Metrohm 872 Extension Module Sample Prep - Manual (Page 21)

￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭ 3 Installation
872 Extension Modul – Sample Prep ￭￭￭￭￭￭￭￭ 13
Only one extension module can be connected directly to the IC instru-
ment. The second extension module must be connected to the first one
and the third has to be connected to the second one.
Connecting extension module to another extension module
1 Plug cable 6.2156.060 or a longer cable 6.2156.070 (optional acces-
sory) into the connector In (6-1) of the second extension module
and screw it tight.
2 Plug the other end of the cable into the Out (6-2) connector of the
first extension module and screw it tight.
3.6.2 Restoring connections to the IC instrument
For more detailed instructions, refer to the manual for the IC instrument.
1 Insert detector again and connect it.
2 Reconnect leak sensor.
3 Reconnect drainage tubings.
4 Restore all cable connections:
￭ USB cable,
￭ MSB cable,
￭ Mains cable.
3.7 Peristaltic pump
3.7.1 Principle of the peristaltic pump
The Peristaltic pump is used for pumping sample and auxiliary solutions. It
can rotate in both directions.
The peristaltic pump pumps liquids according to the principle of displace-
ment. The pump tubing is clamped between the rollers (7-3) and the tub-
ing cartridge (7-5). During operation, the peristaltic pump drive rotates
the roller hub (7-2), so that the rollers (7-3) push the liquid forward in the
pump tubing.