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Entry  Fri Jul 27 14:28:36 2012, steve, Update, VAC, cold cathode gauges cc_gauges.png
    Reply  Mon Jul 30 15:49:16 2012, steve, Update, VAC, cc1 switched cc1changedfVtH.png
       Reply  Tue Jul 31 08:01:22 2012, steve, Update, VAC, cc1 switched cc1h1d.png
          Reply  Mon Aug 6 10:53:32 2012, steve, Update, VAC, status: vauum normal CCgauges.png
Message ID: 7051     Entry time: Mon Jul 30 15:49:16 2012     In reply to: 7044     Reply to this: 7056
Author: steve 
Type: Update 
Category: VAC 
Subject: cc1 switched 

Quote:

Our cold cathode 423 gauges are 10 years old. They get insulated by age and show no ionization current.  We should replace them at the next vent. I'm buying 4 at $317ea

 

 We have two CC1 gauges at the pump spool. One is in vertical position and the spare is in horizontal. Today I switched the cable from vertical to horizontal CC1

This one is reading higher pressure. It is an old dirty gauge. It may trigger the RGA protection when it's reading goes above 1e-5 torr

The real pressure is 2e-6 torr

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