At 08:12 AM 4/27/2010 -0700, you wrote:
I need someone here to explain to me how this happened, please.
I use a Colloid Master to make my CS, always set on brew #3, and I always
get a nice clear product that reads 8 to 10 ppm on my Hanna Tester. I
brew in a quart jar, no stirrer, using 6" half-inch-wide pair of
electrodes hooked over the top edge of the jar.
As time goes by, these electrodes wear away in the center -- leaving a
nearly untouched span of silver at both ends -- top end where it's out of
the water, and bottom end where it's suspended in the water. I have been
thinking what a waste of silver this was -- so yesterday I decided to try
something. I folded the electrodes up, so that the wide ends covered the
narrow centers -- thus shortening the electrodes by about a third, but
placing wide bars where the narrow bars usually are. Does this make sense?
## Previously when you mounted the electrodes, the center portions were
consistently closer to each other than the ends, limiting corner/end
discharge in favor of center/edge discharge.
When you folded the ends back over to the center, you shielded those now
narrower edges and started favoring corner discharge and at the same time
effectively made the electrodes smaller, increasing current density and
reducing the conductive interface, thus fooling the "Auto Off" voltage
comparator that now sees the same voltage at a higher water conductivity.
In the SAME water, it would have taken longer to shut down at that higher
conductivity..."seen as" lower when you altered the relationship of voltage
drop to conductivity rise by changing the effective area of the electrodes.
But apparently the water you used started out at a higher conductivity
and at that stage, the difference could be minuscule and still have the
same time result. Even the same water being a little warmer would do it.
Why less conductivity drop? Dunno. That's a variable depending on a lot
of factors. Could be that the smaller ion travel cannel made when you
shortened the electrodes hydrated the ions faster with the higher
concentration of ions in that area.
I've notice the same effect after forcing everything through a small
diameter funnel neck. "Something" sped that process up to nearly be
completed during the process time.
Again, warmer water may have done something.
Ode
OK -- the generator was still set at #3, I used a quart of distilled water
from a gallon from which I had used a quart the day before, turned the
unit on and let it go. It brewed in the same period of time as
always. But when I tested the water, after the unit had turned itself off
(because I wondered if I would get a lower ppm-level) -- I got a whopping
29.6 ppm reading on my Hanna tester. I thought perhaps I was getting an
incorrect reading at the top of the jar, so I stirred it all up and
retested -- same high reading. I let the brew sit overnight to see if it
would change -- it didn't. This morning I had to dilute it with distilled
water in order to get it down to the 10-ppm level that I prefer.
The good news is that one brewing created three quarts of 10-ppm CS,
rather than the usual one quart. But why did this happen?? Can anyone
enlighten me?
MA
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