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Watson-Marlow 620DuN and 620Du User Manual 6
finger and sliding it along: fluid is expelled from one end of the tube while more is
drawn in at the other.
Animal digestive tracts function in a similar way.
Suitable applications
Peristaltic pumping is ideal for most fluids, including viscous, shear-sensitive, corro-
sive and abrasive fluids, and those containing suspended solids. They are especial-
ly useful for pumping operations where hygiene is important.
Peristaltic pumps operate on the positive displacement principle. They are particu-
larly suitable for metering, dosing and dispensing applications. Pumps are easy to
install, simple to operate and inexpensive to maintain.
7 Safety notes
In the interests of safety, this pump and the tubing selected should only be used by
competent, suitably trained personnel after they have read and understood this
manual, and considered any hazard involved. If the pump is used in a manner not
specified by Watson-Marlow Limited, the protection provided by the pump may be
impaired.
Any person who is involved in the installation or periodic maintenance of this equip-
ment should be suitably skilled or instructed and supervised using a safe system of
This symbol, used on the pump and in this manual,
means: Caution, risk of electric shock.
This symbol, used on the pump and in this manual,
means: Caution, refer to accompanying documents.
This symbol, used on the pump and in this manual,
means: Do not allow fingers to contact moving parts.
There is a user-replaceable type T5A H
250V fuse in the fuseholder in the centre of
the switchplate at the back of the pump.
The 620N module must be removed, if a 620DuN, to allow
access to the switchplate. See 22.1 620N module removal and
replacement. There are thermal fuses within the pump which
self-reset within 60 seconds; if they trip an error code is dis-
played. This pump contains no user-serviceable fuses or parts.
DuN, Du
This symbol, used on the pump and in this manual,
means: Recycle this product under the terms of the EU
Waste Electrical and Electronic Equipment (WEEE)
Directive.