Late entry from Friday night.

Jordan, Gerardo (remote), Betsy (remote)

On Friday night (6/19) Gerardo noticed the purge air dewpoint had risen above our -40C requirement and continued to rise. Out of precaution, I came on to the site to check the purge air status and see if any HAM/BSC door covers had blown off the flange.

All door covers were in place, so no issue there. I then isolated the purge air from the lvea for ~30 minutes, therefore dropping the demand/duty cycle of the air comporessor, to see if the dewpoint changed. It slowly began to drop and I took local dewpoint measurements at the sample port just past the filters on the purge air skid. There was no significant difference in dewpoint when the drying towers cycled, the dewpoint remained around -38C regardless of which tower was drying. 

After ~30 minutes, the dewpoint had dropped to -43C and so I reopened the purge air to the lvea, then reduced the flow at the purge air port on the output tube. It seems there was just too much demand on the compressor.

As of this morning, the dewpoint has returned to normal -51C at the drying towers.