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*

Hi Ritchie,

I am Anthony's partner in getting the probe functional. The model is a
JXA-733. We have tried running with both the DP on and off. The DP does get
hot when turned on but the system still shuts down after 30 minutes of
continuous operation. We wish to pump continuously on the system at the
advice of our supervisor. The system originally failed when the compressor
failed allowing the the RP to pump on atmosphere for days on end. This is in
turn caused the RP to fail. It has since been replaced. It is his belief
that the chambers are now inundated with oil vapor and must be purged
through continuous RP pumping.

Best,

Matthew Beck
Illinois Institute of Technology

On Tue, Jul 5, 2011 at 1:26 AM, Ritchie Sims <[log in to unmask]> wrote:

> JEOL Probe Users Listserver
>
> Moderator: Ellery Frahm, [log in to unmask],
> Electron Microprobe Lab, University of Minnesota
>
> Post a message: send your message to [log in to unmask]
>
> Unsubscribe: send "SIGNOFF PROBEUSERS" to [log in to unmask]
>
> On-line help and FAQ: http://probelab.geo.umn.edu/listserver.html
>
>
>
> *
>
> 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
>
> Post a message: send your message to [log in to unmask]
>
> Unsubscribe: send "SIGNOFF PROBEUSERS" to [log in to unmask]
>
> On-line help and FAQ: http://probelab.geo.umn.edu/listserver.html
>
>
>
> *
>
> 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.
>