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Re: TDS meters
> ----- 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
> 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 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.
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