The C.A.P. CO2-4e has 4 sequence timers for perfect coordination of ventilation and the CO2 enrichment - all in one unit. It separately controls the temperature, humidity and CO2 levels. Built-in photocell ensures CO2 valve or generator is only active during the day when the HID lights are on. 

It has two timers that are used to add just the amount of CO2. One timer of the CO2-4e controller manages the length of time the CO2 is released and the other controls how often the CO2 is released. A Cycle Timer then lets you set how long the supplemental CO2 is kept in the growing area before being exhausted. When the cycle ends, the CO2-4e turns ON the exhaust outlets and starts the Exhaust Cycle Timer, which controls the amount of time the exhaust fans will run. Very efficient!

The CO2-4e also features independent temperature and humidity controls which will disable CO2 injection if the temperature or humidity levels specified are exceeded, activating an exhaust outlet which will control ventilation equipment (air conditioner, exhaust fan, etc.). External remote temperature probe is very reliable and can be placed up to 30” from the unit.

CO2-4e controller has three indicator lights to verify Exhaust, CO2 ON and PPM levels.

Specifications:

Main power voltage: 120 volts
Maximum amperage: 15 amps
Temperature control range: 50-115° F
Temperature operating range: 32-120° F
Relay operating life: 100,000 electrical
Humidity control range: 20 - 80%

The CO2-4e is dependable and is warranted against defects in workmanship and parts for THREE Years!

More info (PDF format)