The reason for the repetition of this alarm is that the the channel HVE-LX:Y0_110BTORR has been passing through the threshold value (1e-5) since about 10:35 UTC. When we vented it just reported this alarm once, as it should, and then stayed "in alarm" until now. As it has been pumped down, it will switch from being "in alarm" to no alarm and then back forth again. I have turned off Verbal for now as to not annoy the entire control room. The point of the vacuum system alarm in the Verbal system is not necessarily to catch a failure of some sort, the vacuum and CDS teams already have a system in place to alert any sudden changes of pressure and inform the correct people. Rather, it is just a way to inform the operator that one of these failures have may have occured and to make sure that the correct people have already been informed or that venting has truely began.

A possible fix for this is to average the channels over some time, but taking these averages adds a significant amount of time to the loop. Since venting is a very rare event, I think we can just live with it. I don't see any problems with turning off Verbal for a handful of hours while it settles past this threshold. Option B would be to remove this test from Verbal entirely. As I previously said, the VE system is already monitored by other, more precise, systems but my worry is that the operator may not know if there was something going on.

Attached a trend of the channel .