Metrohm 872 Extension Module - Manual (Page 39)

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4 Installation
872 Extension Module IC Module
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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 (19-2) with a pressure screw (19-1) on the pump
head input capillary (18-7).
2 Connecting eluent aspiration tubing
Caution
The clamping screws must be tightened carefully. To tighten, grip
the coupling (19-2) with the 6.2739.000 key and grip the clamp-
ing screw (19-3) with the 6.2621.050 wrench.
￭ Plug the eluent aspiration tubing (19-4) into the coupling (19-2).
￭ Tighten clamping screw (19-3).
4.6.2 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 20, page 32):
Deaerating the high pressure pump
The instrument must be connected to the PC and switched on to deaerate
the high pressure pump.