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July 2011

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Subject:
From:
Clayton Loehn <[log in to unmask]>
Reply To:
JEOL-Focused Probe Users List <[log in to unmask]>
Date:
Wed, 6 Jul 2011 07:43:04 -0400
Content-Type:
text/plain
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JEOL Probe Users Listserver

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

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*

Matt and Ellery,

Unfortunately I have never operated a JEOL probe, however on the SX50  
there are several components that are checked during the warmup and  
pump down routine. In the vacuum section of the drawings different  
flowcharts are provided (to show the different pump-down routines  
depending on where you start from) and so some of the components that  
are checked include the position of the gun valve, the position of the  
solenoid valves (both vacuum isolation valves and air inlet venting  
valves) diffusion pump power and temp, and if the pirani gauges are  
operating properly.

I have experienced pirani gauge problems in the past that were due to  
backstreaming some RP oil, in the end a thorough by gentle cleaning of  
the pirani with some Naptha solved our problem. Hopefully JEOL has  
laid out a flowchart to assist with narrowing down where the problem  
may be.

Clayton

Quoting Ron Rasch <[log in to unmask]>:

> Hi,
>
> I don't think your chamber is contaminated as the valves should have  
> closed when the compressor failed. The RP was just left isolated and  
> vented, as it should be, and if wired via the probe would have  
> turned off too.
>
> If the chamber is contaminated with RP oil, I don't think rough (RP)  
> pumping it for hours or days will help much. You can do this in  
> manual mode.
>
> It sounds like the thermal sensors on the DPs have failed, and are  
> sending the wrong signal to the system. It is not uncommon for a  
> system to go down and take a few other components with it.
>
> Good luck,
> Ron
>
>
>
>
> On 06/07/2011, at 12:39 PM, "Matthew Beck"  
> <[log in to unmask]<mailto:[log in to unmask]>> wrote:
>
> JEOL Probe Users Listserver
>
> Moderator: Ellery Frahm, [log in to unmask]<mailto:[log in to unmask]>,  
> Electron Microprobe Lab, University of Minnesota
>
> Post a message: send your message to  
> [log in to unmask]<mailto:[log in to unmask]>
>
> Unsubscribe: send "SIGNOFF PROBEUSERS" to  
> [log in to unmask]<mailto:[log in to unmask]>
>
> On-line help and FAQ: http://probelab.geo.umn.edu/listserver.html
>
> * 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  
> <<mailto:[log in to unmask]>[log in to unmask]<mailto:[log in to unmask]>>  
> wrote:
> JEOL Probe Users Listserver
>
> Moderator: Ellery Frahm, <mailto:[log in to unmask]>  
> [log in to unmask]<mailto:[log in to unmask]>,
> Electron Microprobe Lab, University of Minnesota
>
> Post a message: send your message to  
> <mailto:[log in to unmask]>  
> [log in to unmask]<mailto:[log in to unmask]>
>
> Unsubscribe: send "SIGNOFF PROBEUSERS" to  
> <mailto:[log in to unmask]>  
> [log in to unmask]<mailto:[log in to unmask]>
>
> On-line help and FAQ: <http://probelab.geo.umn.edu/listserver.html>  
> 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  
> [<mailto:[log in to unmask]>[log in to unmask]<mailto:[log in to unmask]>] on behalf of Anthony J. Ruth  
> [<mailto:[log in to unmask]>[log in to unmask]<mailto:[log in to unmask]>]
> Sent: 02 July 2011 03:49
> To: <mailto:[log in to unmask]>  
> [log in to unmask]<mailto:[log in to unmask]>
> Subject: [PROBE-USERS] disabling 30 minute timer
>
> JEOL Probe Users Listserver
>
> Moderator: Ellery Frahm, <mailto:[log in to unmask]>  
> [log in to unmask]<mailto:[log in to unmask]>,
> Electron Microprobe Lab, University of Minnesota
>
> Post a message: send your message to  
> <mailto:[log in to unmask]>  
> [log in to unmask]<mailto:[log in to unmask]>
>
> Unsubscribe: send "SIGNOFF PROBEUSERS" to  
> <mailto:[log in to unmask]>  
> [log in to unmask]<mailto:[log in to unmask]>
>
> On-line help and FAQ: <http://probelab.geo.umn.edu/listserver.html>  
> 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.
>
>

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