Re: [GSAS-Member] CO2 Question

[Erik Olson <erik@thekrib.com>]

Macker,

In the post-Dupla world, most folks these don't use pH-based controllers 
to regulate the CO2, but rather just adjust the flow of the needle valve 
to give a good constant rate.  I think even Amano's stuff doesn't use a pH 
controller. The solenoids are usually just hooked to timers to turn the 
CO2 off at night.

Definitely download Paul's talk from last week -- it's a good watch for 
catching up...

   - Erik

On Mon, 19 Oct 2009, macker wrote:

> Interesting thread. I have a digital co2 system for sale if anyone is
> interested. Im a little confused though.
>
> So, multiple solenoids for multiple tanks, all going off one central
> point... Is it able to keep the co2 to the optimal level individually for
> each tank, based on the #of plants/fish? Thats pretty sweet if true. I don't
> see how it can control a slight release on say, one tank, but stronger as
> another tank just as an example.
>
> Or, is it better to have all your tank water eventually filtered though 1
> primary place, then take PH readings from there? You couldn't control the
> exact Ph per tank, but i guess it would be even across your 'network' of
> tanks.
>
> I don't have a tank anymore, as wife and me are leaving oversees for a moth
> in december, but will. I manage and secure datacenters and like a central
> point of control w/ redundancy, same w/ tanks or anything I would love to
> know about managing all that for multiple tanks. Maybe single controller
> units handle multi tanks?
>
> My setup is Dupla, I just can't see how its scalable for anything other than
> one tank.
>
> - macker
>
> Check valves are designed to stop flow one direction when they see a
>> specific back pressure.  If that back pressure is not met they can weep
>> fluid in the reverse flow direction.
>> Clay Hess
>> 787 Fuselage Systems Integration Manager and Team Leader
>> 425-931-4322
>>
>> ----- Original Message -----
>> From: gsas-member-bounces@thekrib.com <gsas-member-bounces@thekrib.com>
>> To: Greater Seattle Aquarium Society member chat <gsas-member@thekrib.com>
>> Sent: Mon Oct 19 09:16:18 2009
>> Subject: Re: [GSAS-Member] CO2 Question
>>
>> Ah that must be what happened to me. Because I turned off my CO2 at night,
>> water would creep back sometimes. The only issue is, is that not what check
>> vavles are for, to stop water?
>>
>> On Mon, Oct 19, 2009 at 8:42 AM, Doerr, Jesse <Jesse.Doerr@fei.com> wrote:
>>
>>> My experience with plastic check valves is that they work fine for CO2
>>> until they get wet.  Once water gets onto them, it tuns into an accid in
>>> the CO2 and the plastic starts melting away.
>>>
>>> Jesse
>>>
>>> (running DIY pop bottle CO2 infrequently and irregularly)
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-- 
Erik Olson                                                        Sent from my 
crusty old Linux box
erik at thekrib dot com
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