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Entry Date
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Nick Name
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Location
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Tuesday, June 02, 2020
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Matt D.
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Connecticut
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Entry 120 of 190 |
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Why Two Controllers?
Even though only one controller is needed, this structure was designed with two controllers with two independent bottles, so the obvious question is… why?
Background…
The large control has an efficient method of CO2 injection that when my exhaust fan comes on (due to heat) it will not inject CO2. This prevents the CO2 from being exhausted out the structure. This controller is set to maintain about 1000ppm (parts per million).
The small controller is set to maintain 400ppm which may seem odd since normal atmospherics CO2 levels are 405ppm.
The Reason…
While the exhaust fan is on during the heat of the day, the ppm of CO2 was dropping to low 300ppm and at times even 280ppm which are levels low enough that growth can be restricted. The reason is during the heat of the day the plant is using more CO2 that can be brought in through the two large vents causing the levels to drop below atmospheric conditions. So, the small controller will come on to maintain 400ppm even during the heat of the day to help ensure the plant is not carbon hungry.
*Both sensors to each controller are mounted physically close to one another so they will not read the exact same ppm, but typically they read with-in 75ppm.
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