[RASMB] Vacuum Problem Troubleshooting

[John Philo]

Okay, then yes I'd say you definitely have a leak. If you haven't removed
the flash lamp or messed with the photomultiplier tube recently (things that
could produce a vacuum leak) then one possibility is that some object has
fallen onto the top of the chamber, under the sliding door, that is
preventing the door from dropping down completely onto the O-ring to make
the seal. (We've seen this happen.) Also try to clean the underside of the
sliding door too as best you can.

'Hope this helps,

John

From: Prevelige, Peter Edward, Jr [mailto:prevelig at uab.edu] 
Sent: Tuesday, February 07, 2017 2:38 PM
To: jphilo at mailway.com
Subject: Re: [RASMB] Vacuum Problem Troubleshooting

 

On as far as I know.  Set speed to 0 and start 

Sent from my iPhone


On Feb 7, 2017, at 4:34 PM, John Philo <jphilo at mailway.com
<mailto:jphilo at mailway.com> > wrote:

Peter, do you mean it only gets down to 55 microns with the diffusion pump
on or off?

John

 

From: RASMB [mailto:rasmb-bounces at list.rasmb.org] On Behalf Of Prevelige,
Peter Edward, Jr
Sent: Tuesday, February 07, 2017 2:28 PM
To: rasmb at rasmb.org <mailto:rasmb at rasmb.org> 
Subject: [RASMB] Vacuum Problem Troubleshooting

 

Hi All

 

Our XL-A is having problems achieving vacuum. It pumps down quickly to about
100 micron, then slowly down to about 55 micron where it stalls. Can anybody
give me hints on how to go about troubleshooting the vacuum system.  I've
cleaned the chamber and cleaned and regreased the door seal. 

 

Thanks

 

Peter

 

Peter E. Prevelige Jr.

Professor

Dept. of Microbiology, BBRB 416/6

Univ. of Alabama @ Birmingham

845 19th St. South

Birmingham AL. 35294-2170

Phone 205 975-5327

FAX 205 975-5479

prevelig at uab.edu <mailto:prevelig at uab.edu> 

http://www.preveligelab.org

 

 

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