Metrohm 772 Pump Unit - Manual (Page 26)

5.2 Pump tubings
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18 ￭￭￭￭￭￭￭￭
772 Pump Unit
Note
￭ If the tubing is not tightened sufficiently around the rotor, this has a
negative impact on the lifetime of the tubing, as in this case the tub-
ing tends to fold up. If the tubing is tightened too much, the flow is
restricted.
￭ The tubing will last longer if the pressure clamp is detached when
the pump is not in use.
￭ In order to achieve good repeatability of flow rate following a
change in tubing, it is imperative that you always select the same
tubing length.
Before changing tubing:
￭ Pump all of the liquid out of the tubing so that none remains.
￭ Pull out the connection cable of the peristaltic pump to prevent acci-
dental starting of the pump.
￭ Detach the pressure clamp, open the tubing clamps and remove the
tubing.
5.2.5 PharMed® pump tubing data sheet
Physical properties Polypropylene-based thermoplastic elastomer, contains
plasticizer
Dimensions Inner diameter = 6.4 mm
Wall thickness 1.6 mm
Advantages Ideal for aqueous media
Impermeable to normal light and UV radiation
Tubing can be welded, glued and thermoformed.
Very long lifetime
Restrictions Additives can be dissolved out by the pumped medium.
Applications: Acids
Bases
Solvents
Pressure
Vacuum
Viscous media
Sterile media
Good resistance
Good resistance
Not suitable
Well suited
Very well suited
Well suited
Very well suited
Temperature range –60 - +130 °C