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Fri Aug 22 16:06:29 2008
particle counter replaced, flowbenches & HEPAs checked
MetOne #2 counter was swapped in (on the top of IOC, facing SW direction, at ~75 deg upwards)
with channel one size 0.3 micron and channel two size 1.0 micron.
Sampling time was reduced from 60s to 6 sec at 0.1 cf/min at 25 min rate.
This means that displayed number needs to be multiplied by x100 to get particles/cf/min
HEPA filters and flow benches were checked:
PSL enclosure closed, HEPA speed at 60% 0-0 particles on optical table NW corner
AP covered optical table 1,000 particles of 0.3micron and 10 of 1.0 micron at NE corner
Flow bench at SE 0-0 particle (p)
on the top of SP cover at SE corner 60,000 p of 0.3 micron and 530 p of 1.0 micron
Mobile HEPAs 10cm from output screen in the center 800 p of 0.3 micron and 0 p of 1 micron
These filters will be replaced.
Clean assembly room:
both flow benches 0-0 p for 0.3-1.0 micron
east side bench 520 p of 0.3 micron and 210 p of 1.0 micron
Large hood in baking room with fan on 1.7 million p of 0.3 micron
and 16,000 p of 1.0 micron
Pasadena air just outside of main entrance:
3 million p of 0.3 micron and 30,000 p of 1.0 micron
My desk 743,000 p of 0.3micron, 63,000 p of 0.5 micron and 5,500 p of 1.0 micron cf/min
NOTE: existing COCHECKLIST.adl PEM displays needs to be corrected so it shows the 10 fold increase
and change particle size on this screen to 0.3 micron