You can use a voltmeter to tell when to stop, but only on a given setup
that's always the same as referenced by an EC meter.
Current, electrode spacing and surface exposure have to be constants for
voltage to tell you anything.
In *making* CS, the voltage is nearly irrelevant, so it needn't be a
constant.
A PPM meter is an EC meter that dilutes the info it gets to suit "salt
water".
Ode
At 09:59 AM 10/19/2009 -0500, you wrote:
115 mA is definitely too much. Unless you mean 115 uA.
115 mA for 10 minutes in 1 liter of water gives 77ppm.
If it really is 115 mA I would suspect that your water (cell) is contaminated.
Dan
On Sun, Oct 18, 2009 at 3:53 PM, Jeff Maahs <[email protected]> wrote:
> I just checked and it's running 155mA. I'll go get a pot as suggested.
>
> Does anyone know of a way to check ppm using voltage or conductivity
> somehow? As it is now I have no idea what my current batch would be.
>
> I'm not getting any cloudiness this time. I wonder if I didn't rinse the
> glass enough with dw the first time.
>
>
> ________________________________
> From: Clayton Family <[email protected]>
> To: [email protected]
> Sent: Sun, October 18, 2009 3:45:27 PM
> Subject: Re: CS>Getting Started
>
> Sort of- it looks like your current may be on the high side, otherwise it
> would not be so much. It is normal- the water electrolyzes, the silver
picks
> it up and it turns to the gunk you see. To control the amount of gunk, you
> can control the current more. That you can do with a resistor, diode or
> potentiometer in series.
> If you clip your wires to a multimeter set to measure milliamps, it should
> read zero when you start- that means there is no current flowing
through the
> water to speak of. As the silver ions continue to go into the water, the
> conductivity increases and the current flow increases along with that. I
> forget what the details are (read formula is), but less than 1 mA
current is
> a good idea if your silver surface area is under a certain - yours looks
> close to mine, and 1mA is what I am using. Just looking to see what the
> current is gives you some clues.
> I got a 75 ohm potentiometer at the surplus store and put it in series to
> keep a lid on the current. Maybe it was a dollar.
> Kathryn
>
> On Oct 18, 2009, at 1:38 PM, Jeff Maahs wrote:
>
> I'm getting a buildup of gunk on one of the rods. I haven't seen this
on any
> of the videos or pictures. Is this normal?
>
> Here's an image if it helps: http://tinyurl.com/yfdskwb
>
> Thank you,
> Jeff
>
>
>
>
>
>
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