Hi Steve,
We only use polarity switching in our SG7 Pro. The reason was because we
wanted to have a strong current gradient in the water to get the process
started quickly and that required the electrodes to be close together since
we only use about 75-80 volts at the start. We run 30 ma. current. I
haven't noticed any difference in production time because we never tried to
not switch polarity. If we didn't switch polarity only 2 of the 4
electrodes would deteriorate and we want them to all go away evenly. We
get an output of about 2 gallons an hour at 5 PPM. If there was a
difference in output from switching I don't think it would amount to
much. The current recovers in a second or so after switching, as seen on a
DVDM. That may not hold true if there is a lot of buildup on the electrode
surface which probably would occur if the switching time was very long. I
think the oxide acts as an insulator so short switch times are essential to
good recovery each cycle. Getting it off before buildup is good. Also,
moving the water with a pump speeds up the recovery time between cycles.
Hope this helps.
Trem
At 08:01 PM 1/12/2002 -0700, you wrote:
Trem and all,
When one polarity switches every 30 to 45 seconds or so, using a constant
current, by about what factor does the the rate of production decrease? I
believe during the transition period CS production stops or at least slows
down until a new steady state condition is reached. Do you see 10% or so
reduction in rate of production? Or, does it take longer for your generator
to switch off when the voltage across the electrodes reaches the selected
value?
Thanks,
--Steve
----- Original Message -----
From: "Trem" <[email protected]>
To: <[email protected]>
Sent: Saturday, January 12, 2002 10:10 AM
Subject: Re: CS>changing polarity
> Hi Willy,
>
> We reverse polarity every 40 seconds on one of our models so the
electrodes
> do not need to be cleaned. Because they are very close to each other that
> would make them difficult to clean. By reversing polarity, they are
pretty
> much self cleaning. There is a discoloration on both electrodes and they
> all (4) wear out at the same rate. Electron microscope photos show the CS
> to be of fine quality. Polarity switching is also done by one other
> manufacturer I know of.
>
> Every time the polarity is switched, teh current drops and after the
> elemental silver is forced off the electrode, it rises to normal levels
> within a very brief period of time. I believe if you let it go for 5
> minutes, there might be quite a long sag in current until all teh loose
> siolver was removed. Our experience is that 30 to 45 seconds is about
> right for our situation. We use an array of 1.5" wide by 5" wetted depth
> electrodes spaced about 3/8" apart.
>
> Trem
>
>
--
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