Re: [APD] Using KH reference solutions to measure CO2

[Vaughn Hopkins <hoppycalif at yahoo_com>]

Congratulations, Tom!!   A 15 minute response time is very workable  
and is "instantaneous" compared to the color change method's 2 hour  
time.  How do you manage to find such esoteric things like gas  
permeable membrane "condoms" on such short notice?  In other words,  
where can I buy one?

I worked out a very easy way to adapt my pH probe, which I awakened  
from a deep sleep last night, to a "drop checker", but realized that  
I might get tired standing by the tank for two hours as the reading  
stabilized.

Vaughn H.

On Dec 1, 2006, at 2:40 PM, Thomas Barr wrote:

> Well, I recieve the gas permeable membranes today and slapped
> one on my pH probe and added a KH of 4.0 ref solution of DI and
> baking soda(lab grade). It slips on easy and the rubber O ring
> is pretty tight so I do not expect any leaking of tank water
> inside. I added the KH ref solution and then squeezed the air
> out so there was nothing but KH solution inside before sealing
> the O ring over the tip.
>
> I added 3 mls of solution to the tip/membrane.
>
> I placed this into my tank and measured the CO2.
> It took 15 minutes for the reading to stabilize.
> Not bad.
>
> Once the reading on the pH meter is stable, then you take the
> reading. This time to stablization is key to determining the
> response time.
>
> I'll do a photo set later next week.
>
> Regards,
> Tom Barr
>
> www.BarrReport.com
>
>
>
>
>
>
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