But mostly the things you do on inlet filter is a performance test (DOP/EMERY) and you set up a schedule to replace it regularly.
If over the filter an deltaP measuring is set that will sound an alarm when the pressure drop gets to high, be sure that the dP value you put pre-set is conform the dP prescribed by the vendor of the filter.
Anyways the more imporatnt filters in such a systel are exhaust (final) filters which bring the air over your product (stoppers).
Is this a clear enough answer? if not skecth a bit your equipment setup.