Upload
phungthuan
View
222
Download
0
Embed Size (px)
Citation preview
Applications30
WORLD PUMPS September 2013
www.worldpumps.com
Multi-diaphragm seal-
less pumps for HPLC
Chemical handling
The company saw that the Hydra-Cell concept
is based on a combination of features relevant
to the demands of HPLC but not off ered in
alternative pump designs. Multiple hydrauli-
cally-balanced diaphragms, operating stress-
free throughout the pump’s wide pressure
range, are incorporated in a single head; they
fl ex in sequence to provide the pumping
action, giving virtually pulse-free fl ow. This
arrangement also reduces physical bulk, weight
and footprint and can help reduce overall
system cost.
With no dynamic seals or packings in the pump,
there is no seal wear, avoiding consequential
leaks and sustaining performance at a
consistent level. Other distinctive features
include Wanner’s Kel-Cell diaphragm position
control system which protects the diaphragms
under abnormal inlet conditions, allowing the
pump to run dry indefi nitely without damage.
Two Hydra-Cell models are off ered as standard
equipment in Separlab HPCL systems: the G03
(max fl ow 11.3 l/min at 70 bar) and the G10 (up
to 29 l/min at the same pressure). G10 pumps
are also employed on mobile phase delivery,
with further expansion of the Separlab product
range. Their higher fl ow is needed for columns
of more than 500mm ID.
The company’s high-pressure industrial-scale
separation units are usually built to bespoke
design. The schematic (Figure 1) shows a typical
installed system with Hydra-Cell G10 and G03
pumps.
www.hydra-cell.eu
www.separlab.eu
Separlab Ltd., a Czech Republic specialist
in high-performance liquid chromatog-
raphy (HPLC), has standardised on Wanner
seal-less Hydra-Cell multi-diaphragm pumps
in its industrial-scale systems, using them for
delivering ‘mobile phase’ solvents and injecting
sample mixtures. Hydra-Cell has been preferred
to single-diaphragm and piston-plunger
pumps on these applications.
The Prague-based company processes, designs,
builds and supplies individual products and
complete systems for home and export. It
serves two main market sectors: laboratories
and production plants. In both these areas it
concentrates on preparative and process chro-
matography, rather than analytical. A common
application is purifi cation of a compound in
suffi cient volume for further work, for example
quantitative analysis or use in a process.
Pump specification and performance can
be critical factors in this process. Alongside
high-pressure pumping capability, essential
features include corrosion resistance, a pump’s
ability to produce precise fl ow with no pulsa-
tion and consistency. For HPLC on a larger
industrial scale fl ow rates are higher, but fl ow
must still be pulse-free. Pressure requirements
remain high, while ease and accuracy of pump
control, reliability and easy maintenance are
also important. It was to match and reconcile
these potentially confl icting needs that Sepa-
rlab turned to Hydra-Cell pumps.
Hydra-Cell multi-diaphragm pumps have become the preferred option for Separlab Ltd., a Czech
Republic specialist in high-performance liquid chromatography (HPLC). The company is using
them for delivering ‘mobile phase’ solvents and injecting sample mixture. The company saw that
the Hydra-Cell concept is based on a combination of features relevant to the demands of HPLC
but not off ered in alternative pump designs.
Figure 1. Typical Separlab system for industrial preparatory chromatography
WOPU0813_App_HydraCell 30 31-07-13 10:30:43