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Re: Vacuum pump (fwd)

Original poster: <sroys@xxxxxxxxxxxxxxxxx>



---------- Forwarded message ----------
Date: Fri, 18 Nov 2005 05:48:37 -0500
From: Mike <mike.marcum@xxxxxxxxxxxx>
To: High Voltage list <hvlist@xxxxxxxxxx>
Subject: Re: Vacuum pump (fwd)

I just use a run-of-the mill Robinaire refridgeration pump ($200 or so if I 
remember right, including a micron guage). Goes down to 20 microns, which is 
way below crackle tube/glow discharge level, but still not that good of a 
vacuum for insulation purposes. Oh and 1 atmosphere = 29.92 " Hg  = 760 Torr 
= 1013 mB = 760,000 microns = 14.7 psi = 101325 pascals  from here 
http://www.ilpi.com/msds/ref/pressureunits.html

Mike

----- Original Message ----- 
From: "High Voltage list" <hvlist@xxxxxxxxxx>
To: "hvlist" <hvlist@xxxxxxxxxxxxxxxxx>
Sent: Thursday, November 17, 2005 4:05 PM
Subject: Vacuum pump (fwd)


> Original poster: <sroys@xxxxxxxxxxxxxxxxx>
>
>
>
> ---------- Forwarded message ----------
> Date: Wed, 16 Nov 2005 22:54:13 +0000
> From: GEORGE STEIN <afa2fg@xxxxxxx>
> To: hvlist@xxxxxxxxxx
> Subject: Vacuum pump
>
> Hey Folks,
>   I am looking to buy a vacuum pump for a variety of HV experiments,
> crackle tubes, lightning tubes etc. I find measurements in three different
> measures: In.Hg. ,Torr ,&  mb. Does anyone have a good conversion table 
> for
> these measurements?? What would be a good low number to work towards when
> buying a pump, short of buying the most expensive one I can afford???
>   Hope this is not too off-topic on this list...
>
> Thanx
> George Stein
> Bedford, Va
>
> [Steve Hansen's "The Bell Jar" (www.belljar.net) is an excellent source of
> information for the amateur vacuum experimenter.  Check out
> http://www.belljar.net/basics.htm for vacuum basics, including units of
> pressure measurement. SRR]
>
>
>