<!-- Title: 04:50:40  Fri Jul 27 2001 -->
<!-- Crewchief: DEAN -->
<!-- Op1: WARREN -->
<!-- Op2: &nbsp; -->
<!-- Op3: &nbsp; -->
<!-- Op4: &nbsp; -->
<!-- Op5: &nbsp; -->
<!-- Op6: &nbsp; -->
<!-- Notes: -->
<pre>E-LOG- FRI JUL27-01 </pre>


<!-- Date: Fri Jul 27 06:30:33 2001 -->
Switched to the south vaporizer.
<!-- Author: Steve -->


<!-- Date: Fri Jul 27 06:33:30 2001 -->
Leads are in STANDBY.
<!-- Author: Steve -->


<!-- Date: Fri Jul 27 06:45:34 2001 -->
Lowered dewar level to 58%. There was only 7 psig in BABS.
<!-- Author: Steve -->


<!-- Date: Fri Jul 27 07:02:08 2001 -->
Started A/E mix to tank #3.
<!-- Author: Bill Noe -->
<!-- Comment: Fri Jul 27 11;32;46 comment by...Steve -->
Mix is complete. No problems.
<!-- Date: Fri Jul 27 07:47:05 2001 -->
George Wyatt and Co. are changing out flammable gas heads for the gas shed. Should be no alarms....
<!-- Author: Steve -->
<!-- Comment: Fri Jul 27 07;47;51 comment by...Steve -->
Center Top and Center bottom.


<!-- Date: Fri Jul 27 08:52:51 2001 -->
<table><tr><td><a href=/cgi/elog/det-system-elog.pl?nb=cryo-gas&action=view&page=-224&button=yes target='xxx' onclick='jswindow()'; align=top><img src=/cgi/elog/det-system-elog.pl?nb=cryo-gas&action=view&page=-224  width='300' align='top'></td><td>Noticed some gas heads and O2 heads in trouble, which George bypassed.</a></td></tr></table>
<!-- Author: Steve -->
<!-- Comment: Fri Jul 27 09;45;07 comment by...Steve -->
There is a short to ground. George sees voltage on the ground.

<!-- Comment: Fri Jul 27 10;40;10 comment by...SG -->
The return was shorted in the head. Fixed.


<!-- Comment: Fri Jul 27 14;13;16 comment by...SG -->
George is done replacing outside heads. Back in operation.
<!-- Date: Fri Jul 27 11:01:54 2001 -->
Noticed the COT cold trap stopped filling yesterday at 1300. No alarms on the cold trap alarm page. Nothing in the logbook, either. I paged Dell.
<!-- Author: Steve -->
<!-- Comment: Fri Jul 27 11;14;52 comment by...Steve -->
Talked to Bob Wagner: he said it needs to be regenerated before operating it, so leave it off until Dell returns.



<!-- Date: Fri Jul 27 11:49:02 2001 -->
Added isobutane to CLC West from 7.7 to 8.01 psig.
<!-- Author: KC & Steve -->


<!-- Date: Fri Jul 27 11:57:29 2001 -->
George is working on clean room heads; broken wire tripped the power there. It will be fixed after lunch.
<!-- Author: Steve -->



<!-- Date: Fri Jul 27 14:50:41 2001 -->
Twice in the last several months on CDFS4 (solenoid FIX stuff) the visual basic module3 under the Project User was deleted or moved.  Module3 contains macros used in the solenoid FIX displays. The displays don't work and we can't operate the solenoid if module 3 isn't there.  If this happnes again and I am not here there are some things which can be done.  On the desktop of CDFS4 is the file user.fxg which would have to be placed into C:\WDMACS\PIC\CFMS.  There is alo a text file module3.txt on the cdfs4 desktop.  The solinoid fix macros are in it in text format.  They could be copy and pasted into a  Project user visual basic module.
<!-- Author: Sanders -->


<!-- Date: Fri Jul 27 15:43:16 2001 -->
Jim Shallenberger has affixed the heat tape on the SUVA pipes. (They had started to come loose.) The SUVA level is 3.0 inches now, so it will be interesting to see if the level rises or if that nagging low level alarm comes in again or goes away for good.
<!-- Author: Steve -->


<!-- Date: Fri Jul 27 16:01:37 2001 -->
<table><tr><td><a href=/cgi/elog/det-system-elog.pl?nb=cryo-gas&action=view&page=-225&button=yes target='xxx' onclick='jswindow()'; align=top><img src=/cgi/elog/det-system-elog.pl?nb=cryo-gas&action=view&page=-225  width='300' align='top'></td><td>This is a five day plot of SUVA level, and it has been stable for the last 24 hours.</a></td></tr></table>
<!-- Author: Steve -->


<!-- Date: Fri Jul 27 17:13:25 2001 -->
<pre>Reset the 4 offending silicon cooling absolute pressure transducers using a borrowed smart controller.   Now things are working fine.  3 of the 4 needed to be reset to factory calibrations.   The fourth one (ISL) had a corrupted upper limit.  IT was set to 26.   We reset it to 60 and now it works fine.   Looks like magnetic field was the cause of the problem.   WE did NOT damage the devices.   We do need to figure out a way to shield them before we turn the system on with the IMU steel closed</pre>
<!-- Author: RR -->


<!-- Date: Fri Jul 27 18:33:37 2001 -->
JIM L HERE ALONE --- ALL APPEARS WELL.
<!-- Author: JIM -->


<!-- Date: Fri Jul 27 19:30:49 2001 -->
<pre>Late entry: Changing gas heads in the storage shed. Replace the Center Top with no problems. The Center Bottom was another mater, when disconnecting the ground wire Roberto saw a spark we stopped and measured for voltage agian, we had done this before starting, and saw nothing between +24 and Return. We when in side to see if anything had happened and found that all the devices using R8, S5 C1-8 had gone into trouble. We stopped and page Richard Schmitt and Rob Roser. Rob came to the Cryo Area and met with us. He said to put the system in bypass and try to find out what was happening. After consulting with Jim S., Steve G., KC, and Reberto we measured 28Voltes from the gas heads ground to the chassis also the same between the signal wire and the chassis on all the channels. We came to the conclusion that there was an open ground, Jim found that the ground wire to R8, S5 had been removed and hanging with tape over the end. I retrieved both of the heads and measured the resistances from the -24 return to the chassis and found they were connected. The system had being grounded thought the old Astro head that we removed causing all the items to loss their ground and go into trouble. After the wire was reconnected all the items came back to life. I zeroed and calibrated the two heads that we installed and every thing was fine. 
 
</pre>
<!-- Author: George Wyatt -->


<!-- Date: Fri Jul 27 19:55:08 2001 -->
<pre>Late entry: Changing gas system and head in CDF Clean Room 114 when tracing out the wires one broke and caused an alarm for Clean room 113. Found that was not a broken wire but one that slipped out of a butt splice. Reslipped it all was well. 
Found the Hi Firus Alarm, ODH input and the Low Firus Alarm wires. Installed a new Point watch head and an Astro read back unit, which I had been testing for the last few months. Hooked up the alarm loops zeroed and calibrated the head and tested the system. 
</pre>
<!-- Author: George Wyatt -->