Metrohm 844 UV/VIS Compact IC - Manual (Page 41)

2.6 High-pressure pump
844 UV/VIS Compact IC / Gebrauchsanweisung 8.844.1051
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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
transport the pump head is fitted with three transport security screws
19. 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 27/54.
In order to avoid damage to the pump head these three security
screws should be attached to the pump head each time that the 844
UV/VIS Compact IC is to be transported.
2.6.2 Installing the pulsation dampener
With the PEEK versions 2.844.0010, 2.844.0020, 2.844.0110 and
2.844.0120, the 6.2620.150 Pulsation dampener MF has to be
installed between the high-pressure pump and the injection valve of the
844 UV/VIS Compact IC, to protect the column material against
pressure drops caused by the injection valve. Proceed as follows:
1 Install pulsation dampener
• Position the pulsation dampener 36 in the interior of the Com-
pact IC on the base.
2 Connection to the pump
• Unscrew PEEK capillary 35 of coupling and attach it to
connection 80 of the pulsation dampener 36.
3 Connection to injection valve
• Unscrew PEEK capillary 38 of coupling and attach it to
connection 81 of the pulsation dampener 36.
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
directions.
The two steel versions 2.844.0030 and 2.844.0130 are operated
without Pulsation dampener.