Solcielo lawrencia;117253 said:Stainless steel will contain iron so there is a magnetic attraction. The power of the magnet may not be strong enough if it isn't close enough to the steel. In any case, anything that can rust will eventually rust unless you coat it with some kind of clearcoat. Another issue is that the CO2 must outgas into the drop checker cavity. This can be a slow process so a device that can also agitate the aquarium water as well as the dkH solution will increase the speed of the drop checker reading.
1.
One better, if you run a small dosing pump with the exposed solution over a thin layer of KH ref solutions and then run the dosing effluent into a small pH photometer, now you have a relatively decent design.
It would be a simple hang on design.
My patent pending though
This is how we run many samples through lab spects in research, the automated pump spits in the new, and sucks out the old.
Making the chamber that is exposed to gas interface with the treatment(the aquarium in this case) and using the pH color indicator with the reference KH solution would be all that is needed.
This could be set to run and data log say each 15 min, or each hour or at 2-4 hour intervals etc.
Or just hit a button, then wait a few minutes, then hit "read sample".
Could set one up for about 150$.
Two better:
Another simple way would be to forgo the indicator altogether. Use the dosing pump and long thin layer of KH ref solution inside the tank in the gas chamber, then simply measure pH with a pH probe or pH pen that's reasonably accurate.
I'll likely make one of these since I have a spare dosing pump sitting here.