Metrohm 761 Compact IC - Manual (Page 35)

2.6 High-pressure pump
761 Compact 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 18 (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.
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
To protect the column material against pressure drops caused by the
injector, the 6.2620.150 Pulsation dampener MF has to be installed
between the high-pressure pump and the injection valve of the 761
Compact IC. Proceed as follows (see Fig. 10):
1 Install pulsation dampener
• Position the pulsation dampener 60 in the interior of the 761
Compact IC on the base.
2 Connection to the pump
• Unscrew PEEK capillary 35 of coupling 33 and attach it to
connection 62 of the pulsation dampener 60.
3 Connection to injection valve
• Unscrew PEEK capillary 26 of coupling 33 and attach it to
connection 61 of the pulsation dampener 60.
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.