Ok Thanks Trem:
I guess I have been short changing myself then?.. I have been taking
final reading, subtract initial water reading and then dividing by
2...Quite a substantial difference from your method Hu??
Grant..
Trem wrote:
>
> Hi Grant,
>
> We take the final reading, subtract the initial water reading and multiply
> by 1.2. For more accuracy it's best to wait 24 hours because the ionic
> content will drop during that time.
>
> I usually just take the initial PWT reading right after the unit shuts off
> and it is plenty close enough without having to wait and then apply the
> correction factor.
>
> Remember, this isn't rocket science and close is plenty good enough for most
> folks.
>
> Trem
>
> ----- Original Message -----
> From: "Grant" <g...@island.net>
> To: <silver-list@eskimo.com>
> Sent: Thursday, May 30, 2002 9:49 AM
> Subject: Re: CS>TDS-1 versus PWT for measuring PPM
>
> > Sorry Trem:
> > What I meant was what is final formula for the "PWT", not
> > the TDS-1..
> > Tks Grant..
> >
> > Trem wrote:
> > >
> > > Hi Grant,
> > >
> > > I really don't know since we will not sell them. I bought one years ago
> > > thinking it might be the unit to use and provide to our customers but
> soon
> > > after discovered the PWT meter was the unit of choice.
> > >
> > > I just took the average of 3 PWT readings of some CS that measured 20 uS
> > > (water was 1.6 uS so total PPM was 22) and measured it with the TDS-1.
> It
> > > measured 7 so guess I would multiply by 3 to get the same PPM as the
> PWT.
> > >
> > > Of course I have no idea if the TDS is reading correctly but if it is
> then
> > > the correction factor would apply to anyone else's TDS meter when
> measuring
> > > CS with the same ionic content as our CS.
> > >
> > > Hope this helps.
> > >
> > > Trem
> > >
> > > ----- Original Message -----
> > > From: "Grant" <g...@island.net>
> > > To: <silver-list@eskimo.com>
> > > Sent: Wednesday, May 29, 2002 8:20 PM
> > > Subject: CS>TDS-1 versus PWT for measuring PPM
> > >
> > > > Hi Trem:
> > > > ` So what's the final formula for the TDS 1???
> > > > `Is it half the pwt reading plus 20%.??
> > > > Tks.. Grant..
> > > >
> > > >
> > > >
> > > > ***********************
> > > > Hi James, I don't mean to jump in when you addressed the post to Dean
> > > > but the fact is that the PWT reads CS much better than the TDS-1 for
> > > > several reasons as pointed out on our website. Also, you do NOT
> divide
> > > > by half when using the PWT. You ADD to the reading. In the case of
> our
> > > > generators you add 20%. Hanna is right in telling you to cut the
> > > > reading in half IF you're measuring dissolved solids such as minerals
> in
> > > > the water. However, we as CS users are interested in measuring the
> > > > content of CS to determine what silver content we have. In this case
> > > > the meter only measures the ionic portion of CS. And that reading is
> > > > always less than the total amount of silver content because the meter
> > > > will NOT read the colloidal portion. Therefore one has to add to the
> > > > reading to get the total PPM. The correction factor will be the
> > > > difference between how much of the mix was colloidal versus ionic.
> We
> > > > have had our CS analyzed by atomic absorption spectrophotometry and it
> > > > is generally always the same ratio. Another thing I forgot to mention
> is
> > > > the fact that the TDS-1 has an accuracy tolerance of + - 2% of full
> > > > scale. Since the TDS-1 reads from 0-999 that's + - 20 PPM. Since
> the
> > > > PWT reads from 0-99.9 and has the same percentage of accuracy that's
> + -
> > > > 2 PPM. And the PWT gives you a decimal point in the reading while the
> > > > TDS-1 reads in whole numbers only. I hope this helps clear up some of
> > > > the controversy about the TDS-1 versus the PWT. The PWT is the best
> > > > choice hands down for measuring PPM.T
> > > >
> > > >
> > > > --
> > > > The silver-list is a moderated forum for discussion of colloidal
> silver.
> > > >
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> > > >
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> > > >
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> > > >
> > > >
> > > >
> > > >
> >
> >
> >
> >
