Testing air exchange system?

Nan's Nook : Archives : Cakes : Fanning : Air pump & Bubbler : Testing air exchange system?
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By Mr. Tambourine Man (Tambourine_Man) on Friday, February 01, 2002 - 07:11 pm: The Nook

Hi, how can tell if your air exchange system is doing enough to get rid of CO2 on its own? Is there any kind of a "test" of any kind that you could run? Thanks!

By Ron (Clubbenguy) on Friday, February 01, 2002 - 07:29 pm: The Nook

Put a mouse in the terrarium....if it dies, there isnt enough oxygen. Lol, j/k....just trying to bring some humor to the board. I think there may be a little strip, similiar to the temp and humiity strips you can stick the the side of the terrarium that measures the CO2 content, but I dont know where who how or when to find it. Good luck man.

By Ron (Clubbenguy) on Friday, February 01, 2002 - 07:30 pm: The Nook

Try this, http://www.77hydro.com/cgi-bin/acatalog/77_Hydro_Carbon_Dioxide_CO2__54.html

By Mr. Tambourine Man (Tambourine_Man) on Friday, February 01, 2002 - 07:57 pm: The Nook


Awesome, thanks for the info! But, I'm not sure how that "CO2 Test Kit" works. It looks like a syringe, so I think it's gotta be to test the CO2 content of water? Is that right? Any ideas?

By Ron (Clubbenguy) on Friday, February 01, 2002 - 10:23 pm: The Nook

Not sure, i just went to www.google.com and typed "CO2 testing kits" and there was a bunch of sites. I am not sure, but the last CO2 test kit on the bottom of that screen said "to test the CO2 levels in your grow area." Wasnt sure what that meant but GOOD LUCK!!

By Ryan Waters (Zerogravity) on Saturday, February 02, 2002 - 04:46 am: The Nook

Excellent thread Mr. Tam! (In other words you beat me to it!)

Stamets says the CO2 should be less than 5000ppm when fruiting so it would be good to know what is going on in the terrarium. After all the other parameters are easy to gauge (temp, light, & humidity)so why not CO2.

Found 3 links that may be useful.

1. Electronic, lots of $ but each test is free

2. Looks simple and inexpensive but results take 4 hours.

3. This is the syringe that was mentioned earlier. You simply suck in the air and results are within 2 minutes. Syringe is roughly $25 - 40 but each test will cost you between 6-9 (all pricing is USD) This syringe system is the most common method my quick search revealed. This tells me it would be easy to get at any hydroponics store.

Would be good to make sure these will go above 5000ppm just in case you are too high and want to see by how much. Ambient atmosphere is between 300 - 500 ppm.

By Ron (Clubbenguy) on Saturday, February 02, 2002 - 06:21 am: The Nook

Well if you went to the link I mentioned, they offer the syringe testing method in which you get two test syringes and the test kit for 18.95 (plus shipping).

By Hatcher (Hatcher) on Saturday, February 02, 2002 - 07:34 am: The Nook

Cain't say for shore guys, but, I'd guess I'd be speakin' for most of tha people here in saying "don't worry 'bout it." Remember the KISS principle I say. Posting has been goin' on 'bout even the need/frequency of fanning. And, like was mentioned, by exchanging the air, you're eliminating your humidy, which has to be restored..possibly(he was sure of it, I'm skeptical,) affecting size and yield. In either case, ya still gonna have to provide the extra water..

By Brettiejams (Brettiejams) on Saturday, February 02, 2002 - 08:07 am: The Nook

Co2 is heavier than o2, so if the exhaust hole is near the bottom of the terrarium you can bet that it is a good concentration of co2 that is escaping, even if the air coming in to displace the lost air isn't entering with enough force to mix the gasses well.