Generally, the 20ma [to 40 ma] has nothing to do with "controlled"
current. This is a 'current limitation' to prevent the generator from
burning itself up if the electrodes short out. [Usually a series resistor
or grain of wheat light bulb]
So far, I have not seen recommendations for true current control [where
the voltage drops as the conductivity increases] that exceeds 1 ma.
I find it difficult to make clear CS at 1 ma and over, though constant
stirring may be of help. [Why, I don't know but it does seem to help.]
Baking soda is not necessary or recommendable for LVDC generators. Time
is. Seeding with a little of a previous batch reduces the time factor
without contaminating it.
k...@czen
At 12:05 AM 5/20/00 -0600, you wrote:
Hi list,
I am new to this list, but have designed and experimented with many CS
generators over the last few years (I am an EE). But I need some help
with the electro-chemistry aspects. For a DC generator, I have seen
conflicting recommendations on the best constant current to use. For
example, one recommends 20 ma., and another says use less than 1 ma. Some
say particle size is smaller when less current and more time is used for a
given PPM. What is the list wisdom on the value of constant current to use?
I have made both low voltage DC generators (which requires a bit of baking
soda for proper conductivity) and high voltage DC generators (which don't
need any additive to the steam distilled water). Is the optimum current
the same for both low and high voltage constant current generators?
Thanks,
Steve Young
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