Hi all,

We have a DeltaPlus that has been OFF for ~six months and had lost its calibration prior to being turned off. It ran hydrogen mostly but CO2 as well via dual inlet. After turning it on, pumping it down, and finding no signal on hydrogen or carbon dioxide while doing mass scans with respective gases in the bellows, despite having emission and high voltage, power to amplifiers, and a functional magnet regulator, I swapped the filament. Now I have tiny peaks (200 mV on cup 2, mass 44). After I saw I had peaks, I closed the electronics door thinking it was a tuning issue and the signal dropped to 20mV rapidly but not stepwise. I opened the door and it climbed to 150 mV, not as rapid but earnest still. Any thoughts for the reduced sensitivity and the electronics cabinet door? Thank you!

andy

 
Andrew Schauer
ISOLAB
Department of Earth and Space Sciences
University of Washington
Seattle, WA 98195 
206.543.6327
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