From: ILPI Support <info**At_Symbol_Here**ilpi.com>
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>
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: http://www.mksinst.com/docs/UR/943DS.pdf
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.
Safety Emporium - Lab & Safety Supplies featuring brand names
Fax: (856) 553-6154, PO Box 1003, Blackwood, NJ 08012
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?
Science Laboratory Manager-Chemistry
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