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. |