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Re: [APD] Dissolved O2 membranes
So, do you envision this as a product we would buy from the probe
manufacturer - A CO2 probe? The only downside I see to that is that
it offends my DIY sensibilities, but I do notice that I haven't been
trying to make my own pH probe either, so I can hardly object. I'm
guessing that this will be a nice lab instrument for the "serious"
hobbyest, not the dilettante hobbyest like me. And, I don't have
much doubt that it will work.
On Dec 2, 2006, at 9:31 PM, Thomas Barr wrote:
> Both David and Vaughn has expressed some doubts as to the
> ability of a DO memebrane used for DO meters/readings for
> adaptation to CO2 pH probe measurements.
> Nice try, but the KCL solution is retained by the DO memebrane
> just like a bicarbonate solution would be and the transfer rates
> for CO2 are similar across the teflon or the higher
> permability(but less durable) membranes.
> I've spoken with American Marine and with Milwaukee already
> about converting their DO probes over to a pH/baking soda ref
> This way we have a nice screw on cap membrane and the pH probe
> in there instead of an O2 probe. We do not use a KCL
> electrolyte, rather a baking soda electrolyte.
> There is no reason this will not work as I have described and be
> extremely accurate, durable as a DO probe.
> Both dissolved gases will pass through these membranes.
> Tom Barr
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