CHECK Gas Systems

• GC analysis: SF6 at 6.8%

• Reset of pressure sensors giving problem (elog #2489)
  • To check the grounding
• P&ID test on going with Gianluca (elog #2437)
• Problem with the reading of one flowcell: connector found with a bit of oxidation. Now cleaned and it seems working

• On-going preparation too tart weld next week

• Rack 62 in open mode
• Second line of mixer we have N2 instead of iC4H10

• Add iC4H10 and SF6 to the mixer. Still a problem of calibration for MFCs —> need to set iC4H10 MFC at 4% to have 4.5% in IR
• Increase flow to 400 l/h
• Test on regulation valve (ECONEX) on-going. Next Tuesday need to move ECONEX from rack 74 to rack 83
• Rack 80 ch 7 problem in reading: to check cables in flowcell when there is an access —> Andrea

• MFCs calibration on-going
• Replace Krohne in Exhaust module with a new one
• Gas system will be re-started on Monday and distribution rack 63 must stay in stop

• Add two MFMs in membrane module
• Add new battery for the CF4 storage

• Ar/H2 leak repaired
• MFM of SF6 and iC4H10 don’t work properly. Beatrice to check with David
• Patrick said that calibration of MFM is much time consuming than calibration of MFC (you need to add a valve in front of the MFM for regulation the flow)

• PLC dismounted, new cabling on-going. Next week (on Tuesday) new PLC and software
• IR modification on-going
• There is not reading of detector pressure (DCS is also off): Patrick to check if we can have the reading of chamber pressure
• New compressor module: no reply from Eric, so we will go for installation in the flammable room.
• New compressor module: to find the pump for the purifier gas recuperation

• system stopped and restarted: we took only few ppm of air
• To discuss what tests we want to do

• to check problem on 3-way valve

• Federico can start leak search with new CO2 leak detector for MWPC, RICH1 and RICH2

• Next week planning ok: similar to the one proposed to DT
  • FSU availability ok
• MFC calibration campaign restarted
  • Planning discussed during the meeting
  • Planning available in indico

• Level of PGS sometimes is > 100% —> Michal to check