STAR QA Board

[videbaek <videbaek@bnl.gov>]

Hi

Just to bring to attention that the TPC airflow compressor stopped 
working yesterday around 5 pm,
with subsequent higher temperatures and humidity level above the desired 
42-43%. This has consequences
for the quality of data due to the inner/outer field cage current as 
Gene as discussed earlier
See attached plot of the humidity in TPC air in the last ~24 hours

Alexei L. and Tim C went in today to try to fix today around noon
see their note from the e-log

"TPC IFC blower: Compressor does not stay engaged, intermittently turns 
on/off.
Replaced adjusting current trip contactor: Same issue
Replaced 24V contactor: same issue

It seems like the problem might be with the compressor. Will have to 
have CAD HVAC technicians check compressor and charge levels.
Unit is set to run with compressor off at the moment."



--
Flemming Videbaek
senior scientist
videbaek @ bnl.gov
Brookhaven National Lab
Physics Department
Bldg 510D
Upton, NY 11973

phone: 631-344-4106
cell     :  631-681-1596

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