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 like the exposure boxes. The dimensional set-up does ensure low airflow levels when handling, therefore fibres cought remain on the disk. The use of the exposure box has the advantage that samples can be safely transported over short distances to the measurement equipment.
Some companies prefer to go with the PDM equipment to the sampling points. In order to facilitate this a rechargeable battery device is offered to use with the PDM. On a laboratory trolley the PDM, laptop and battery pack can be easily transported.