prefilter

prefilter

[prē′fil·tər]
(engineering)
Filter used to remove gross solid contaminants before the liquid stream enters a separator-filter.

prefilter

In air-conditioning systems, a filter, 1 before the main filter to remove the larger particles; usually has a lower efficiency than the main filter and has a low pressure drop characteristic.
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References in periodicals archive ?
It also has enhanced Q1 ion optics with optimised prefilter geometry, which increase ion transmission to reduce contamination and a tapered hexapole collision cell, enabling effective collection and transmission of fragment ions.
HepaSafe technology allows the operator to safely and easily change both the prefilter and the primary HEPA filter while the enclosure remains under negative pressure.
The use of a prefilter on top of an oleophobic filter eliminates blockages commonly found with other protein precipitation plates, especially when handling high protein samples.
Note that this example represents an exact prefilter because the data was filtered using exactly the specified context.
The enclosures include HepaSafe technology, which allows the operator to safely change both the prefilter and the primary HEPA filter while the enclosure remains under negative pressure.
it needs average 296 watts to run each SD filter and 141 watts for each penal prefilter (required for SL filter to ensure its service life).
Various types of prefilters were evaluated initially to find the optimal pore size and the type of material of the prefilter membrane, which effectively removes particles while minimizing bacterial loss.
Most $30 (and up) respirators have a P100 (100 percent efficiency and oil compatible) prefilter and an activated carbon filter for the chemical vapors.
The chosen approach incorporates from the start some measure of generalized bandwidth for the used prefilter so that eventually the link between that generalized bandwidth (the so-called "soft bandwidth") and a critical sampling interval shall be found.
It is engineered to be easily pleated and can be used as the sole efficiency layer in the assembly or in conjunction with a separate prefilter layer.
The company says that this allows the upstream layer to essentially act as prefilter, retaining larger particles, yeast, and colloids, while the tighter downstream layer removes microorganisms and haze components.
This cabinet oven includes two 24" X 24" X 6" thick stainless steel high-temperature HEPA recirculating air filters, plus a 2" prefilter.