Ref: http://escribe.com/health/thesilverlist/m59160.html
Re: CS>Current from both sides
From: Robert Berger
Date: Mon, 19 May 2003 14:10:14
> Hi Mike,
> First I do not calculate conductance, I measure it!!! I set up an
> DMM with an AC current scale. and made it into an mho meter. The
> AC supply is from a 120 to 12 volt xfmr loaded with back to back 9
> volt zeners and a 5 K pot. in series. I adjust the voltage so that
> a 100k 1% resistor measures 10 uS or micro mhos.
> I have a one cubic centimeter cell made out of two 1 cm X 3 cm
> plates mounted on a 1 cm thick plastic handle so that 1 cm
> projects from the end of the plastic. The backsides and edges are
> insulated.
> Works GREAT!!
> The anode is curved to a 2" radius and the rod cathode (3/64"
> brass) is 1 3/4" from the anode, almost on the center of the
> theoretical circle.
> The edges on one of my plates have been rolled, another I have
> insulated them with lacquer.
> The mounting point for the sheets are on the back side down about
> 1 or 2 inches from the top.
> "Ole Bob"
Hi Robert,
Just out of curiosity, why do you clip the sine wave? This may work
OK with a peak-sensing AC dvm, but it will give a true rms the fits
as the line voltage changes.
Also, what dvm do you use? I calculate the current as 9 / 100e5, or
about 90 uA p-p. That should give a reasonable reading on the 200 uA
range.
I love your 1 cc cell. If I were interested in measuring ppm, that's
what I would use.
On the edge current, I'm afraid I have to go with Ken on this one.
There is no question that sharp edges concentrate the field due to
the smaller radius of curvature. That's why high voltage equipment
uses metal caps with rolled edges to increase the radius of
curvature and eliminate corona.
It might be difficult to measure much difference in the total cell
resistance, but the current has to be concentrated at the edges.
This increase the density of the ion cloud, which leads to misting,
large particle generation and eventual plateout.
Ken's comparison of the wear patterns between flat sheet and round
wire bent into a U-shape is highly illuminating:
http://escribe.com/health/thesilverlist/m59156.html
That's why I prefer plain 12 ga wire bent into a "W" shape. Lots of
surface area, and no sharp edges to concentrate the field. Like Ken,
I'd use 10 ga if I could find it.
Best Regards,
Mike Monett
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