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People who need the absolute best CO2 controller available today, use the PPM-2a from C.A.P. Fuzzy Logic(tm) gradually brings the CO2 level up to the desired setting without over-shooting the desired CO2 level.
The PPM-2a automatically "dials-in" the exact parameters for your area. It learns how your grow area uses CO2 and adapts to keep the CO2 levels constant.
The PPM-2a can be connected to a temperature or environmental controller, disabling the CO2 function while your exhaust fans are running to reduce CO2 waste.
The PPM-2a is capable of being used to control both compressed CO2 and gas-burning CO2 generators.
When used with a CO2 generator, the user can change the PPM-2a mode to ON / OFF control which eliminates the rapid cycling of the CO2 generator. The PPM-2a will control any make of CO2 valve or generator that is 120 volts.
More info (PDF format)
C.A.P. PPM-2A - The Fuzzy™ CO2 Controller:
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$562.95
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