Metrohm 820 IC Separation Center - Manual (Page 37)

2.7 Connection of 818 IC Pump
819 IC Detector / 820 IC Separation Center
29
2.7 Connection of 818 IC Pump
2.7.1 Electrical connection
For operation of the 819 IC Detector and 820 IC Separation Center you
can use any commercial HPLC pump. However, as the attainable sen-
sitivity depends to a large extent on the quality of the pump, Metrohm
advises use of the 818 IC Pump, which has been specially developed
for the demands of ion chromatography and has minimal pump pulsa-
tion and an outstanding flow constancy.
Startup and operation of the 818 IC Pump are described in the 818
Instructions for Use. The eluent, which must be degassed and filtered
(cf. Section 4.1.3), is selected on the basis of the separating column in-
stalled in the 820 IC Separation Center and the current separation prob-
lem.
The 818 IC Pump is normally integrated into the modular IC system via
830 IC Interface. Connect the RS 232 interface 17 of the 818 IC Pump
with a free RS 232 interface at the 830 IC Interface using the 6.2134.080
or 6.2134.090 cable according to the figure below. To ensure proper
functioning of the communication between the 830 IC Interface and 818
IC Pump, the sliding switch 16 on the IC pump must be set to "RS 232".
Fig. 17: Connection of 818 IC Pump to 830 IC Interface
2.7.2 Pulsation dampener
To protect the column material against pressure drops caused by the
injector, the use of a pulsation dampener connected between the pump
and the injection valve of the 820 IC Separation Center is recom-
mended. The optional 6.2620.150 Pulsation dampener (see Section
6.3) is very well suited to this purpose.
The metal-free 6.2620.150 Pulsation Dampener is supplied fully assem-
bled and has two connections for capillaries, for which either the con-
830
PC
6.2134.100
6.2134.080/6.2134.090
818
CURRENT
LOOP
RS 232