40m QIL Cryo_Lab CTN SUS_Lab TCS_Lab OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop
  ATF eLog  Not logged in ELOG logo
Entry  Mon Oct 25 16:13:47 2021, Aidan, Update, Cryo vacuum chamber, Heater left on - chamber got warm Screenshot_from_2021-10-25_16-19-39.png
    Reply  Tue Oct 26 07:32:52 2021, Aidan, Update, Cryo vacuum chamber, Heater left on - chamber got warm 
       Reply  Tue Oct 26 08:43:38 2021, Aidan, Update, Cryo vacuum chamber, CTC100 temperature alarm and heater shutoff Screenshot_from_2021-10-26_08-42-57.pngIMG_5371.jpgIMG_5396.jpgIMG_5401.jpg
Message ID: 2687     Entry time: Mon Oct 25 16:13:47 2021     Reply to this: 2689
Author: Aidan 
Type: Update 
Category: Cryo vacuum chamber 
Subject: Heater left on - chamber got warm 

The cryocooler was switched off last Thursday to do testing on the JPL_PD. I turned the heater back on during this testing and neglected to turn it off when I finished at the end of the day. As a result, the workpiece reached ~400K over the weekend.

We are now allowing it to slowly cool down.

The CTC100 has a feature to specify an upper limit on temperature and then shut off the heater if that temperature is exceeded. We should engage this going forward.

Attachment 1: Screenshot_from_2021-10-25_16-19-39.png  37 kB  Uploaded Mon Oct 25 17:20:00 2021  | Show | Show all
ELOG V3.1.3-