Filter comprises particle load detector providing continual indication of filter condition in safety-critical applications without interruption to filter operation

摘要

The filter assembly has a particle filter and/or an adsorption filter. The filter assembly incorporates a mechanical resonator (18), which may be formed by a piezo-ceramic resonator (20) or a flexural resonator. The mechanical resonator is charged with a given quantity of the particle and/or adsorbent filter medium (34).