Now that the new Agilent full-range gauges (FRGs) have been received, I'm putting together an installation plan. Since my last planning note in Sept. (ELOG 15577), two more gauges appear to be malfunctioning: CC2 and PAN. Those are taken into account, as well. Below are the proposed changes for all the sensors in the system.
In summary:
- Four of the FRGs will replace CC1/2/3/4.
- The fifth FRG will replace CCMC if the 15.6 m cable (the longest available) will reach that location.
- P2 and P3 will be moved to replace PTP1 and PAN, as they will be redundant once the new FRGs are installed.
Required hardware:
- 3x CF 2.75" blanks
- 10x CF 2.75" gaskets
- Bolts and nut plates
| Volume |
Sensor Location |
Status |
Proposed Action |
| Main |
P1a |
functioning |
leave |
| Main |
P1b |
local readback only |
leave |
| Main |
CC1 |
dead |
replace with FRG |
| Main |
CCMC |
dead |
replace with FRG* |
| Pumpspool |
PTP1 |
dead |
replace with P2 |
| Pumpspool |
P2 |
functioning |
replace with 2.75" CF blank |
| Pumpspool |
CC2 |
intermittent |
replace with FRG |
| Pumpspool |
PTP2 |
functioning |
leave |
| Pumpspool |
P3 |
functioning |
replace with 2.75" CF blank |
| Pumpspool |
CC3 |
dead |
replace with FRG |
| Pumpspool |
PTP3 |
functioning |
leave |
| Pumpspool |
PRP |
functioning |
leave |
| RGA |
P4 |
functioning |
leave |
| RGA |
CC4 |
dead |
replace with FRG |
| RGA |
IG1 |
dead |
replace with 2.75" CF blank |
| Annuli |
PAN |
intermittent |
replace with P3 |
| Annuli |
PASE |
functioning |
leave |
| Annuli |
PASV |
functioning |
leave |
| Annuli |
PABS |
functioning |
leave |
| Annuli |
PAEV |
functioning |
leave |
| Annuli |
PAEE |
functioning |
leave |
| Quote: |
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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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