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Electron Microprobe Lab, University of Minnesota

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Are you running it with the DPs switched off and cold?

My 840 switches off if the DPs are not warmed up within 30 minutes, but I can leave it pumping the cold DPs (this is all using manual control of the valves, of course) overnight simply by jumping the warmup (not the overtemp) temperature sensing switches on the DPs. 

Maybe your superprobe (which model?) is the same.


BTW, I'm not sure that it's such a great idea to suck on the cold DPs for extended periods as I suspect the DP fluid will get somewhat contaminated with RP oil by backstreaming. But I don't have any foreline traps, maybe you do.


cheers
Ritchie Sims
University of Auckland
________________________________________
From: JEOL-Focused Probe Users List [[log in to unmask]] on behalf of Anthony J. Ruth [[log in to unmask]]
Sent: 02 July 2011 03:49
To: [log in to unmask]
Subject: [PROBE-USERS] disabling 30 minute timer

JEOL Probe Users Listserver

Moderator: Ellery Frahm, [log in to unmask],
Electron Microprobe Lab, University of Minnesota

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The superprobe I am working on is having vacuum trouble. We need to run the
roughing pump for an extended period of time to reach low vacuum and turn on the
diffusion pump, but there is a timer that turns off the system if high vacuum is
not reached in 30 minutes. How can I disable the timer? I have tried adjusting
the potentiometers on the manual pump control panel so that all three pressure
meters report high vacuum, but it still did not disable the timer.