Six parts from each cleaning stage were analyzed using an Optically Stimulated Electron Emissions instrument(OSEE) from PAT Inc. One reading was made for each sample. An average of the six readings was made.
The values obtained for the new bath were greater than the 2-week old bath. With only two different stages available for testing, not a lot of comparison can be made. Table 1 lists the individual and average readings for the new and 2-week samples.
Table 1 OSEE Readings
Bath Age
OSEE #1
#2
#3
#4
#5
#6
Average
New
1350
1349
1340
1319
1351
1351
1343
2 Weeks
202
191
193
178
210
201
196
Because of the small size of the parts only one reading per sample was recorded (OSEE values decrease the longer a sample is exposed to the ultraviolet light).
Success Rating:
A cleanliness study, addressing only various analytical techniques.
Conclusion:
As of now, limited conclusions can be made due to the number of bath ages to be analyzed. With time, specific relationships may be determined with more data. Next, tests will be conducted on the liquid cleaning bath. Hopefully, readings of the bath characteristics can be related to cleaning efficiency. This will allow the client to determine when the cleaning bath needs to be changed.
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