Recommendations
• To ensure that consistent and accurate flow rates are
maintained, systematically replace peristaltic tubing as soon as
it appears to be worn. You can reduce wear on the tubing by
running at slower speeds, by using tubing of a larger diameter,
or by loosening the adjustment screws. Conversely, you should
tighten the adjustment screws to reduce the level of pulsations,
which may also be reduced by applying some back pressure, or
by selecting a more rigid tubing material, like PVC.
• When the pump is not in use, release the compression cams by
pressing on the bevelled corners of the trigger key and slacken
the tubing. This increases the life of the tubing.
• A small piece of Iso-Versinic® tubing is supplied in the standard
accessory package. Fit one piece to the pump head by pushing
it onto the drain. The purpose of the drain is to remove liquid
from the pumphead if the flow tubing breaks; it limits the risk of
liquid seeping into the speed control module, which contains the
motor and electronic circuitry.
• To prevent liquid from leaking in the event of a tube breaking,
install the pump at a higher level than the tank and collector.
This arrangement eliminates gravitational flow.
• If the pump is used as part of a system where a back pressure is
present (for example, against a chromatographic column), the
adjustment screw must be tightened by one or two extra turns
to enable the liquid to flow. Where back pressure is present,
the maximum flow rates are less than the values that can be
measured from the charts, which are plots of values measured
at atmospheric pressure (refer to Flow Rate Selection and
Adjustment on page 33). Use the RABBIT key to prime the
tubing (fill it with liquid); see Chapter 3 | Operation.
37
MINIPULS® 3 PERISTALTIC PUMP | USER'S GUIDE
SAFETY COVER INSTALLATION
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