Frequently asked questions

Is a Witness plate the same as a Partikelfalle?

Yes it is. In the englisch language we talk about the plate showing the evidence of the deposition. In the german language it is called the trap for particles. Often is the “trap” even equiped with a door.¬† The dimensional set-up does not ensure low airflow levels when handling, therefore fibres may be lost.


What is the main differnce between an APMON and a PDM?

The APMON makes use of a cartridge  for the collection of particles and the PDM of a Witness plate being just a glass disk. The cartridge may not become detached from the measuring unit during the measureing.  Witness plates can be used to collect dust even without measurement equipment being around.