Filtering Technology

On this page, you will find all information and instruments relating to the subject of filtering technology. Filtering technology covers two fields. The first field, the filtration, includes instruments and solutions for the accomplishment of the filtering process. The second field, the filtrate-test, deals with instruments, which are needed for the filtrate test. Filtration is a mechanical separating process, whose task it is to remove (filter) particles and floating particles out of fluid or gaseous mediums (suspension or aerosol). For this purpose, there is great number of diverse procedures and instruments. Examples for various filtering methods are the Cross-Over-Filtration, the layer-filtration and the surface-filtration. When filtering technology is used, one often needs to test the filtrate after the filtration (e.g. when deleting toxic particles). In this case, the filtrate-test comes into operation. Among the instruments that are applied in the filtrate-test, there are moisture-detectors, muffle furnaces, dry boxes, incinerators and scales. You will soon find an assortment of instruments from the filtering technology on this page. You can receive more information on new products and monthly offers via e-mail here. If you can't find the filtering technology you are looking for, please contact us and we will help you find the best solution which suits your needs: UK customers +44(0) 23 809 870 30 / US customers (561) 320-9162. Our technical staff will advise you regarding our products. Our engineers and technicians will be happy to help you with the filtering technology, and of course, with the other products in the field of regulation and control, measuring instruments or scales and balances of PCE Instruments Ltd.

Cross-Flow-Filtration: In Cross-Flow-Filtration, the liquid which is supposed to be filtered flows along a filter medium at a velocity of 3 m/sec. The high flow rate is necessary to avoid the formation of a filter cake. This would increase the resistance to filtration and thus lead to a higher energetic expenditure. Since this process does not arouse a filter cake, the suspension has to be pumped down when a certain combination of solids is reached. This filtering technique is often used in the filtration of beverages.
Layer-filtration: During layer-filtration, filter plates of a size of 4-5 mm are composed in several layers. With this filtering technique, the medium to be filtered is filtered more finely from layer to layer and thereby, a very high degree of filtration is achieved. This filtering technique is important in the filtration of spirituous beverages.
Surface-filtration: Surface-filtration consists of cylindrical filter tubes. These tubes are positioned in numerous lines next to each other and stabilized with the help of a supporting cage. The gas flow passes through the tubes from the outside inwards. Gradually, a filter cake is built on the surface of the tubes. With increasing thickness, this filter cake operates as an effective filter itself. With the rise of the filter cake, the differential pressure rises, too. This leads to a higher energy consumption and requires a regular cleaning of the filter. This filtering technique finds application in cases in which a gas flow has to be cleaned up because of particles, e.g. in cement plants or mills. Here, the flour is recaptured from the gas flow by aid of the surface-filter.