Able Planet 620DuN 5 Information for returning pumps, 6 Peristaltic pumps

Watson-Marlow 620DuN and 620Du User Manual 5

up, voltage selection and fuse inspection and then re-affixed before the pump

is operated.

The designated mains power lead for your pump

PC-readable CDROM containing these operating instructions

Quick Start manual

Note: Some versions of this product will include components different from those

listed above. Check against your purchase order.

This product has an extended shelf life. However, care should be taken after storage

to ensure that all parts function correctly. Users should be aware that the pump con-

tains a battery with an unused life of seven years. Long-term storage is not recom-

mended for peristaltic pump tubing. Please observe the storage recommendations

and use-by dates which apply to tubing you may wish to bring into service after stor-

age.

5 Information for returning pumps

Equipment which has been contaminated with, or exposed to, body fluids, toxic

chemicals or any other substance hazardous to health must be decontaminated

before it is returned to Watson-Marlow or its distributor.

A certificate included at the rear of these operating instructions, or signed state-

ment, must be attached to the outside of the shipping carton. This certificate is

required even if the pump is unused.

If the pump has been used, the fluids that have been in contact with the pump and

the cleaning procedure must be specified along with a statement that the equipment

has been decontaminated.

6 Peristaltic pumps - an overview

Peristaltic pumps are the simplest pump, with no valves, seals or glands to clog or

corrode. The fluid contacts only the bore of a tube, eliminating the risk of the pump

contaminating the fluid, or the fluid contaminating the pump. Peristaltic pumps can

run dry.

A compressible tube is squeezed between a roller and a track on an arc of a circle,

creating a seal at the point of contact. As the roller advances along the tube, the

seal also advances. After the roller has passed, the tube returns to its original shape,

creating a partial vacuum which is filled by fluid drawn from the inlet port.

Before the roller reaches the end of the track, a second roller compresses the tube

at the start of the track, isolating a packet of fluid between the compression points.

As the first roller leaves the track, the second continues to advance, expelling the

packet of fluid through the pump’s discharge port. At the same time, a new partial

vacuum is created behind the second roller into which more fluid is drawn from the

inlet port.

Backflow and siphoning do not occur, and the pump effectively seals the tube when

it is inactive. No valves are needed.

The principle may be demonstrated by squeezing a soft tube between thumb and

DuN, Du