Reports until 17:39, Friday 01 November 2019
LHO VE
kyle.ryan@LIGO.ORG - posted 17:39, Friday 01 November 2019 - last comment - 18:50, Friday 01 November 2019(52902)
Instrument air PT199 "LOW" alarms this weekend

Operators Note:

As part of an ongoing investigation that is looking at correlated IFO noise to the pressure cycling? value? of the instrument air, the pressure band (High - Low) has been changed.  Expect PT199 "LOW" alarms all weekend.  Please pass this on to the incoming operator. 

Comments related to this report
patrick.thomas@LIGO.ORG - 18:36, Friday 01 November 2019 (52906)
Link 

Can we change the thresholds on the control room alarm handler? If so, what would be good upper and lower limits?
chandra.romel@LIGO.ORG - 18:47, Friday 01 November 2019 (52907)
Link

You can reduce the lower threshold to 54 psi until we can make adjustment next week. 50 psi is when the pneumatic GVs start to sag.

patrick.thomas@LIGO.ORG - 18:50, Friday 01 November 2019 (52908)
Link 

Temporarily changed low alarm limit through EPICS:

vacuum@vacuum1:~$ caput H0:VAC-MR_INSTAIR_PT199_PRESS_PSIG.LOW 54
Old : H0:VAC-MR_INSTAIR_PT199_PRESS_PSIG.LOW 59
New : H0:VAC-MR_INSTAIR_PT199_PRESS_PSIG.LOW 59
vacuum@vacuum1:~$ caget H0:VAC-MR_INSTAIR_PT199_PRESS_PSIG.LOW
H0:VAC-MR_INSTAIR_PT199_PRESS_PSIG.LOW 54