In a message dated 05/15/2000 9:16:27 AM US Eastern Standard Time,
[log in to unmask] writes:

> It is an
>  excellent machine for contamination testing, it tests the level of NaCl in
>  a 75% IPA/water solution.

Methinks Mr. Noorlag is just funnin' y'all.  None of the bulk ionic
contamniation will tell you anything about how much sodium, how much
chloride, or how much sodium chloride is on the test substrate.  All of these
units return a measure of conductivity or resistivity of the solution,
usually measured in microsiemens/cm or megohm-cms.  That drop in resisitivy,
or rise in conductivity, is measured against how much of an ionizable
material, in this case sodium chloride, it woult take to get the same
drop/rise (respectively).  That is why the output of these instruments is
listed in micrograms of sodium chloride EQUIVALENTS per unit area.  It has
nothing to do with how much sodium or chloride is present.  As my assistant
Dave Morrow indicated, you need an ion specific test method to make such a
determination.

Doug Pauls
CSL

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