A system for detecting a liquid, such as liquid water, is provided. The system includes an RFID tag and an absorbent material positioned over the RFID tag. The system also includes features for hindering or preventing compression of the absorbent material and/or for spacing the RFID tag from the absorbent material. A water filter assembly with features for detecting water leaks is also provided.

A system for detecting a liquid, such as liquid water, is provided. The system includes an RFID tag spaced apart from a liquid collection location. The system also includes features for wicking or otherwise transferring liquid from the liquid collection location to the RFID tag. A water filter assembly with features for detecting water leaks is also provided.

A water filter assembly is provided. The water filter assembly includes a filter cartridge removably mounted to a manifold. An RFID tag is positioned at an outer surface of the filter cartridge. The water filter assembly also includes a liquid collector positioned below the filter cartridge. The liquid collector is positioned for receiving liquid leaking from the water filter assembly. A system for detecting liquid is also provided.

A filter cartridge includes a filter medium disposed within an interior volume of a casing. A leak director is positioned on the casing above an RFID tag. The leak director has a trough that extends about a sidewall of the casing. The trough of the leak director has an outlet positioned for directing liquid in the trough to the RFID tag.

In general, techniques are described for filter media monitoring within a filtration system. The filter media monitoring techniques described herein include, for example, direct contact with the filter media, e.g., a sensor may be located inside a boundary defined by a surface of the filter media, or indirect contact with the filter media, e.g., a sensor may be located outside the boundary defined by the surface of the filter media such that the sensor does not make direct physical contact with the filter media being monitored.

The invention relates to a filter cartridge for insertion in a filter housing of a fluid filter, comprising: a filter material configured to filter a fluid flowing therethrough from a raw side to a clean side of the fluid filter during operation of the fluid filter; and a filter-cartridge-side radio module configured to move, during operation of the fluid filter, according to the pressure difference between the raw side and the clean side of the fluid filter, which pressure difference depends on the degree of contamination of the filter material, and to communicate, in order to ascertain the degree of contamination of the filter material, with a housing-side radio module of the fluid filter, the distance (A) of which housing-side radio module from the filter-cartridge-side radio module varies upon movement of the filter-cartridge-side radio module.

In one example, a core cover includes an inner wall that defines a fluid passageway configured to communicate with an interior of a filter core when the core cover is engaged with the filter core. As well, the core cover includes an outer wall spaced apart from the inner wall, and a complementary structure located on the outer wall and configured to engage a corresponding complementary structure of a filter core. Finally, the core cover includes one or more indicia that indicate a flow rate, or range of flow rates, associated with the core cover.

In general, techniques are described for filter media monitoring within a filtration system. The filter media monitoring techniques described herein include, for example, direct contact with the filter media, e.g., a sensor may be located inside a boundary defined by a surface of the filter media, or indirect contact with the filter media, e.g., a sensor may be located outside the boundary defined by the surface of the filter media such that the sensor does not make direct physical contact with the filter media being monitored.

In general, techniques are described for filter media monitoring within a filtration system. The filter media monitoring techniques described herein include, for example, direct contact with the filter media, e.g., a sensor may be located inside a boundary defined by a surface of the filter media, or indirect contact with the filter media, e.g., a sensor may be located outside the boundary defined by the surface of the filter media such that the sensor does not make direct physical contact with the filter media being monitored.

In general, techniques are described for filter media monitoring within a filtration system. The filter media monitoring techniques described herein include, for example, direct contact with the filter media, e.g., a sensor may be located inside a boundary defined by a surface of the filter media, or indirect contact with the filter media, e.g., a sensor may be located outside the boundary defined by the surface of the filter media such that the sensor does not make direct physical contact with the filter media being monitored.