Metrohm 843 Pump Station with peristaltic pump - Manual (Page 30)

5.3 Tubings ￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭
22 ￭￭￭￭￭￭￭￭ 843 Pump Station with Peristaltic Pumps
5.3 Tubings
5.3.1 Safety instructions
Because of the fact that the pump is subject to wear, it must be replaced on
a regular basis. Worn-out, defective pump tubing represents a safety risk,
particularly when aggressive liquids are being conveyed.
Note
Check the pump tubing regularly for cracking, leaks or the intake of air
Use separate pump tubings for different liquids. Dispose of used tubing
without delay.
5.3.2 Selection of pump tubings
The most important decision when using peristaltic pumps is the selection
of suitable tubing material. Always use tubings particularly intended for per-
istaltic pumps.
The peristaltic pump of the Pump Station is supplied with a PharMed® pump
tubing (Order no. 6.1826.100; 6,4/9,5 mm
⌀ made of thermoplastic poly-
propylene). It is especially suitable for aqueous media.
For the transport of non-aqueous solutions, we recommend a Viton pump
tubing (Order no. 6.1826.160).
If you need other tubings for your application, take care of the following
points when evaluating the pump tubings:
￭ Chemical resistance
￭ Pressure build-up in the pump tubing
￭ Sterilizability
￭ Temperature of the pump medium and the environment
￭ Viscosity of the liquid
￭ Permeability of the pump tubing
￭ Demanded delivery rate
￭ Tubing dimensions
5.3.3 Tubing replacement and service life
Pump tubings have a limited service life and must therefore be replaced at
regular intervals. Factors which could influence the service life of tubings in
the peristaltic pump include:
￭ Pumping speed (rolling effect/min)
￭ Properties of the liquid being conveyed
￭ Initial pressure
￭ Ambient temperature