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Entry  Wed Sep 16 12:03:07 2020, Jon, Update, VAC, Replacing pressure gauges vac_gauges.png
    Reply  Wed Dec 2 12:27:49 2020, Jon, Update, VAC, Replacing pressure gauges 
       Reply  Thu Dec 3 14:53:58 2020, Jon, Update, VAC, Replacing pressure gauges 
Message ID: 15577     Entry time: Wed Sep 16 12:03:07 2020     Reply to this: 15692
Author: Jon 
Type: Update 
Category: VAC 
Subject: Replacing pressure gauges 

Assembled is the list of dead pressure gauges. Their locations are also circled in Attachment 1.

Gauge Type Location
CC1 Cold cathode Main volume
CC3 Cold cathode Pumpspool 
CC4 Cold cathode RGA chamber
CCMC Cold cathode IMC beamline near MC2
P1b Pirani Main volume
PTP1 Pirani TP1 foreline

For replacements, I recommend we consider the Agilent FRG-700 Pirani Inverted Magnetron Gauge. It uses dual sensing techniques to cover a broad pressure range from 3e-9 torr to atmosphere in a single unit. Although these are more expensive, I think we would net save money by not having to purchase two separate gauges (Pirani + hot/cold cathode) for each location. It would also simplify the digital controls and interlocking to have a streamlined set of pressure readbacks.

For controllers, there are two options with either serial RS232/485 or Ethernet outputs. We probably want the Agilent XGS-600, as it can handle all the gauges in our system (up to 12) in a single controller and no new software development is needed to interface it with the slow controls.

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