Maintaining a CO2 level between 1000 and 1500 PPM is essential for most plants. The Sentinel CPPM-4 controls carbon dioxide levels with part-per-million accuracy. The dual beam CO2 sensor is the highest tech, most accurate sensor available to the hobby hydroponics industry!

An updated version of the CPPM-1, the Sentinel CPPM-4 CO2 PPM Controller is even more precise and features a ten-year life expectancy. The removable remote CO2 and light level sensor can be positioned inside the growing area with the CPPM-4 unit positioned outside of the grow room. It comes with a 16-foot cord, but can be extended up to 100 feet.

As you would expect from Sentinel, the green LED display on the CPPM-4 is easy to read and provides simple pushbuttons to enter the desired PPM settings and to display the current CO2 PPM reading.

The CPPM-4 can also be connected to other controllers so that the CO2 is disabled (useful when operating exhaust fans), or it can be operated in Fuzzy-logic mode when using compressed CO2, or ON-OFF when using CO2 generators.

CPPM-4 specifications:

• Amps / Volts: 15 amps @ 120 volts
• Min / Max operating temperature: 32 to 120 F
• Min / Max operating humidity: 0-99% RH
• Light Sensor sensitivity: adjustable
• CO2 Measurement range: 0-2500 PPM
• CO2 Accuracy: +/- 75 PPM
• CO2 sensor warm-up time: < 10 minutes
• Computer Interface: Optional RS 232 / 9-pin D-sub
• Weight: 5 lbs.
• Dimensions: 8" x 6.5" x 3.1"
• Life Expectancy: > 10 years

This rugged unit has a weather resistant housing and sealed main controller modules to prevent moisture and debris contamination. Rohs compliant! Carries a Sentinel 3-year warranty.