Pro-Leaf CO2 Controller & Sensor - Automatic CO2 PPM Monitoring and Dosing
Best for: growers running CO2 enrichment who want automatic, sensor-based control instead of guessing at dosing times.
Our thoughts
CO2 enrichment is only worth doing if it's controlled properly - too little and you're wasting gas, too much and you risk stressing plants or anyone working in the room. The Pro-Leaf takes the guesswork out of it with a proper PPM sensor and a light sensor that stops dosing automatically during dark periods, which is exactly the kind of detail that separates a real controller from a basic timer.
The Pro-Leaf CO2 Controller & Sensor monitors CO2 concentration in your grow space using an integrated sensor, and automatically maintains it within a set target range - typically operating between 400ppm and 2000ppm, with an accuracy of around 100ppm. Setup is straightforward: plug the controller into a power socket, then plug your CO2 source (a burner or a regulated bottle setup, such as the Pro Leaf CO2 Regulator) into the controller itself.
It also has a built-in light sensor, so it can automatically stop dosing CO2 during dark periods, when plants aren't photosynthesising and therefore can't make use of the extra CO2. The controller records maximum and minimum readings for later review, runs off a 4.5 metre sensor cable, and is rated to handle up to 10 amps through the connected CO2 source.
How it compares
CO2 controllers range from basic timer-only units to full sensor-based systems, and the Pro-Leaf sits in the sensor-based, automated camp.
- Compared with Titan Controls' CO2 controller range, both offer sensor-based PPM monitoring and automatic dosing, with the Pro-Leaf's built-in light sensor being a particularly useful practical feature.
- Compared with a basic mechanical CO2 timer, a proper PPM sensor controller like this doses based on actual measured CO2 levels rather than a fixed schedule, which is far more efficient with gas.
- Compared with CAP or Autopilot CO2 controllers, all three compete in the same automated-monitoring category, with feature sets like light-sensing and data logging being the main points of comparison.
A genuine sensor-based controller costs more than a basic timer, but it pays that back in gas efficiency and in not guessing whether your CO2 levels are actually where you want them.
Usage guidance
The controller needs a CO2 source connected to it to actually dose gas.
Setup
Plug the controller into a mains socket, connect your CO2 source (burner or regulated cylinder) into the controller, and position the sensor within the grow space away from direct airflow for an accurate reading.
Setting your target level
Set your desired CO2 PPM target within the controller's 400-2000ppm range - most growers aim somewhere in the middle of that range depending on light intensity and ventilation.
Dark period operation
Leave the light sensor enabled so dosing automatically pauses during dark periods, avoiding wasted CO2 when plants aren't photosynthesising.
Technical specifications
- CO2 control range: approx. 400ppm to 2000ppm
- Accuracy: approx. ±100ppm
- Light sensor: built-in, pauses dosing during dark periods
- Sensor cable length: approx. 4.5m
- Max current: 10 amps
- Weight: approx. 1kg
- Data logging: records max/min CO2 readings
- Brand: Pro-Leaf
Who this is for
- Growers running CO2 enrichment who want automatic, sensor-based dosing rather than a fixed timer
- Anyone pairing a CO2 burner or regulated cylinder with proper monitoring
- Growers concerned about wasting gas or over-dosing CO2 without feedback
- New growers setting up their first CO2 enrichment system who want it to run safely without constant checking
Our take
A properly specced CO2 controller with real sensor-based feedback and a useful light-sensing feature, rather than a basic timer dressed up as a controller.
One we sell a lot of for new growers stepping into CO2 enrichment for the first time.
