(see WP #6332)

Did a few "on/off" states for Robert S. so as to compare spectra while IFO in low noise.  He OK'd the continued running of these pumps during the intended bake-out of pressure gauge PT180 located on BSC8's dome.  As is, the apparatus is ready to go with the exception of the gauge electronics which remain connected and energized.  I am ignorant as to the impact, if any, of removing this while it is energized.  I've been told that this gauge has an in-vacuum PCB that limits the bake temperature to 80C at the CFF and I can just see myself going through the bake exercise only to have to vent and replace the gauge because I had "popped" the internal electronics by removing the external electronics while energized!  Spoke with Patrick T. who is only familiar with the Beckhoff end of things, left msg with Richard M. who might know more pertaining to the hardware.  Mfgr. tech support is not available via phone during off hours etc....  

As such, I am leaving PT180 exposed to the site vacuum volume (YBM) and the pumps etc. running.  The locally mounted turbo pump is isolated from PT180 via a closed metal valve and its exhaust valve is open to the supporting pumps located on the LVEA floor.  I will attempt to start the actual bake-out on Friday - hopefully by then I will have determined how to de-energize the gauge or discounted the concern of removing the external electronics while energized.