Criteria for assessment and evaluation of cleaning results

There are a number of different processes that can be customized to monitor the cleaning process and cleaning results. Depending upon the existing requirements, simple qualitative tests can be applied to produce a Good or Poor rating, or more elaborate quantita- 

An optical method by which a change of the refractive index of liquids, depending upon the content of liquid or solid contaminants, is used to measure the level of bath contamination. 

This method establishes the non-volatile residues in cleaning and rinsing baths. This produces a very accurate statement of the bath contamination level. 

The electrochemical potential is determined by the pH value, which furnishes an indirect statement of the level of contamination. 

This is used to check the quality of the rinsing bath in assembly cleaning processes. The conductivity measurement indicates the amount of process-related ionic, and therefore conductive, contaminants carried over into the rinse medium. 

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