Metrohm 881 Compact IC pro – Cation - Manual (Page 38)

3.10 High pressure pump
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881 Compact IC pro – Cation
3 Clamping screw 4 Eluent aspiration tubing
Eluent aspiration tubing (6.1834.080) or
(6.1834.090).
5 Backup ring
1 Connecting coupling
Fasten the coupling (15-2) with a pressure screw (15-1) on the pump
head inlet capillary (14-7).
2 Connecting eluent aspiration tubing
Caution
The clamping screws must be tightened carefully. To tighten, grip
the coupling (15-2) with the key (6.2739.000) and grip the clamp-
ing screw (15-3) with the wrench (6.2621.050).
￭ Plug the eluent aspiration tubing (15-4) into the coupling (15-2).
￭ Tighten the clamping screw (15-3).
3.10.2 Deaerating the high pressure pump
The high pressure pump will only operate perfectly if the pump head con-
tains no more air bubbles. Therefore it must be deaerated during initial
start-up and after every change of eluent.
Caution
The high pressure pump must not be deaerated before the initial start-
up .
Deaerate the high pressure pump as follows (see Figure 16, page 31):
Deaerate the high pressure pump
The instrument must be connected to the PC and switched on to deaerate
the high pressure pump.