Operation And Maintenance; Servicing The Door; Peristaltic Pump; Notes On Operating The Peristaltic Pump - Metrohm 942 Extension Module Vario LQH Manual

5.1 Servicing the door

5 Operation and maintenance

5.1 Servicing the door
5.2

Peristaltic pump

5.2.1

Notes on operating the peristaltic pump

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CAUTION
The door is made of PMMA (poly(methyl methacrylate)). It must never
be cleaned with abrasive media or solvents.
CAUTION
Never hold the instrument by the door when lifting it. Only hold the
instrument by the housing.
The flow rate of the peristaltic pump depends on the drive speed (set
using the software), the contact pressure and, above all, the inner diame-
ter of the pump tubing. Depending on the application, different pump
tubing is used. Select pump tubing that best matches your application (see
table 1, page 18).
CAUTION
The service life of the pump tubing primarily depends on the contact
pressure.
If the peristaltic pump is switched off for long periods, lift up the tubing
cartridges on the right side by releasing the snap-action levers. This
ensures that the contact pressure will be maintained once it has been
set.
CAUTION
The pump tubing (6.1826.xxx) is made of PVC or PP and therefore must
not be used for rinsing with solutions containing organic solvents. In
this case, use different pump tubing or use another pump for rinsing.
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942 Extension Module Vario LQH (2.942.0070)