The AC Infinity UIS Controller AI+ (CTR89A) is the 8-port smart grow room controller, supplied with the CO2 sensor in the box. Same controller as the standard AI+, with one extra input that changes how your extraction runs.
Without CO2 data a controller guesses at fresh air exchange. It runs the fan on a timer, or off temperature and humidity, and hopes the plants have something to breathe. With the sensor fitted it reads the actual CO2 level in the room and pulls air only when the plants have drawn it down.
Do you need the CO2 version?
If you are sealed, supplementing CO2, or running a room tight enough that CO2 gets drawn down between exchanges, yes. If you have a well-ventilated tent on a normal extraction cycle, the standard Controller AI+ does everything else this one does, for less. You can add a sensor later.
What the CO2 sensor adds
- CO2-triggered fresh air exchange – the extraction runs when the ppm drops, not on a fixed timer.
- CO2 logged alongside everything else – ppm sits in the same charts as temperature, humidity and VPD, so you can see what your room actually does overnight.
- Alerts on CO2 – catch a stalled room or a failed exchange before it costs you growth.
- Works with supplementation – if you are running a generator or bottles, this is what stops you venting expensive CO2 straight out of the room.
Everything the AI+ already does
- Eight ports – fans, lights, pumps and humidifiers from one hub, expandable with UIS splitters.
- WiFi and Bluetooth – full control from the AC Infinity app, wherever you are.
- 4" touchscreen – live readings, timers, graphs and alerts on the unit itself.
- Automated triggers – drive any device off temperature, humidity, VPD, CO2 or time of day.
- Data logging – charts and notifications, so a heat spike is something you find out about rather than discover.
- Password lock – stops anyone nudging your settings.
- UK plug, CE compliant.
CTR89A or CTR89Q?
| CTR89A with CO2 Sensor (this product) | CTR89Q Controller only | |
|---|---|---|
| CO2 sensor | Included | Not included |
| Ports | 8 | 8 |
| Trigger on CO2 | Yes | Only if you add a sensor |
| Temp, humidity, VPD, timer | Yes | Yes |
| WiFi, Bluetooth, app | Yes | Yes |
| Best for | Sealed rooms, CO2 supplementation | Standard ventilated tents |
Specification
| Model | CTR89A, UIS Controller AI+ with CO2 Sensor |
| Ports | 8, expandable via UIS splitters |
| Connectivity | WiFi and Bluetooth |
| Display | 4" TFT touchscreen |
| Power | 9V DC, UK plug included |
| Compatibility | All UIS devices: Cloudline, IonFrame, Multifan and more |
| App | AC Infinity, iOS and Android |
| Controller dimensions | 11.4 x 7.6 x 2.6cm |
| Mounting | Magnetic or screw-mountable |
Goes well with
- Climate Sensor AC-SP24 – a second temperature, humidity and VPD probe on a 24ft lead, for reading canopy level rather than wherever the controller happens to hang.
- Hydro Sensor AI+ (AC-HDS3) – puts pH, EC, TDS and water temperature on the same controller, and lets you drive equipment off them.
- Water Sensor (AC-WDS3) – leak detection on the tray. Cheap insurance next to a controller this size.
- UIS Extension Cable 10ft (AC-EXH9) – eight ports is no use if the device is out of reach.
Running a GAS, Hyper Fan or Rhino EC fan?
You will need the Cross-Connector Adaptor Cable plus a Type-A Adaptor to get a non-AC Infinity fan talking to this controller.
Frequently asked questions
Is this a different controller to the CTR89Q?
No. Same 8-port Controller AI+. The difference is that the CO2 sensor is supplied with it, and the controller can then run your fresh air exchange off real CO2 readings.
Can I add the CO2 sensor to a controller I already own?
Yes, the sensor is a UIS accessory and plugs into an existing Controller AI+. Buying the two together here works out cheaper than adding one later, which is the whole point of this version.
Do I need CO2 control if I am not supplementing?
Not usually. A tent on a normal extraction cycle keeps up with what the plants use. It earns its money in a sealed or tightly sealed room, where CO2 is drawn down between exchanges and you would otherwise be guessing. If that is not you, take the controller on its own.
How many devices can it actually run?
Eight directly, and more with UIS splitters. Browse the rest of the range in AC Infinity UIS Controllers.