Hepi Pump Trends (Monthly) Famis 39954:
On Jan 26th the HPI-PUMP_EX_PRESS1_PSI started rising in maximum pressure. and on maybe feb 2nd it started getting worse. Seems like it has plateau-ed on Feb 16th, but the Pressure still remains elevated.
That channel back in Oct was between 92.4-92.6 PSI.
And now it's between 91.9 - 93.5 PSI. I'm not sure if this is out of bounds for HEPI.
I have looked at the EX pressures a bit and I suspect that one of the pressure sensors on the EX manifold has gone bad.
On the attached trend, the top 2 traces are PRESS1 and PRESS2, bottom 2 traces are the same pressures at EY. EX PRESS1 starts seeing bigger peak to peak signal starting about 50 days ago, but PRESS2 doesn't see this increase in pressure noise. Second attach image is a zoomed in trend of the same channels. EX PRESS1 seems to have some kind of 1hz oscillation. PRESS2 might be seeing some of this same signal, but not to the same extent. The supply pressure to the VEA at EX definitely doesn't see this 1hz signal, so I think it's either not real or it's being filtered out at the manifold.
I have yet to go down to EX and test this, but I will try to do so this week.
FRS ticket: https://services1.ligo-la.caltech.edu/FRS/show_bug.cgi?id=37356