Janos, Dave:

After review of the current pressure alarms, we came up with the following changes:

1. Janos requested that PT120B (BSC2-BS) be replaced with PT132_MOD2 (BSC3-ITMX). The latter is a less noisy signal.

2. For alarms where the high level is an order of magnitude greater than the signal average, reduce the high to be about 3*avg

These changes were made and installed at 13:50 during the reboot of cdslogin.

To help with the review of the vacuum alarms I wrote a python program which compares the alarm HIGH value with a hours worth of minute trend data (AVG and MAX). If MAX/HIGH > 10 it flags the channel.

Code output before the change:

Compare Vac Alarm levels with past 1 hour of data
     H0:VAC-LX_X4_PT144B_PRESS_TORR   VE gauge, LX X1-beamtube, CC: high=5e-08 avg=2.27E-09 max=2.29E-09 ratio=2.18E+01!
     H0:VAC-MX_X1_PT343B_PRESS_TORR   VE gauge, MX X1-beamtube, CC: high=5e-09 avg=1.91E-09 max=1.93E-09 ratio=2.59E+00
     H0:VAC-MX_X5_PT346B_PRESS_TORR   VE gauge, MX X2-beamtube, CC: high=5e-09 avg=1.34E-09 max=1.35E-09 ratio=3.70E+00
     H0:VAC-EX_X1_PT523B_PRESS_TORR   VE gauge, EX X2-beamtube, CC: high=5e-09 avg=1.16E-09 max=1.17E-09 ratio=4.27E+00
     H0:VAC-LY_Y4_PT124B_PRESS_TORR   VE gauge, LY Y1-beamtube, CC: high=5e-08 avg=3.08E-09 max=3.15E-09 ratio=1.59E+01!
     H0:VAC-MY_Y1_PT243B_PRESS_TORR   VE gauge, MY Y1-beamtube, CC: high=5e-09 avg=1.39E-09 max=1.41E-09 ratio=3.55E+00
     H0:VAC-MY_Y4_PT245B_PRESS_TORR           VE gauge, MY CP4, CC: high=5e-09 avg=1.32E-09 max=1.34E-09 ratio=3.74E+00
     H0:VAC-MY_Y5_PT246B_PRESS_TORR   VE gauge, MY Y2-beamtube, CC: high=5e-09 avg=1.73E-09 max=1.77E-09 ratio=2.83E+00
     H0:VAC-EY_Y1_PT423B_PRESS_TORR   VE gauge, EY Y2-beamtube, CC: high=5e-09 avg=1.28E-09 max=1.29E-09 ratio=3.87E+00
     H0:VAC-LY_Y3_PT114B_PRESS_TORR VE gauge, CP1 LY vac gauge, CC: high=5e-08 avg=2.30E-09 max=2.33E-09 ratio=2.14E+01!
 H0:VAC-LX_Y8_PT132_MOD2_PRESS_TORR       VE gauge, PT120B BSC2 CC: high=2e-07 avg=1.94E-07 max=1.95E-07 ratio=1.03E+00
     H0:VAC-LY_X0_PT100B_PRESS_TORR                       HAM1 VAC: high=5e-06 avg=3.34E-08 max=3.35E-08 ratio=1.49E+02!

Code output after the change:

Compare Vac Alarm levels with past 1 hour of data
     H0:VAC-LX_X4_PT144B_PRESS_TORR   VE gauge, LX X1-beamtube, CC: high=6e-09 avg=2.28E-09 max=2.30E-09 ratio=2.61E+00
     H0:VAC-MX_X1_PT343B_PRESS_TORR   VE gauge, MX X1-beamtube, CC: high=5e-09 avg=1.92E-09 max=1.94E-09 ratio=2.58E+00
     H0:VAC-MX_X5_PT346B_PRESS_TORR   VE gauge, MX X2-beamtube, CC: high=5e-09 avg=1.34E-09 max=1.35E-09 ratio=3.69E+00
     H0:VAC-EX_X1_PT523B_PRESS_TORR   VE gauge, EX X2-beamtube, CC: high=3e-09 avg=1.17E-09 max=1.17E-09 ratio=2.56E+00
     H0:VAC-LY_Y4_PT124B_PRESS_TORR   VE gauge, LY Y1-beamtube, CC: high=9e-09 avg=3.10E-09 max=3.17E-09 ratio=2.84E+00
     H0:VAC-MY_Y1_PT243B_PRESS_TORR   VE gauge, MY Y1-beamtube, CC: high=5e-09 avg=1.40E-09 max=1.41E-09 ratio=3.54E+00
     H0:VAC-MY_Y4_PT245B_PRESS_TORR           VE gauge, MY CP4, CC: high=5e-09 avg=1.33E-09 max=1.34E-09 ratio=3.72E+00
     H0:VAC-MY_Y5_PT246B_PRESS_TORR   VE gauge, MY Y2-beamtube, CC: high=5e-09 avg=1.74E-09 max=1.77E-09 ratio=2.83E+00
     H0:VAC-EY_Y1_PT423B_PRESS_TORR   VE gauge, EY Y2-beamtube, CC: high=5e-09 avg=1.29E-09 max=1.29E-09 ratio=3.86E+00
     H0:VAC-LY_Y3_PT114B_PRESS_TORR VE gauge, CP1 LY vac gauge, CC: high=6e-09 avg=2.32E-09 max=2.35E-09 ratio=2.55E+00
 H0:VAC-LX_Y8_PT132_MOD2_PRESS_TORR           VE gauge, PT132 BSC3: high=6e-07 avg=1.94E-07 max=1.95E-07 ratio=3.08E+00
     H0:VAC-LY_X0_PT100B_PRESS_TORR                       HAM1 VAC: high=9e-08 avg=3.34E-08 max=3.35E-08 ratio=2.68E+00