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Entry  Thu Jun 19 17:11:52 2014, steve, Update, PEM, it is warmer today warmertoday.png
    Reply  Mon Sep 22 10:18:58 2014, steve, Update, PEM, lab temperatures summerheat.png
       Reply  Tue Nov 4 10:40:46 2014, steve, Update, PEM, lab temperatures and particle counts PEM100d.png
          Reply  Mon Dec 8 09:03:49 2014, steve, Update, PEM, air cond maintenance tomorrow morning 
             Reply  Wed Dec 10 14:26:13 2014, steve, Update, PEM, air cond maintenance and particle plot 05.png
                Reply  Fri Sep 16 14:15:28 2016, steve, Update, PEM, partical counts 80days.png
                   Reply  Fri Dec 2 10:57:08 2016, steve, Update, PEM, door seal replaced 1_year_PEM.png
                   Reply  Fri Feb 17 10:56:12 2017, steve, Update, PEM, particle counter moved into PSL enclousure from_here.jpgto_here.jpgPSL_particles.png
                      Reply  Tue Feb 21 10:08:35 2017, steve, Update, PEM, noisy morning outside_activity.png
                      Reply  Wed Feb 22 08:54:17 2017, steve, Update, PEM, PSL enclousure particle count dusty__PSL.png
                         Reply  Tue Feb 28 08:04:48 2017, steve, Update, PEM, ETMX damping recovered ETMX.png
                            Reply  Tue Feb 28 18:25:22 2017, rana, Update, PEM, ETMX damping recovered 
                               Reply  Thu Mar 16 08:22:16 2017, Steve, Update, SUS, ETMX damping  laser_power_glitch.png
                            Reply  Mon Aug 28 10:51:21 2017, steve, Update, SUS, ETMX damping recovered ETMX_restored.png
                      Reply  Mon Mar 20 17:12:08 2017, steve, Update, PEM, particle counter inside of PSL enclousure enclousure_partical_count.png
                         Reply  Mon Mar 27 15:36:27 2017, Steve, Update, PEM, particle counter inside of PSL enclousure HEPA_flow_effects.png
Message ID: 12498     Entry time: Fri Sep 16 14:15:28 2016     In reply to: 10773     Reply to this: 12656   12836
Author: steve 
Type: Update 
Category: PEM 
Subject: partical counts 

South end flow bench and both clean room assembly flow benches measured zero counts for 0.3 and 0.5 micron size particales.

The counting efficiency of 0.5 micron is 100%

 

  location

 

 

        0.3 micron particles / cf min

 

 

      0.5 micron particles / cf min

 

 

 counter

 MET

 ONE

 

        effect
 ITMY table  35,000  3,000   #3  
 ETMY table  35,000  3,000   #3  
 ITMX table  24,000  2,400   #3  PSL HEPA at 50V
 ITMX wall mounted  -  2,500   #1  
 ETMX work bench    5,000     600   #3   flow bench on  

 

The PSL HEPA performance was measured at the center of the table with MET ONE #3

 Voltage Variac particles /cf min   particles /cf min
 particle size  0.3 micron  0.5 micron
 60  0  0
 50  10  0
 40  1,400  110
 20  1,400  100
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