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  1. HR3 Manual
  2. HMI Interface and Connectivity Manual
  3. Liquefiers (A B) Manual
  4. Purifier Manual
  5. QT System P&ID Information
  6. Coldhead Compressors Manual
  7. HMI Cabinet Manual
  8. Pneumatic Air Supply Manual

Check this page before and after the system is restarted → Operational Configuration

Routine Maintenance Procedures

PurposeInstructions/Links
Cleaning (Liquefier)
  1. Dewar Cleaning Procedure (using the transfer line)
  2. Dewar Cleaning Procedure (using the outlet MFC and its bypass)
  3. Liquefier Cleaning when Dewar contains LHe
Cleaning (Purifier)
  1. Cleaning QT purifier Helium-space (pumping-purging the purifier)
  2. Cleaning QT purifier LN2 space
Cleaning (HR3 piping)Purging HR3 after a maintenance
Cleaning the buffer tankCleaning the Buffer Tank on the Cryoplatform
Cleaning the filters F1, F2, F3, and the filter before MV101Cleaning the filters F1, F2 at HR3
Cleaning the filter at MV101
Fills

Filling LN2 to the purifier using the outside LN2 tank
Filling LN2 to the purifier using a portable Dewar

Taking purity measurements at various places in the system

Measuring gHe purity


General/Other Procedures

PurposeInstructions/Links
System Startup Procedure

QT System Starting Procedure

QT PLC (only) restart procedure

How to restart the QT PLC

Cooldown

Look At Updated Page

For planned power outage

Shut Down and Restart Procedures

Taking purity measurements at various places in the system

Measuring gHe purity


Troubleshoots

IssueReasonWhat to do?
If QT-HMI has an alram window opened and showing the codes 603 and 602It's a known warning from some software development → close the windowHR3 Tripped Warning Message
If the QT-HMI got frozen
How to fix the QT-HMI if its screen got frozen
If the Dewar level indicators have large fluctuationsLevel sensor tubes are contaminatedFixing dewar level indicator
FNAL Approved procedure: https://seaquest-docdb.fnal.gov/cgi-bin/sso/ShowDocument?docid=10401
Coldheads blocking alarmPossible contamination
or cold heads have been running so long without any intake gHe for a while
  1. Resolving Liquefier Blocking Alarm when Liquefier is on Liquefy Mode
  2. Resolving Liquefier Blocking Alarm when Liquefier is on Idle Mode






Useful Information

  1. The volume of an outside gHe tank: 1600 cubic feet (V = 45306.95 L)
  2. 100 slm rate on Magnet FC is equivalent to ~ 192 LHe liters per day (i.e. assuming both LQ A and B are running)

Useful Contact Information


  1. Cryofab : https://www.cryofab.com/contact
    Call +1 (800) 426-2186 and ask for extension #14 (Mr. Tam)
    Tell this serial number and he will recognize us
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