Analysis filtration for idendification of cleanliness from components
In the majority of applications, the particles must first be specifically removed from the component with liquid in order to be able to detect them metrologically. This is done either in a extraction cabinet in which a clean room atmosphere is present or in an ultrasonic bath.
The particles ( residual contamination) are collected on an analysis filter and - depending on requirements - characterized by gravimetry, microscopy or elemental analysis.
In the case of filter-based methods, the filtration is formally assigned to the analysis, since the particle retention capacity of the analysis filter in particular helps to determine the limits for detection and thus the analysis result.
The measurement result is highly dependent on the execution of the extraction procedure. Furthermore, the calibration and capabilities of the measuring equipment used determine the result of the cleanliness values to be determined.
The test personnel must carefully execute the procedures and conditions for the analysis. Care must be taken to ensure that the analysis liquid and filters are not additionally contaminated and, on the other hand, that no particles are lost.
The analysis area also plays a major role with regard to the measurement result. For this reason, CleanControlling has developed a dead-space-optimized extraction cabinet that enables the most accurate analyses.