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Vacuum pump advice?

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Craig Brideau Craig Brideau
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Vacuum pump advice?

Search the CONFOCAL archive at http://listserv.acsu.buffalo.edu/cgi-bin/wa?S1=confocal We are setting up a new lab section and we need to select a vacuum pump to hook up to our vacuum plumbing.  We have a large manifold system that ties multiple vacuum taps together into one central location.  We plan on using a single pump to provide for the whole lab.  My concern is in vacuum stability as users open and close the tap, as well as capacity.  Should I be looking for a pump with a strong vacuum draw (low Torr number), or large displacement (liters/minute)?

Thanks,

Craig
Guy Cox Guy Cox
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Re: Vacuum pump advice?

Search the CONFOCAL archive at http://listserv.acsu.buffalo.edu/cgi-bin/wa?S1=confocal
Craig,
 
             The first thing you should be looking at is a big buffer
tank to even out the fluctuations.  Having a lower Torr than you
need will do very little for you - the difference in the total mass
of air in a chamber at 0.1T vs 1T is tiny.  The displacement is
the key thing - it must be able to handle everyone wanting it at
once.
 
                                                                       Guy
 
Optical Imaging Techniques in Cell Biology
by Guy Cox    CRC Press / Taylor & Francis
     http://www.guycox.com/optical.htm
______________________________________________
Associate Professor Guy Cox, MA, DPhil(Oxon)
Electron Microscope Unit, Madsen Building F09,
University of Sydney, NSW 2006
______________________________________________
Phone +61 2 9351 3176     Fax +61 2 9351 7682
Mobile 0413 281 861
______________________________________________
http://www.guycox.net

From: Confocal Microscopy List on behalf of Craig Brideau
Sent: Tue 08/03/04 8:38 AM
To: [hidden email]
Subject: Vacuum pump advice?

Search the CONFOCAL archive at http://listserv.acsu.buffalo.edu/cgi-bin/wa?S1=confocal We are setting up a new lab section and we need to select a vacuum pump to hook up to our vacuum plumbing.  We have a large manifold system that ties multiple vacuum taps together into one central location.  We plan on using a single pump to provide for the whole lab.  My concern is in vacuum stability as users open and close the tap, as well as capacity.  Should I be looking for a pump with a strong vacuum draw (low Torr number), or large displacement (liters/minute)?

Thanks,

Craig
Craig Brideau Craig Brideau
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Re: Vacuum pump advice?

Search the CONFOCAL archive at http://listserv.acsu.buffalo.edu/cgi-bin/wa?S1=confocal What can I use for the buffer tank?  Is there a particular style, or can I just stick any old pressure tank on the line and draw a vacuum reservoir on it?

Thanks,

Craig


On Tue, Mar 4, 2008 at 1:36 AM, Guy Cox <[hidden email]> wrote:
Search the CONFOCAL archive at http://listserv.acsu.buffalo.edu/cgi-bin/wa?S1=confocal
Craig,
 
             The first thing you should be looking at is a big buffer
tank to even out the fluctuations.  Having a lower Torr than you
need will do very little for you - the difference in the total mass
of air in a chamber at 0.1T vs 1T is tiny.  The displacement is
the key thing - it must be able to handle everyone wanting it at
once.
 
                                                                       Guy
 
Optical Imaging Techniques in Cell Biology
by Guy Cox    CRC Press / Taylor & Francis
     http://www.guycox.com/optical.htm
______________________________________________
Associate Professor Guy Cox, MA, DPhil(Oxon)
Electron Microscope Unit, Madsen Building F09,
University of Sydney, NSW 2006
______________________________________________
Phone +61 2 9351 3176     Fax +61 2 9351 7682
Mobile 0413 281 861
______________________________________________
http://www.guycox.net

From: Confocal Microscopy List on behalf of Craig Brideau
Sent: Tue 08/03/04 8:38 AM
To: [hidden email]
Subject: Vacuum pump advice?

Search the CONFOCAL archive at http://listserv.acsu.buffalo.edu/cgi-bin/wa?S1=confocal We are setting up a new lab section and we need to select a vacuum pump to hook up to our vacuum plumbing.  We have a large manifold system that ties multiple vacuum taps together into one central location.  We plan on using a single pump to provide for the whole lab.  My concern is in vacuum stability as users open and close the tap, as well as capacity.  Should I be looking for a pump with a strong vacuum draw (low Torr number), or large displacement (liters/minute)?

Thanks,

Craig
S. Brunet S. Brunet
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Re: Vacuum pump advice?

Search the CONFOCAL archive at
http://listserv.acsu.buffalo.edu/cgi-bin/wa?S1=confocal

Hi!

Use something intended for vacuum!  Glass or metal will probably do, but what
kind of chemicals might be drawn into the flask?  Water can freeze at low
pressure and collect.  Make sure that the pump oil can be changed safely!

Regards,
Sophie
____________________________________________________
Sophie M. K. Brunet, Ph. D.
Research Officer
Optical Spectroscopy, Laser Systems and Applications
Chemistry 112 sessional lecturer
[hidden email]
306-966-1719 (office)   306-966-1702 (fax)
____________________________________________________
Saskatchewan Structural Sciences Centre
University of Saskatchewan
Thorvaldson Bldg.
110 Science Place
Saskatoon, Sk   S7N 5C9
____________________________________________________


Quoting Craig Brideau <[hidden email]>:

> Search the CONFOCAL archive at
> http://listserv.acsu.buffalo.edu/cgi-bin/wa?S1=confocal
>
> What can I use for the buffer tank?  Is there a particular style, or can I
> just stick any old pressure tank on the line and draw a vacuum reservoir on
> it?
>
> Thanks,
>
> Craig
>
>
> On Tue, Mar 4, 2008 at 1:36 AM, Guy Cox <[hidden email]> wrote:
>
> > Search the CONFOCAL archive at
> > http://listserv.acsu.buffalo.edu/cgi-bin/wa?S1=confocal  Craig,
> >
> >              The first thing you should be looking at is a big buffer
> > tank to even out the fluctuations.  Having a lower Torr than you
> > need will do very little for you - the difference in the total mass
> > of air in a chamber at 0.1T vs 1T is tiny.  The displacement is
> > the key thing - it must be able to handle everyone wanting it at
> > once.
> >
> >                                                                        Guy
> >
> >  Optical Imaging Techniques in Cell Biology
> > by Guy Cox    CRC Press / Taylor & Francis
> >      http://www.guycox.com/optical.htm
> > ______________________________________________
> > Associate Professor Guy Cox, MA, DPhil(Oxon)
> > Electron Microscope Unit, Madsen Building F09,
> > University of Sydney, NSW 2006
> > ______________________________________________
> > Phone +61 2 9351 3176     Fax +61 2 9351 7682
> > Mobile 0413 281 861
> > ______________________________________________
> >
>
http://www.guycox.net<https://www.mcws.usyd.edu.au/exchweb/bin/redir.asp?URL=https://www.mcws.usyd.edu.au/exchweb/bin/redir.asp?URL=http://www.guycox.net>

> >
> > ------------------------------
> > *From:* Confocal Microscopy List on behalf of Craig Brideau
> > *Sent:* Tue 08/03/04 8:38 AM
> > *To:* [hidden email]
> > *Subject:* Vacuum pump advice?
> >
> > Search the CONFOCAL archive at
> > http://listserv.acsu.buffalo.edu/cgi-bin/wa?S1=confocal We are setting up
> > a new lab section and we need to select a vacuum pump to hook up to our
> > vacuum plumbing.  We have a large manifold system that ties multiple vacuum
> > taps together into one central location.  We plan on using a single pump to
> > provide for the whole lab.  My concern is in vacuum stability as users open
> > and close the tap, as well as capacity.  Should I be looking for a pump
> with
> > a strong vacuum draw (low Torr number), or large displacement
> > (liters/minute)?
> >
> > Thanks,
> >
> > Craig
> >
>
Guy Cox Guy Cox
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Re: Vacuum pump advice?

In reply to this post by Craig Brideau
Search the CONFOCAL archive at http://listserv.acsu.buffalo.edu/cgi-bin/wa?S1=confocal
Well, it only has to stand one atmosphere so the specification isn't onerous.  There
are lots of options.  If you know anyone who is scrapping an old Philips EM400 electron
microscope (now 30 years old) it has a particularly big and high-quality buffer tank.  I don't
know the scale of your system so I can't really recommend a capacity but if you can
get 20 litres (5 US gallons) I'd have thought it would do.
 
                                                                                                       Guy

Optical Imaging Techniques in Cell Biology
by Guy Cox    CRC Press / Taylor & Francis
    http://www.guycox.com/optical.htm
______________________________________________
Associate Professor Guy Cox, MA, DPhil(Oxon)
Electron Microscope Unit, Madsen Building F09,
University of Sydney, NSW 2006
______________________________________________
Phone +61 2 9351 3176     Fax +61 2 9351 7682
Mobile 0413 281 861
______________________________________________
     http://www.guycox.net

 

From: Confocal Microscopy List [mailto:[hidden email]] On Behalf Of Craig Brideau
Sent: Thursday, 6 March 2008 9:30 AM
To: [hidden email]
Subject: Re: Vacuum pump advice?

Search the CONFOCAL archive at http://listserv.acsu.buffalo.edu/cgi-bin/wa?S1=confocal What can I use for the buffer tank?  Is there a particular style, or can I just stick any old pressure tank on the line and draw a vacuum reservoir on it?

Thanks,

Craig


On Tue, Mar 4, 2008 at 1:36 AM, Guy Cox <[hidden email]> wrote:
Search the CONFOCAL archive at http://listserv.acsu.buffalo.edu/cgi-bin/wa?S1=confocal
Craig,
 
             The first thing you should be looking at is a big buffer
tank to even out the fluctuations.  Having a lower Torr than you
need will do very little for you - the difference in the total mass
of air in a chamber at 0.1T vs 1T is tiny.  The displacement is
the key thing - it must be able to handle everyone wanting it at
once.
 
                                                                       Guy
 
Optical Imaging Techniques in Cell Biology
by Guy Cox    CRC Press / Taylor & Francis
     http://www.guycox.com/optical.htm
______________________________________________
Associate Professor Guy Cox, MA, DPhil(Oxon)
Electron Microscope Unit, Madsen Building F09,
University of Sydney, NSW 2006
______________________________________________
Phone +61 2 9351 3176     Fax +61 2 9351 7682
Mobile 0413 281 861
______________________________________________
http://www.guycox.net

From: Confocal Microscopy List on behalf of Craig Brideau
Sent: Tue 08/03/04 8:38 AM
To: [hidden email]
Subject: Vacuum pump advice?

Search the CONFOCAL archive at http://listserv.acsu.buffalo.edu/cgi-bin/wa?S1=confocal We are setting up a new lab section and we need to select a vacuum pump to hook up to our vacuum plumbing.  We have a large manifold system that ties multiple vacuum taps together into one central location.  We plan on using a single pump to provide for the whole lab.  My concern is in vacuum stability as users open and close the tap, as well as capacity.  Should I be looking for a pump with a strong vacuum draw (low Torr number), or large displacement (liters/minute)?

Thanks,

Craig


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