capillary end into the corresponding connection as far as it
will go (to avoid dead volume).
3 Tighten compression fitting
Tighten pressure screw 50 50 with the open-end spanner 1 /
4
"
(6.2621.050) supplied.
For the connection of capillaries to the injection valves, use only the
special steel connections contained in a plastic bag affixed to the
valve (or as an alternative the 6.2744.010 PEEK compression fittings).
If other steel connectors are used (e.g. 6.2620.000 and 6.2620.010),
the valve connection may be damaged!