During yesterday's maintenance period, we removed the Inficon BCG450-SE pressure gauge that was on the C1 cross in the FC. This gauge has not been in use since the inital pumpdown of the filter cavity tube and was used in conjunction with the SS500 pump cart.

The +X RAV was closed, along with the redundant RAV before the inficon gauge. Gauge volume was vented and replaced with an o-ring angle vavle and KF40 to CF adapter. Newly install joints were pumped down and leak tested with HLD, and showed no He signal above the leak detector background, <1E-11 Torr-l/s. After leak check was complete, the +X RAV was opened to the main FC volume, redundant RAV remains closed as a pump-out port.

This gauge is now a spare for the HAM6 gauge replacement to follow.