JUNE 2007 ISSUE
PALL Marksman
More Surface Area Yields Higher Performance Filtration
Pall, a leader in filtration and separations technology, has developed a new range
of filter elements that combine the performance advantages of cartridge filters
with the ease of use of bag filter systems. MARKSMAN series elements offer a unique
combination of benefits. Filtration customers no longer have to choose between cartridges
and bag technology. Marksman elements are available in three configurations. Marksman
Poly-Fine II filters are constructed of ultra-thin, high performance melt-blown
media. Marksman Poly-Fine XLD series filters are extended life depth filters with
a unique pleated depth configurations. Thicker multi-layered pleat pack combines
the best of pleated and depth technologies. Marksman Nexis A filters deliver all
of the advantages of Pall's "Cold" technology. The unique Co-located Large Diameter
fiber construction produce a fiber matrix with excellent structural integrity assuring
the media does not shift. The proprietary manufacturing process produces a melt
blown depth filter with the most precise removal efficiencies, the greatest consistency
and exceptional void volume for high contaminant holding capacity. Call 1.925.443.9800
to schedule a visit with a knowledgeable RHFS field filtration expert.
Filtration Control
To remove suspended solids for many processes the pre-coat
or diatomaceous earth (DE) filters are used to remove any suspended solids. There
are many processes that require a physical separation of one of more on the components.
It is important to know when any separation process has failed or is not operating
efficiently. This results in the high concentrations of suspended. There need to
be some type of monitor to detect filter failure to minimize downstream contamination.
A continuous filter separates solids by entrapping the suspended material in the
filter medium while allowing the liquid portion to pass. The build-up the trapped
solids will increase the pressure drop across the filter. The Mettler Ingold Forward
Scatter Model 8300/8200 is designed to measure levels of turbidity before and after
the filter. If very low levels are expected or required (0-500 ppm) it is best to
measure the filter product with the Mettler Ingold Forward Scatter Model 8300FS/8400.
Forward scatter is best for extreme low levels of turbidity. Turbidimeters have
also been use to monitor and control the DE addition and dosing. By monitoring the
addition we can assure the proper amount of DE is applied to the filter. This optimizes
DE usage and filter performance. This is done by using the analyzer to detect when
the filtered product is below the required level. The dual benefit is maximum on-line
time and minimum DE usage. .
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