First, I highly recommend you to have a separate air supply for your
instruments.
The type of compressor that I like and recommend is a screw compressor. I
mentioned "the type that I like", because I had been trying to convince my
boss, our department director, etc., etc. (for more than six years) to replace
our two cylinder compressor (5 H.P., 208 V single or triple phase, 80 gallon
tank, where its price is around $2,000 in Puerto Rico) with a screw type one,
but I couldn't.
One problem is that the cost of a screw compressor could be three times higher
if compared with a cylinder compressor of the same power. Therefore if compared
with the compressor that I mentioned before the price of a compressor of the
same power is ~$6,000 (plus).
The efficiency of a screw compressor is higher, required less maintenance, and
is noiseless.
If you need more information about the other items that I recommend for the
installation of a compressed air system let me know.
We have connected to our compressor a QE-300 (C/H) a DPX-300 (multinuclear, VT)
and a DRX-500 (multinuclear, VT, CPMAS) and a Nicolet IR. We also have people
that temporarily use air from our compressor.
To solve our problem we will separate our air system. We are installing two
(cylinder) compressors like the of 5 H.P. mentioned above (one is old and a new
one, bought recently) for the NMR instruments only.
Have a nice day,
JOE
-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ JOSE R. MARTINEZ ORTIZ Tel. (787)764-0000 x4819 UNIVERSITY OF PUERTO RICO e-mails:joenmr@uprnmr1.chem.uprr.pr DEPT. OF CHEMISTRY joenmr@worldnet.att.net PO Box 21352 UPR Station jomartin@rrpac.upr.clu.edu San Juan PR 00931-1352 http://uprnmr1.chem.uprr.pr ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~