Metrohm 790 Personal IC - Manual (Page 34)

2.6 High-pressure pump
790 Personal IC
25
2.6 High-pressure pump
In order to avoid damage to the pump it must never be operated dry.
Each time that the pump is switched on always first check that the
eluent supply has been connected up correctly and that sufficient
eluent is present in the eluent bottle.
2.6.1 Removing the transport security screws
In order to prevent the pump drive from being damaged during trans-
port the pump head is fitted with three transport security screws 10 10 10 10 (see
Fig. 2). These transport security screws must be removed before the
high-pressure pump is started up. Also remove the red sticker attached
to the pump head 34 34 34 34.
In order to avoid damage to the pump head these three security
screws should be attached to the pump head each time that it is to
be transported.
2.6.2 Installing the pulsation dampener (option)
To protect the column material of sensitive separating columns (e.g.
methacrylate-based columns) against pressure drops caused by the in-
jector, the use of the optional 6.2620.150 Pulsation dampener MF is
recommended. It has to be installed between the high-pressure pump
and the injection valve of the 790 Personal IC as follows (see Fig. 10):
1 Install pulsation dampener
• Position the pulsation dampener 52 52 52 52 in the interior of the 790
Personal IC on the base.
2 Connection to the pump
• Unscrew PEEK capillary 27 27 27 27 of coupling 26 26 26 26 and attach it to
connection 54 54 54 54 of the pulsation dampener 52 52 52 52.
3 Connection to injection valve
• Unscrew PEEK capillary 18 18 18 18 of coupling 26 26 26 26 and attach it to
connection 53 53 53 53 of the pulsation dampener 52 52 52 52.
The pulsation dampener is filled with isopropanol and must be rinsed
with eluent before connection to a separating column (see section
2.6.4).
The 6.2620.150 Pulsation dampener can be operated in both direc-
tions.