Hi Ken, Yes, we had our CS analyzed using AA and compared the readings to PWT readings to come up with the +20% correction factor. I think one has to keep in mind that our CS always tested 85-86% ionic. A different ionic/particulate ratio would require a minor correction factor change. But after all, this isn't rocket science. As far as I'm concerned, the PWT is a great tool for anyone making CS without automatic shutoff and/or current limiting. One can monitor PPM as they go along. With auto shutoff it's not as necessary but it's still a great tool for the person who wants to check the product. It really beats doing lab tests at $20 a pop.
The TDS meters read about one half because the calibration solution is designed to let the meter read one half the ionic content. If you double the reading it will usually come out about the same as the PWT readings except it has no decimal. If you calibrate it with the 84uS solution it will then read the same as the PWT and you won't have to double the reading. Hanna does not use the same correction factor but it doesn't do any good to talk to them about it. We have our differences regarding how to use the meters for measuring ionic silver. They say divide....I say add. I could be wrong but I'm not in doubt. Trem ----- Original Message ----- From: "Ode Coyote" <[email protected]> To: <[email protected]> Sent: Thursday, August 21, 2003 5:50 AM Subject: Re: CS>Re: HVDC and higher ppm > The history of the conversion factor, > Perhaps Trem should answer this one as he set the standard ...be it > accurate or not. > > My take > Trem made batches of CS and sent them in for AA spectrograph analysis for > total silver content, then compared the results to his PWT readings in > microsiemens to come up with the 1.2x fudge factor...at around 20PPM for CS > made the way he makes it. > My experiences say that the TE will vary somewhat, so the fudge factor is > only good within a range. I believe that setting an approximate range to > get an idea was all that was intended, so it's a bendy standard but plenty > good enough for all practical purposes. TE comes from particle content > that meters don't read. > > Hanna says divide PWT microsiemens reading by 2 [more or less] to get PPM > for dissolved solids..they know nothing about CS. > Comparing a PPM meter to PWT meter in the same solution confirms the > doubling well within reason. > > > > At 12:19 AM 8/20/2003 -0400, you wrote: > >url: http://escribe.com/health/thesilverlist/m62084.html > >Re: CS>Re: HVDC and higher ppm > >From: Ode Coyote > >Date: Tue, 19 Aug 2003 06:54:13 > > > >> A PPM meter reading should be doubled for silver ions. > > > >Hi Ken, > > > >Any idea where this factor comes from? I've been researching electrolyte > >conductivity and came up with some data but nothing for Ag+ and OH-. > > > >For example: > > > > 1 PPM of: Approx. microsiemens/cm (20 C) > > MgSO4 0.80 > > MgCl2 1.70 > > KNO3 1.10 > > K2SO4 1.20 > > KH2PO4 0.60 > > K2HPO4 1.04 > > NaCl 1.64 > > (NH4)2SO4 1.50 > > > > http://www.ladyslipper.com/waterq.htm > > ## Theses are all dissolved solids right? I don't really know how > straight single element ions of silver compare. > > > >In this table, cs would get a value of 0.5. This is kind of low, but I > >found values that range from about 0.1 to 10 in the "Pure Water > >Handbook": > > > >http://www.konetic.or.kr/attfile/greenCafe/knlgMaterials/62/osmonics.pdf > >I'm curious how the conversion factor for cs was obtained. Was it > >calculated or measured, or did everyone just agree on some value? > ###Some of all of the above but not in that order? > Measured, compared, calculated , then agreed upon as 'maybe so, maybe > no'... but it's the best we gots that everbody can use without arguing > about whos lab is right, by those who both have and don't have one. > > ..a benchmark in the park that anyone can sit on when they get tired of > trying to figure out where they might otherwise be when it doesn't really > matter much anyhow. > WHEW! LOL > Ode > > > > > > > >Best Regards, > > > >Mike Monett > > > > > >-- > >The silver-list is a moderated forum for discussion of colloidal silver. > > > >Instructions for unsubscribing may be found at: http://silverlist.org > > > >To post, address your message to: [email protected] > > > >Silver-list archive: http://escribe.com/health/thesilverlist/index.html > > > >List maintainer: Mike Devour <[email protected]> > > > > >
