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Message from discussion FYI: Fresh Cup - "The Water Issue" - August
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Barry Jarrett  
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 More options Jun 4 2005, 4:30 pm
Newsgroups: alt.coffee
From: Barry Jarrett <ba...@rileys-coffee.com>
Date: Sat, 04 Jun 2005 20:30:27 GMT
Local: Sat, Jun 4 2005 4:30 pm
Subject: Re: FYI: Fresh Cup - "The Water Issue" - August
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On Mon, 30 May 2005 15:58:02 -0500, jim schulman

<jim_schul...@ameritech.net> wrote:

 >On Mon, 30 May 2005 19:45:17 GMT, Barry Jarrett
 ><ba...@rileys-coffee.com> wrote:

 >
 >>
 >> >Also, brewed coffee is at 1.25% solubles; espresso presumably at
 >> >6.25%.  That's 12,500 to 62,500 ppm. So you'll need to dilute, or get
 >> >a more expensive model that goes over 2000 ppm to do golden cup spot
 >> >checking.
 >>
 >>brewed coffee is in the 1250 ppm range.  tds meters below 2000ppm work
 >>just fine.
 >
 >Must have added a zero.
 >
 >But I'm puzzled: If coffee contains 1.25% solubles, that's 12.5 mils,
 >and 12,500 parts per million.
 >
 >What am I missing?

sorry i didn't get back to you sooner on this...

what you're missing is the factor of 10 correlation between
conductivity and amount of solubles extracted:  not all coffee
solubles are conductive, and the ratio of conductive to non-conductive
stays pretty constant in the extraction/dilution range normally found
for brewed coffee.

so, there are 12,500 ppm of solubles, but only 1/10th of them conduct
electricity.     :)


 
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