[RASMB] Vacuum Problem Troubleshooting

[Walter Stafford]

Hi Peter,

Check the tubing for the diffusion pump to the roughing pump. 


Walter Stafford
wstafford3 at walterstafford.com

"No problem can withstand the assault of sustained thinking." - Voltaire (1694 - 1778),

> On Feb 7, 2017, at 17:54, John Philo <jphilo at mailway.com> wrote:
> 
> 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 <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 <http://www.preveligelab.org/>
>>  
>>  
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