Quality control and development of flat media at 120 nm

Fig. 1: MFP 1000

Corresponding test aerosols are generated using various selectable aerosol generators (1). Optionally, aerosol neutralization follows using the CD 2000 discharge system (2).

The aerosol and mixed air feed is pressure-operated on the upstream side. Mass flow controllers precisely control the required air volume flows on the inlet side. Data such as volume flow and differential pressure at the filter are automatically recorded. The aerosol is homogeneously mixed in the test channel.

Aerosol extraction for particle measurement is representative, taking isokinetic into account. The measuring device used is the Promo^® 1000, which covers particle sizes from 0.12 - 40 µm. (4)

Here, the unambiguous particle measurement, also in high concentrations of up to 5 - 10⁵ particles/cm³ (SAE-Fine), is carried out with integrated Windows test rig software.

The next step is the clean gas measurement. The filter material is inserted in the test channel. The filter holder can be easily opened pneumatically. (3)

Individual adapters also allow the testing of small filter elements of different designs. The pressure drop, the clean gas concentration, and the clean gas aerosol's size are determined, and the fractional efficiency is calculated. In the case of loading measurement, the fractional collection efficiency is decided until the loading time has elapsed or the final pressure drop has been reached.

The integrated FTControl software controls the system automatically. Individual sequence programs ensure that the measurements are carried out reliably.

The strictly vertical design of the test system with only one sampling probe ensures precise measurement even of large particles up to 40 µm, as sedimentation losses are excluded. This enables reliable separation efficiency determination over the entire measuring range for all particle sizes.

Extensions/Accessories

Aerosol generation

Thanks to the modular design, various test aerosols can be generated, depending on the aerosol generator used: DEHS, oils, kerosene oil, NaCl or KCl, and test dust such as ISO A2 Fine.

Aerosol discharge

Depending on the application, the aerosol is discharged via the electrical corona discharge CD 2000 or the X-ray source XRC 049, which is not subject to approval.