CPC B01D 29/96 (2013.01) [B01D 29/23 (2013.01); B01D 35/147 (2013.01); B01D 2201/295 (2013.01); B01D 2201/4053 (2013.01); B01D 2201/52 (2013.01)] | 15 Claims |
1. A filter device, comprising:
a filter housing having at least two housing key parts, a holder interchangeably attached to the filter housing and a cover plate closing an open end of the filter housing;
a filter element being received in the filter housing and having at least two element key parts that mate with the housing key parts to provide at least one of a coding, a fixing, an operation or protect against unlicensed filter element copies, the element key parts being arranged on an annulus mounted on an end cap of the filter element, the holder of the filter housing having an inner contour conforming to and receiving the annulus; and
a seal on a free end face of the annulus engaging the cover part and sealing an interior of the filter housing from an environment surrounding an exterior of the filter housing.
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