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Old 02-06-2005, 07:23 AM   #1 (permalink)
 
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Default CO2 consumption survey

For the latest couple of months I have done some automatic pH-measurements in my tank. I use an own built pH-controller/meter. It has a serial PC-interface which I can use to see how the CO2 is changes due to different conditions/parameters 24 h/day. It is a great tool to gain knowledge of the CO2 level in planted tanks. Of course, it can run as an ordinary controller as well. The housing is a $5 modified timer and the PCB is home built with a $2 micro controller as the hart of the system:
http://193.12.137.241/bluesboy/viewimage.php?id=205
http://193.12.137.241/bluesboy/viewimage.php?id=209

The pH-value and the status of the solenoid valve is stored on my web sever at regular basis 24h per day with a client-server solution. This is how the result could look like if I select one day:
http://193.12.137.241/bluesboy/pHplott.php?t=2004-12-25

The black line is pH-level and the red is the solenoid valve (on=7, off=6).

Recently I found out how much the (surface) water circulation is affecting the CO2-level:
http://193.12.137.241/bluesboy/aquab...tlinks/sum.php

To put some more data to this subject in general, I have just started a very simple survey to see how much CO2 different tanks are consuming. It is quite rough, but it’s interesting to see how it can differ. The main input is how long time a known mount of CO2 is lasting (NOT DIY). To be able to compare different set-ups, I have added some extra information as well.

I would be very happy if you could add your parameters in my database to get it more complete. Some Swedish forum members have just started.

http://193.12.137.241/bluesboy/aquab...mption/sum.php

Just follow the link ”Add new period”. Any questions? Just post it here or send me an email.

Thank you in advance.
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Old 02-08-2005, 11:35 PM   #2 (permalink)
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Interesting. I'm in!

Why is there no response in this interesting thread?
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Old 02-09-2005, 06:24 AM   #3 (permalink)
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Interesting thread. I added my info

Just for clarification a US 5lb bottle is 2270g?

My CO2 use seems to be on the low end, I find that surprising being the tank is open, the circulation is heavy and I keep the level above 40ppm.
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Old 02-09-2005, 09:56 AM   #4 (permalink)
 
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If I had anything other than DIY I would love to participate! Someday soon i hope!
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Old 02-09-2005, 10:09 AM   #5 (permalink)
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This sounds like an interesting idea, perhaps the end of the "24/7 or not" debates

I did similar observations on my own tanks but it will be nice to see the results of a larger number of tanks with varying conditions.

Giancarlo
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Old 02-09-2005, 10:49 AM   #6 (permalink)
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Oh darn, I just realized I put down a 10# tank.... No wonder the consumption is so high....
It it editable or do I have to start over?
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Old 02-09-2005, 11:41 AM   #7 (permalink)
 
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Nice to get more data to play with
It will be interesting to see the variations between tanks and then start to find out parameters affecting the consumtion.

Quote:
It it editable or do I have to start over?
No, just send me an e-mail [email protected] with new data and I will correct it.
However, if you have more than one CO2-period - just add it to the list with the same name.

Last edited by BluesBoy; 02-09-2005 at 11:45 AM..
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Old 02-09-2005, 01:39 PM   #8 (permalink)
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Very interesting...

I seem to be using abnormally small amounts of CO2 even though the ph/KH is giving me in general over 30mg/l...

But I'm not getting heavy pearling; some, but not alot. Tom Barr has been repeating over and over again that most people's CO2 levels are probably lower than they think.

Maybe this is my case?
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Old 02-09-2005, 09:52 PM   #9 (permalink)
 
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I have now changed the data for JanS (bottle size). The new consumption is 7.13.
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Old 02-10-2005, 02:24 PM   #10 (permalink)
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Thank you BluesBoy. That sounds much better.....
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