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TDS: PPM vs. percent
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Discussions > Coffee > Q and A > TDS: PPM vs....  
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andys
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andys
Joined: 10 May 2003
Posts: 857
Location: NY
Expertise: Just starting

Espresso: Speedster, Londinium 1
Grinder: EK-43,Robur, HG One, M3
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Roaster: PIDed Popper
Posted Tue May 5, 2009, 5:03pm
Subject: Re: TDS: PPM vs. percent
 

gt Said:

OK so this explains why I see no difference in my 300ppm hard city water vs distilled water when using my analog refractometer - right?

300/1,000,000 = .0003 = .03%

Posted May 5, 2009 link

Yes, you are correct. Of course there are $10,000 analog laboratory refractometers that can tell the difference between 300ppm water and 310ppm water. But an inexpensive handheld brix refractometer cannot.

 
-AndyS
picture page:  http://flickr.com/photos/andy_s/sets/
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gt
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Joined: 29 Jan 2007
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Location: Mpls/St Paul MN
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Posted Tue May 5, 2009, 8:11pm
Subject: Re: TDS: PPM vs. percent
 

Thanks Andy,

I always wondered, when looking at the charts, why my 1250ppm coffee registered 1.5 brix but my hard water versus distilled water showed no difference.
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jonr
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Posted Sun Nov 24, 2013, 5:49pm
Subject: Re: TDS: PPM vs. percent
 

What's the conclusion on using a conductivity based TDS meter for espresso?  Say not for absolute accuracy but for comparison purposes?
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DavecUK
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Joined: 21 Sep 2005
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Posted Tue Nov 26, 2013, 9:42am
Subject: Re: TDS: PPM vs. percent
 

I cannot believe that conductivity based TDS meters are still being used to measure coffee quality, talk about the SCAA jumping on any moneymaking pseudo scientific bandwagons. It's total rubbish and bad science, whatever happened to taste!

Put away the TDS meter, make your coffee and then taste it...taste good, then keep doing it, taste bad then change things, bean, temp extraction time, grind etc..

P.S. Too much of this disingenuous marketing crap in coffee....as for the SCAA, it seems to me that they are there to represent business not the consumer....in the UK we have various "Trade" bodies and they are as much use to the consumer as a "sponge leg"
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andys
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andys
Joined: 10 May 2003
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Location: NY
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Espresso: Speedster, Londinium 1
Grinder: EK-43,Robur, HG One, M3
Vac Pot: Yama
Drip: various
Roaster: PIDed Popper
Posted Tue Nov 26, 2013, 5:55pm
Subject: Re: TDS: PPM vs. percent
 

DavecUK Said:

I cannot believe that conductivity based TDS meters are still being used to measure coffee quality, talk about the SCAA jumping on any moneymaking pseudo scientific bandwagons. It's total rubbish and bad science, whatever happened to taste!

Put away the TDS meter, make your coffee and then taste it...taste good, then keep doing it, taste bad then change things, bean, temp extraction time, grind etc..

P.S. Too much of this disingenuous marketing crap in coffee....as for the SCAA, it seems to me that they are there to represent business not the consumer....in the UK we have various "Trade" bodies and they are as much use to the consumer as a "sponge leg"

Posted November 26, 2013 link


Feel better now?  :-)

 
-AndyS
picture page:  http://flickr.com/photos/andy_s/sets/
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DavecUK
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Joined: 21 Sep 2005
Posts: 1,452
Location: UK
Expertise: I love coffee

Posted Tue Nov 26, 2013, 7:43pm
Subject: Re: TDS: PPM vs. percent
 

andys Said:

Feel better now?  :-)

Posted November 26, 2013 link

No!....grrrr
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