I have been using Liquiports in our laboratory for quite some
time now, and have also been involved in the development of the new SIMDOS dosing
pump. These pumps are based on the diaphragm technology and give me some advantages
which I would like to describe.
Because the diaphragm pumps are available with
a PTFE diaphragm and a variety of head materials, they have a very high level
chemical resistance and thus can handle a wide range of chemicals. This allows
me more flexibility than with a peristaltic pump.
Further advantages when compared with a peristaltic
pump are the favorable pulsation characteristics and the clearly higher operating
pressure capability. On inspection of the maintenance intervals, it becomes
clear that these are much longer for a diaphragm pump than the recommended lifetimes
of the tubes for a peristaltic pump.
In general, the bearings of many peristaltic
pumps are not fully enclosed, making them susceptible to corrosion. As is often
the case, the tubes break and contaminate the bearings. This leads to premature
bearing failure, an expensive repair. In the case of the diaphragm pumps, only
the liquid can come into contact with the head parts.
Finally, peristaltic pumps which cover the same flow range, are
much bigger and heavier than the equivalent diaphragm pump.
Sanofi Aventis - Frankfurt
Alexander is pictured holding a KNF SIMDOS 10 liquid transfer/dosing