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AquaticTechTank.net A forum dedicated to design and program aquatic tanks 2015-11-21T09:22:41-05:00 https://aquatictechtank.com/feed.php?f=11&t=11 2015-11-21T09:22:41-05:00 2015-11-21T09:22:41-05:00 https://aquatictechtank.com/viewtopic.php?t=11&p=546#p546 <![CDATA[Re: Co2 Sensor version 2!]]>
I tried this new configuration where the cap in front seals off a section and the tubes run directly into the CO2 sensor. The fan and humidity sensor is in front.


The response rate is .003ppmw/sec. Slower that the original design.

Statistics: Posted by mistergreen — Sat Nov 21, 2015 9:22 am

]]> 2015-11-14T12:11:42-05:00 2015-11-14T12:11:42-05:00 https://aquatictechtank.com/viewtopic.php?t=11&p=545#p545 <![CDATA[Re: Co2 Sensor version 2!]]> I'm going to try to reduce/ seal off the area around the membrane and feed the gas in that chamber directly to the CO2 sensor via an air tube.

Statistics: Posted by mistergreen — Sat Nov 14, 2015 12:11 pm

]]> 2015-11-13T11:15:03-05:00 2015-11-13T11:15:03-05:00 https://aquatictechtank.com/viewtopic.php?t=11&p=544#p544 <![CDATA[Re: Co2 Sensor version 2!]]>
This is the log overnight. The response rate is surprisingly slow with this sensor. The rate is faster out of water. I guess the volume of air inside the encasing is too much for a fast response.

Statistics: Posted by mistergreen — Fri Nov 13, 2015 11:15 am

]]> 2015-11-12T17:48:59-05:00 2015-11-12T17:48:59-05:00 https://aquatictechtank.com/viewtopic.php?t=11&p=543#p543 <![CDATA[Re: Co2 Sensor version 2!]]>


I added a 1 liter yeast diffused it a piece of chopstick and circulated with a powerhead in a 5 gallon bucket. I stopped at 60ppmw. It was recording every 7 seconds so I changed the code to record every 10 minutes instead.

CO2 is still climbing. It's at 100ppmw at last check. I pulled out the CO2 to see it tapered out. Who knew DIY CO2 can go that high. I guess it'll keep climbing if nothing consumes it or diffuse it out of the water. I guess shutting off CO2 at night is a good idea.

Statistics: Posted by mistergreen — Thu Nov 12, 2015 5:48 pm

]]> 2015-11-09T21:57:45-05:00 2015-11-09T21:57:45-05:00 https://aquatictechtank.com/viewtopic.php?t=11&p=542#p542 <![CDATA[Re: Co2 Sensor version 2!]]>

2" pvc plug with cord grip


Inside I had to thin the top off with a router.


Trap adapter for the silicone membrane.


The adapter has a washer inside which I used with the membrane and silicone for safety measure.


The hardware: Arduino, CO2 senseAir K-30 10%, 5v fan, DHT-22 humidity & temperature sensor.
The fan is for circulation, and the humidity sensor is to alert me if it's too high or if a possible leak. The membrane is porous enough for H2O molecule to pass through. If the humidity is too high, I can remove the plug.




The fit was too snug and the board broke in half so I kept it.


Final product. I'm out of the CO2 game but I'll set up a yeast reactor in a bucket to test. I'll send the data to a mysql database online. I'll post the result soon.

Statistics: Posted by mistergreen — Mon Nov 09, 2015 9:57 pm

]]> 2014-06-01T11:20:10-05:00 2014-06-01T11:20:10-05:00 https://aquatictechtank.com/viewtopic.php?t=11&p=506#p506 <![CDATA[Re: Co2 Sensor version 2!]]>
http://www.mbari.org/education/internsh ... ategui.pdf
Cost is around $500-$600, the most expensive being the Teflon AF (amorphous fluoroplastic resin) tube at $300 at biogeneral.com. I'm assuming the teflon tube you buy on ebay for $5 is not the same stuff.
The teflon can be found here as well
http://www.sigmaaldrich.com/catalog/pro ... &region=US


I'll add an attachment in case this link no longer works

Statistics: Posted by mistergreen — Sun Jun 01, 2014 11:20 am

]]> 2014-03-25T17:28:39-05:00 2014-03-25T17:28:39-05:00 https://aquatictechtank.com/viewtopic.php?t=11&p=501#p501 <![CDATA[Re: Co2 Sensor version 2!]]> Statistics: Posted by mistergreen — Tue Mar 25, 2014 5:28 pm

]]> 2014-03-23T09:30:53-05:00 2014-03-23T09:30:53-05:00 https://aquatictechtank.com/viewtopic.php?t=11&p=497#p497 <![CDATA[Re: Co2 Sensor version 2!]]> Statistics: Posted by mistergreen — Sun Mar 23, 2014 9:30 am

]]> 2013-10-18T15:31:07-05:00 2013-10-18T15:31:07-05:00 https://aquatictechtank.com/viewtopic.php?t=11&p=475#p475 <![CDATA[Re: Co2 Sensor version 2!]]> They are essentially doing exactly what you have done. They reference the exact hardware, PTFE, design and function. They compare this method to other academic research methods. It may answer some of the question you have had.

Statistics: Posted by Zorfox — Fri Oct 18, 2013 3:31 pm

]]> 2013-07-06T15:53:15-05:00 2013-07-06T15:53:15-05:00 https://aquatictechtank.com/viewtopic.php?t=11&p=470#p470 <![CDATA[Re: Co2 Sensor version 2!]]> So my tank really has 15 ppmw of co2. This low value makes sense since my 30k sensor broke, I'm using the 10k. I'm getting black beard algae as a result and the plants hardly pearl. The fish are happy though. My only concern is the fish's health and behavior when the sensor reads 16K+ppmv.

I've taken the co2 controller offline and have been doing it the old fashion way for the past few weeks.


Sent from my iPad using Tapatalk HD

Statistics: Posted by mistergreen — Sat Jul 06, 2013 3:53 pm

]]> 2013-07-06T15:10:02-05:00 2013-07-06T15:10:02-05:00 https://aquatictechtank.com/viewtopic.php?t=11&p=469#p469 <![CDATA[Re: Co2 Sensor version 2!]]> Statistics: Posted by mistergreen — Sat Jul 06, 2013 3:10 pm

]]> 2013-07-03T15:13:18-05:00 2013-07-03T15:13:18-05:00 https://aquatictechtank.com/viewtopic.php?t=11&p=468#p468 <![CDATA[Re: Co2 Sensor version 2!]]> Statistics: Posted by kkara4 — Wed Jul 03, 2013 3:13 pm

]]> 2013-07-03T06:36:07-05:00 2013-07-03T06:36:07-05:00 https://aquatictechtank.com/viewtopic.php?t=11&p=467#p467 <![CDATA[Re: Co2 Sensor version 2!]]> Statistics: Posted by gregorian — Wed Jul 03, 2013 6:36 am

]]> 2013-06-07T20:00:32-05:00 2013-06-07T20:00:32-05:00 https://aquatictechtank.com/viewtopic.php?t=11&p=460#p460 <![CDATA[Re: Co2 Sensor version 2!]]>

Statistics: Posted by mistergreen — Fri Jun 07, 2013 8:00 pm

]]> 2013-06-06T16:18:12-05:00 2013-06-06T16:18:12-05:00 https://aquatictechtank.com/viewtopic.php?t=11&p=459#p459 <![CDATA[Re: Co2 Sensor version 2!]]> I'll post a picture of the current iteration tomorrow.

Statistics: Posted by mistergreen — Thu Jun 06, 2013 4:18 pm

]]>