VALIDATION AND ACCEPTANCE OF CLEANROOMS

In this test, the absence of leakage in the installed filter is checked by testing it with a reference aerosol (e.g. DEHS, Emery). The filter test is carried out in the cleanroom in the installed state using the same methods (aerosol generation, dilution, and measurement) and basic principles as during filter manufacture. For the filter integrity test, the measurement set for the acceptance of cleanroom systems is suitable, containing the components ATM 228 arosol generator, DIL 554 dilution system, LAP 340 particle counter, SYS 529 sampling probe and the CRQWin cleanroom qualification software. The combination of these components can be used, among other things, to find filter leaks in cleanroom systems. Reliable acceptance is only possible if there is a sufficiently high particle concentration on the upstream side. Since cleanroom particle counters cannot measure these high particle concentrations, the test aerosol is diluted by a defined factor using a dilution system. This makes it possible to determine the upstream and downstream gas concentration with only one measuring device, for example with the LAP 340 particle counter. With the SYS 529 rectangular sampling probe, the filters can be scanned up to the corners on the clean gas side.

In order to remove potential particle contamination quickly, the air exchange rate in cleanrooms must always be sufficiently high. During recovery time measurement, test aerosols are introduced into the room. The decay curve of the particle concentration and thus the recovery time of the room to the original concentration level is then measured. With this Topas proprietary technology, you will be successful in your recovery time measurements: ATM 228 aerosol generator, LAP 340 cleanroom particle counter, CRQWin cleanroom qualification software.

Flow visualisation devices such as the CFG 291 fog generator, successor model to the popular CFG 290, make laminar or turbulent flow conditions visible in cleanroom areas and thus also detect areas with insufficient air exchange, in which particles can concentrate. Flow visualisations are therefore absolutely necessary before commissioning a cleanroom. But even if modifications are made to the cleanroom or components are adjusted to new production processes, it must be demonstrated that these do not adversely affect the flows. Topas cleanroom equipment not only complies with the standards and directives, but also offers the user state-of-the-art technology as well as sensible design and optimised handling. For us, this includes, for example, the suitability of the test equipment for mobile use as well as the use of residue-free, non-toxic mist when inspecting cleanrooms by air flow visualisation.