40m QIL Cryo_Lab CTN SUS_Lab TCS_Lab OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop
  40m Log  Not logged in ELOG logo
Entry  Wed Nov 7 11:43:29 2012, Steve, Update, PEM, high particle count ALART highpartcount.png
    Reply  Wed Nov 7 14:59:35 2012, Steve, Update, PEM, high particle count ALART & oplevs oplevs.png
       Reply  Tue Feb 5 10:18:54 2013, Steve, Update, PEM, high particle count ALART badair.png100d_airq.png
          Reply  Thu Jun 27 15:58:27 2013, Steve, Update, PEM, PSL enclosure particle counts 
Message ID: 8765     Entry time: Thu Jun 27 15:58:27 2013     In reply to: 8001
Author: Steve 
Type: Update 
Category: PEM 
Subject: PSL enclosure particle counts 


 Particle counts were measured inside the PSL enclosure at 40VAC variac setting.

Directly under HEPAs, on the east half of the optical table : 0.3 micron    20  particles / cu ft,       0.5 micron     0  p / cu ft,      0.7 micron        0 p / cu /ft

Away from the HEPAs, on the west edge of the op table:     0.3 micron   960  particles / cu ft,      0.5 micron    50 p / cu ft,       0.7 micron      20 p / cu ft

We may want to increase the RPM a little bit.


Checked our counters against recently calibrated Met One GT-526:

#1 is right on, #2 measured 25% less (it will go for calibration)


Flow bench at the south end :   zero particle for all 3 sizes


IOO chamber particle logging  measures  0.5 and 1 micron.  Chamber opening limit is set to 10,000 particles max of 0.5 micron

At 10,000 p of 0.5 micron means ~100,000 - 180,000 p of 0.3 micron

We may have to lower the limit.

ELOG V3.1.3-