From: ILPI Support <info**At_Symbol_Here**>
Subject: Re: [DCHAS-L] Going Mercury Free - McLeod Vacuum Gauge Replacement?
Date: Tue, 26 Nov 2013 14:26:32 -0500
Reply-To: DCHAS-L <DCHAS-L**At_Symbol_Here**MED.CORNELL.EDU>
Message-ID: 6A41D5E4-2014-4722-A6FC-E1E48580D136**At_Symbol_Here**
In-Reply-To <5FB8F9B5FC470A4E97A1912C11F7921C12F6A101**At_Symbol_Here**>

I used a Varian cold cathode ionization gauge when I ran my lab.  Worked great.  All the advantages you'd expect and none of the issues a McLeod gauge poses (Hg hammer effect, Hg separation, Hg in your vacuum trap, grease streaking).

Something like this is ideal:   I would configure the vacuum manifold with a shutoff valve between the gauge tube and the main line so you don't expose the gauge tube to corrosives and solvents during routine manipulation.

If you need a (bit dated) discussion of the various types of vacuum gauge options, I have some old lecture notes I can pull for you.  Contact me off list.

Rob Toreki

Safety Emporium - Lab & Safety Supplies featuring brand names
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On Nov 26, 2013, at 9:42 AM, Paul Weller <wellerp**At_Symbol_Here**ELON.EDU> wrote:

Has anyone replaced a mercury containing McLeod Vacuum Guage (50-0.1 microns) with a digital model acceptable to the researchers who use the McLeod gauges?
Paul Weller
Paul Weller
Science Laboratory Manager-Chemistry
Elon University
2625 Campus Box
Elon, NC 27244
Phone  336.278..6225


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