The Titan Controls Atlas 2 is a preset CO2 monitor/controller that monitors, maintains, and displays the CO2 concentration in your growing environment. It holds a factory-set target of 1500 ppm CO2 with a 100 ppm dead band: when room CO2 falls below 1400 ppm it energizes its 120 VAC outlet to run your CO2 device, and switches it off once CO2 climbs back above the set point. A built-in photocell only enriches during daylight hours and disables the output at night. This page gives the maker’s published set point, electrical, and environmental specs; explains how CO2 enrichment works; and is honest about what Titan does not publish. It is a preset controller: the CO2 source, tank, and regulator or generator are separate.
What it is
The Atlas 2 is Titan Controls’ entry-level, single-set-point CO2 controller. Unlike an adjustable model, it is factory calibrated and preset, so it works out of the box with no target to program. You mount it on the wall, plug it in, and connect your CO2 generator or a regulator on a bottled CO2 tank to its outlet. It reads the room and displays the CO2 concentration on four green LEDs, each marking a minimum concentration. When the load output is on, the maker states the illuminated LEDs flash twice about every three seconds; when the output is off they stay solid. It is a switching controller, not a CO2 source — you supply the generator, or the tank, regulator, and solenoid it turns on.
Guaranteed specifications
| Preset CO2 set point | 1500 ppm (fixed) |
|---|---|
| Dead band | 100 ppm |
| Load turns on below | 1400 ppm |
| Input amperage | 15 Amps |
| Output amperage | 12 Amps |
| Voltage (input / output) | 120 VAC |
| Frequency | 60 Hz |
| Operating temperature | 40°F (5°C) to 125°F (52°C) |
| Storage temperature | 32°F (0°C) to 135°F (57°C) |
| Size | 8" H x 4.5" W x 2.5" D |
| Weight | 1 lb |
| Electrical relay operations | 100,000 cycles |
| Use environment | indoor / inside use only |
Why choose the Atlas 2
- Simplest CO2 control there is. It arrives factory calibrated with a preset target, so there is nothing to program — plug in your CO2 source and it holds 1500 ppm.
- Real closed-loop switching, not a timer. It measures room CO2 and only fires the 120 VAC outlet when the reading drops below 1400 ppm, rather than dosing blind on a clock.
- It will not waste CO2 in the dark. The photocell disables the load output at night while continuing to monitor and display the room’s CO2 level — which matters because CO2 enrichment raises photosynthesis only while light drives the reaction, so enriching in the dark buys nothing.
- Works with a burner or a bottle. The outlet drives either a CO2 generator or a regulator on a compressed CO2 tank, switching up to 12 Amps of load.
Best uses
- Sealed indoor rooms and tents under strong light. Enrichment pays off only when light, not CO2, is the limiting factor, so this suits a sealed space with adequate lighting held within its 40-125°F operating range.
- Growers who want set-and-forget. Because the 1500 ppm target is fixed, there is no set point to dial in — good for a first CO2 build.
- Either CO2 source. A CO2 generator or a compressed-tank regulator both plug straight into the outlet.
- Indoor only. The maker specifies inside use only.
How CO2 enrichment works — and why light comes first
Green plants fix carbon from CO2 during photosynthesis, and raising CO2 above the ambient background can increase the photosynthetic rate, but only while light supplies the energy for the reaction. That is the logic behind the Atlas 2’s design: it holds a 1500 ppm target during the day and, through its photocell, stops dosing at night. CO2 is not a substitute for light: if the canopy is under-lit, enrichment does little, so treat CO2 as the last step after light and climate are dialed in.
How it compares to other CO2 approaches
This table is factual — it does not claim one approach out-performs another; which suits your room is a grower’s judgement.
| Factor | Titan Atlas 2 (preset) | An adjustable CO2 controller | A CO2 timer / flow method |
|---|---|---|---|
| Set point | fixed 1500 ppm | user-adjustable across a range | none — doses on a clock or fixed flow |
| Control | reads room CO2 and switches the outlet closed-loop | reads room CO2 and switches closed-loop | open-loop; does not read room CO2 |
| Night handling | photocell disables output at night | varies by model | needs a separate timer to stop at night |
| Load switching | 12 A output at 120 VAC | varies by model | varies |
Compatibility and operating range
Titan publishes the electrical and environmental limits below; anything it does not state is held rather than guessed.
- Power / load: 120 VAC, 60 Hz, with 15 A input and a 12 A output; the maker directs you to verify the voltage, amperage, and hertz of your source before plugging in.
- Environment: inside use only, 40-125°F operating; the maker warns not to let it get wet or sprayed and to use caution in extremely humid environments.
- Calibration: it is factory calibrated and does not require calibration out of the box; periodic recalibration for sensor drift is directed roughly every three years, done by a one-button calibration to outside air.
- Durability: the relay is rated for 100,000 cycles.
Where it fits
For other options in this part of the catalogue, browse the temperature and humidity category. General store policies are on the about page. A preset CO2 controller pairs with a CO2 source and the sensors and controllers that run the rest of the room:
- Titan Controls Atlas 8 Digital CO2 Controller — an adjustable, fuzzy-logic CO2 controller for growers who want to set their own target.
- Titan Controls Spartan Series CO2 Monitor — a standalone CO2 monitor to read the room independently.
- Autopilot Dehumidifying Humidistat — humidity control to balance the sealed room a CO2 controller enriches.
Frequently asked questions
What CO2 level does it hold? A fixed 1500 ppm target with a 100 ppm dead band; the load switches on below 1400 ppm.
Can I change the target? No — the set point is preset and factory calibrated; for an adjustable target choose a controller like the Atlas 8.
Will it dose CO2 at night? No — the photocell disables output at night, though it keeps monitoring and displaying the level.
How much load can it switch? Up to 12 Amps on its 120 VAC outlet.
Does it include the CO2 source? No — it is a controller; the generator, or tank plus regulator/solenoid, is separate.
Who this is for — and who should skip it
Suited: growers running a sealed or semi-sealed indoor room or tent with adequate light who want the simplest possible CO2 control — a fixed 1500 ppm target, factory calibrated, that stops dosing at night and switches a generator or tank regulator up to 12 A.
Not for / its limits: because the set point is fixed at 1500 ppm, a grower who wants to tune the target to a different level should choose an adjustable controller. It is a controller only — it contains no CO2 and drives, but does not include, the generator, tank, regulator, or solenoid. It is inside-use-only, switches at 120 VAC (240 V gear is out of scope), and enrichment is pointless where light, not CO2, is the limiting factor.
CO2 safety boundary: CO2 is an asphyxiant at high concentration, and enrichment happens in a space people enter. The maker’s own instruction is that if its highest LED indicates a concentration above 2500 ppm you may want to take a break from working in the room and seek fresh air. We could not this session trace a specific human-occupied-space CO2 exposure ppm limit to a Tier-1 source we actually read, so we do not state one — treat a CO2-enriched room as a space needing proper ventilation and monitoring, and consult a current workplace-safety authority for exposure limits before working in an enriched room.
HELD (not stated because not sourced): the maker SKU / part number (not exposed on the maker page read this session); the enclosure material and the CO2 sensor type (these appear only in retailer marketing, not on the maker manual read, so they are held); the warranty term (held per M-05); shelf life; and the live retail price (the storefront price field is the source of truth at deploy).
Ready to add CO2 control to your room? Add to cart, or talk to a grower about whether CO2 enrichment fits your light and setup.
Sources
- Titan Controls — Atlas 2 – Preset CO2 Monitor/Controller, maker product page (titancontrols.net, HTTP 200, retrieved 2026-07-08; the allow-listed maker domain and the machine citation for every device spec on this page): https://www.titancontrols.net/shop/product/titan-controls-atlas-2-preset-co2-monitor-controller
- Titan Controls — Atlas 2 Preset CO2 Monitor/Controller Instruction Manual (Revision H, 12/31/2014, © Titan Controls, www.titancontrols.net). The verbatim source of every published spec: preset 1500 ppm set point / 100 ppm dead band / load on below 1400 ppm; input 15 A, output 12 A, 120 VAC in/out, 60 Hz; size 8″ H x 4.5″ W x 2.5″ D; weight 1 lb; operating 40-125°F, storage 32-135°F; 100,000 relay cycles; four-LED display; photocell day/night behavior; factory calibration; inside-use-only; and the 2500 ppm “seek fresh air” instruction. Maker document, reproduced visitor-reachable on HTG Supply’s server (HTTP 200, retrieved 2026-07-08): https://www.htgsupply.com/wp-content/uploads/2023/01/Atlas-2-CO2-Controller-Instruction-Manual.pdf
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