How often does your co2 cycle?

I got an Atlas 7 running a 12x12 room. Everytime I go in there the output is never on. I have the room extremely sealed... and it's always reading 1200 ppm of co2 on the Atlas 7. It's my first time using co2 so I'm unsure at the rate of it being active.. My controller is either broken.. or it just dispenses extremely quick to where I never catch it on. How long does a 20 lb tank usually last yall?

4x8x8 I get almost a month @ 1000ppm average. 20lb tank. 12/12.

Never used the Atlas 7.
Did you calibrate it outside?

Turn off the co2 and see if the levels drop on the sensor.

TintEastwood said:

4x8x8 I get almost a month @ 1000ppm average. 20lb tank. 12/12.

Never used the Atlas 7.
Did you calibrate it outside?

Click to expand...

I calibrated it indoors.

TintEastwood said:

4x8x8 I get almost a month @ 1000ppm average. 20lb tank. 12/12.

Never used the Atlas 7.
Did you calibrate it outside?

Click to expand...

Duuuudeeeee thanks for mentioning this! This may be my problem. The manual does say to ONLY calibrate outside. Thank you.

Snob said:

Turn off the co2 and see if the levels drop on the sensor.

Click to expand...

Great idea! This will definitely help.

Another thing to consider. Plants put out CO2 at night. So expect elevated levels when the lights come on if you are sealed.