Abstract: A replaceable filter cartridge includes a filter element 24 and an end plate 25 bonded to an end thereof The end plate includes at least two electrical contacts 52, 53 and a key way 67 that includes a relief section 75. Upon proper installation of the filter cartridge into the housing of a filter assembly, a key 41 attached to a centerpost 33 of the housing is received in the relief section of the end plate and the electrical contacts thereof make contact with corresponding electrical contacts in the housing causing a data component 49 to be energized. The data component may include a sensor, data chip, or resistor assembled to an exposed surface of the endplate.

Abstract: A replaceable fluid filter cartridge for a filter assembly which includes a housing and a cooperating centerpost is designed so as to include a generally cylindrical filter element having a sidewall which defines a hollow interior and an endplate bonded to one end of the filter element. The cooperating housing for the replaceable cartridge includes a pair of opposite polarity electrical contacts that are provided at a precise location within the base portion of the housing. A data component which may be a sensor, data chip, resistor, or electrical connection strip is assembled to an exposed surface of the endplate and is arranged with electrical contacts which are constructed and arranged so as to be able to make electrical contact with the housing contacts so long as the replaceable cartridge is properly installed.