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Entry  Tue Jul 17 12:55:45 2018, Koji, Summary, General, Started pumping 6x
    Reply  Tue Jul 17 18:16:38 2018, Steve, Summary, VAC, pumpdown 81 at 6 hrs 6x
       Reply  Tue Jul 17 22:25:41 2018, Koji, Summary, VAC, pumpdown 81 at 6 hrs 
          Reply  Wed Jul 18 12:49:08 2018, Steve, Summary, VAC, pumpdown 81 at 6 +4.5hrs manlGateScan.pnghanding_over_Mag.pngTGVw2auxfans_.jpg
             Reply  Wed Jul 18 17:36:50 2018, Steve, Summary, VAC, pumpdown 81 at 6 +9 hrs completed pd81completed.pngpd81@30hrs.png
                Reply  Thu Jul 19 01:56:25 2018, gautam, Summary, VAC, AUX pump shutdown 
                   Reply  Thu Jul 19 11:01:03 2018, Steve, Summary, VAC, pd81 @ 2e-5 Torr pd81@2days.png
                      Reply  Thu Jul 19 13:35:30 2018, Steve, Summary, VAC, annuloses pumped  AnsPumped.png
                         Reply  Mon Jul 23 09:58:52 2018, Steve, Summary, VAC, RGA scan at day 6 pd81-560Hz-d6.png
                            Reply  Mon Aug 6 09:34:02 2018, Steve, Update, VAC, RGA scan at day 20 pd81d20.png
                               Reply  Thu Aug 16 07:50:28 2018, Steve, Update, VAC, pumpdown 81 at day 30 pd81d30.png
                                  Reply  Thu Aug 16 14:48:14 2018, Steve, Update, VAC, why do we need a root pump? 6x
                                     Reply  Fri Nov 16 10:26:12 2018, Steve, Update, VAC, single viton O-rings Single-O-ring.png
                                  Reply  Fri Aug 24 10:51:23 2018, Steve, Update, VAC, pumpdown 81 at day 38 d38.png
                                     Reply  Thu Oct 4 08:25:50 2018, Steve, Update, VAC, rga scan pd81 at day 78 pd81d78.png
                                        Reply  Fri Oct 12 08:27:05 2018, Steve, Update, VAC, drypump forepump.png
                                           Reply  Fri Oct 12 17:37:03 2018, Steve, Update, VAC, pressure gauge choices  
                                           Reply  Mon Oct 15 13:59:42 2018, Steve, Update, VAC, drypump replaced drypump_swap.png
                                        Reply  Tue Nov 13 16:15:01 2018, Steve, Update, VAC, rga scan pd81 at day 119 pd81-d119.pngpd81-560Hz-d119.png
Message ID: 14247     Entry time: Fri Oct 12 17:37:03 2018     In reply to: 14244
Author: Steve 
Type: Update 
Category: VAC 
Subject: pressure gauge choices  

We want to measure the pressure gradient in the 40m IFO

Our old MKS cold cathodes are out of order. The existing working gauge at the pumpspool is InstruTech CCM501

The plan is to purchase 3 new gauges for ETMY, BS and MC2 location.

Basic cold cathode     or    Bayard-Alpert Pirani

    

 

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