Not quite
Comparing conductivity to PPM as tested by AA Spectrophotometer, PPM and
conductivity are only close 'after' the CS has stabilized and the
conductivity has stopped dropping.
EVERY generator I've tested does the conductivity drop thing.
Try it with yours by metering the CS immediately after its done and again
in 48 hours.
20 uS will drop in a quart sized batch to around 7-8 uS. Even using the
generous 1.2 multiplier, that's 9.6 PPM.
Smaller batches drop less.
A pint batch run to 20 uS drops to around 12 uS
AA Spec testing along with a lab tested identical conductivity for each
sample confirms that both conductivity measurements are the same and 12 uS
and 7 uS are 12 and 7 PPM respectively...within a very narrow margin and
including non dissolved non conductive silver [as TE] at 15%
Total silver with no TE will be even less.
People sending samples to Ole Bob after having their generator shut down at
20 uS and having it test at 7-12 PPM mystified me for a long time.
I thought maybe Ole Bobs Hach unit wasn't accurate, so I send a battery
of documented samples to Frank Keys AA Spec and all was [sigh]
confirmed...and I re-wrote everything and ate crow for a while.
Ole Bobs Hach Colorometer is pretty darned accurate on the average.
What "IS", is a phenomenon that few know about, fewer want to admit
exists and even fewer want to talk about because it complicates a formerly
simple ideal a tosses a lot of traditions out the window.
Why is this so?
I "think" its' because free ions and anions contribute more conductivity
than the dissolved silver compounds that form after the ions and anions
eventually find each other do.
Why this is water volume dependent, I have no idea. [Something similar
to gas particle distribution and pressure laws? No clue here.]
But I did find a way to prevent it to a great degree...a way that confirms
the free ion/anion vs stabilized dissolved silver compound conductivity
difference theory.
That is to run the EIS water through a smallish orifice as it's being
made with the addition of a small amount of heat in order to squeeze the
components into close proximity and use the heat to increase reactivity.
The result comes out about 80% pre-stabilized, dropping from 20 uS to
17-18 uS and staying there, regardless of batch size.
If you make CS/EIS at over around 120 deg F, it's almost guaranteed to go
yellow even at low PPM and that can be an occasional problem unless the
temperature buildup in the 'squeezer' is lowered to match the overall flow
rate and averaged overall temperature of the water so as not to exceed that
threshold in the reaction chamber.
Doing so is very simple.
A "flow though" pump stir system might do the same thing if the tubing is
long enough. [Marshall?]
Ode
At 01:37 PM 12/14/2005 -0500, you wrote:
Well, 16.5 uS is about 19.8 ppm if freshly made, since the multiplication
factor is 1.2 conservatively. That is pretty close to 20 ppm. Mine tops
out at about 21 ppm.
So maybe I should have said EIS of about 20 ppm instead of EIS of over 20
ppm.
Marshall
Stuff wrote:
> At 10:43 AM 12/14/2005, Marshall wrote:
>
> >>The silvergen SG6 is a very good unit. It can produce EIS of over
> >>20 ppm consistantly.
>
> It is a very good unit, but the most I can get out of it is around
> 16.5 uS (unit set on high) measured with
> the Hanna PWT and using starting water that measures .2 to .4 uS
>
> stuff
>
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