Re: TDS meters

[Wright Huntley <jwwiii at pacbell_net>]

gallareto wrote:
> ----- Original Message -----
> From: "Wright Huntley" <jwwiii at pacbell_net>
> To: <killietalk at aka_org>
> Sent: Wednesday, February 05, 2003 1:38 AM
> Subject: Re: TDS meters
> 
> 
> 
> 
>>Conductivity is, indeed, what they measure, but we all seem to use the
>>tds-calibrated versions. MicroSiemens don't mean much until you go through
>>the conversion.
>>
> 
> I write to remember that USA are not all the world, here in Europe we use
> microsiemens :-)

Only a few do, for aquatics, AFAIK. Same here in the US. :-)

It is not an English/Metric thing. Scientists and engineers world-wide use 
mg/L (ppm, roughly) to express solution density or tds. MicroSiemens (uS) 
is quite useful when dealing with the electrical properties of solutions, 
but mg/L is more directly what we are concerned about when adding salt, 
dilution of tap water, etc.

The conversion is simply a rough factor of 2, so it isn't a big deal when 
we are needing precision of only 25-50%, usually, anyway.  We want to know 
percent difference between 2 solutions, 90% of the time, and uS and tds 
(by meter) will agree exactly on such ratios.

> Maybe is the time to write a good site about conversions from killi-people
> from all the world :-) when I traslate from non metric users is always a
> pain in *** *** :-)

As an engineer, I have to agree. Fortunately, we all have cheap 
calculators that do that job for us. I certainly prefer metric units to 
archaic terms such as microfurlongs per millifortnight. :-)

Wright

-- 
Wright Huntley -- 209 521-0557 -- 731 Loletta Ave, Modesto CA 95351

      All K-Mart and Walmart stores to be closed in Iraq.
              They will be replaced by Targets.

                     www.sfbaka.net



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