Metrohm 2.792.0020 Basic IC, Инструкция по эксплуатации, Страница: 37 / 197

2 Installation
792 Basic IC
28
2.7 Precolumns and separating columns
2.7.1 General information on precolumns
The use of easily exchangeable precolumns protects the separating
columns and prolongs their lifetime. The precolumns available from
Metrohm (see section 6.3.2 ) are either real precolumns or precolumn
cartridges, which are used together with the 6.2821.050 Twin cartridge
holder or the 6.2828.110 Precolumn cartridge holder.
New IC precolumns are normally filled with solution and sealed at both
ends. Before the precolumn is installed in the system, it must be
ensured that this solution is freely miscible with the eluent used
(check manufacturer's specifications).
2.7.2 Precolumns with twin cartridge holder
The 6.1005.020, 6.1005.040, 6.1005.050, 6.1007.010 and 6.1010.010
Precolumn cartridges are installed in the 6.2821.050 Twin cartridge
holder as follows (see Fig. 10 ):
1 Install cartridge
x
Insert inlet capillary 55 55 55 55 with end piece for precolumn cartridge
in Manufit housing
56
56 56
56
.
x
Insert outlet capillary
61
61 61
61
with end piece for precolumn car-
tridge in Manufit pressure screw 60 60 60 60 .
x
Remove end caps from the precolumn cartridge 59 59 59 59 (the steel
mesh
58
58 58
58
and gaskets
57
57 57
57
are already inserted in the car-
tridge).
x
Fit the two capillary end pieces onto the precolumn cartridge
59 59 59 59 (comply with the flow direction if specified on the column).
x
Screw Manufit pressure screw 60 60 60 60 and Manufit housing 56 56 56 56
firmly together.
2 Connect precolumn
x
Cut inlet capillary
55
55 55
55
of the assembled precolumn to the
desired length and mount a compression fitting 46 46 46 46 (see sec-
tion 2.5 ).
x
Connect inlet capillary
55
55 55
55
either using the Coupling
26
26 26
26
to the
column connection capillary 20 20 20 20 mounted on the injection
valve or directly to connection "4“ of injection valve A.
x
Shorten outlet capillary
61
61 61
61
of the precolumn to ca. 5 cm and
mount a compression fitting 46 46 46 46 (see section 2.5 ).