Kyle, Gerardo, Chandra

We moved PT-245 cold cathode gauge cable to the full-range hot cathode gauge on turbo inlet temporarily for the bake exercise (which caused some alarms today). Thus, the pressure readout (at PT-245 on MEDM) is not accurate - will calibrate in software on Monday; need to read out the voltage displayed on MY screen and convert to mbar per the attached plot. Current reading is 2.38 V which converts to 8e-8 mbar or 6e-8 Torr. Since screen shots read remotely don't capture voltage, we put the voltage display up in the control room, found here: https://lhocds.ligo-wa.caltech.edu/cr_screens/png/video0-1.png

We started to test CP4 regen. First flowed GN2 through the reservoir at 20-50 SCF/H (after LN2 was vaporized in tower outside). Regen controls system needed some work - discovered a few thermocouple wires were backwards, at both the Watlow heater and Beckhoff rack and one of the exhaust TCs does not work due to some broken wires in well - TE252B (note cable in Watlow controller is labeled 253, not 252). We need to figure out how to satisfy the two gate valve "closed" interlocks. We tried to jumper the limit switch signal at Beckhoff, and also the pin switch for LOTO. We'll work with Richard and Patrick on Monday to see what signals the software is looking at. Once we override this interlock we will test the regen heater and Watlow over-limit switch.

Attached are a couple RGA scans from today and from Tuesday. Note that today's scan was taken after cold GN2 was passed through CP4 so there may have been some water pumping. Both are faraday mode.