Sorry - this product is no longer available

Co2 Gas Detection Sensor

Hydroponics is a method of growing plants using mineral nutrient solutions, in water, without soil. Terrestrial plants may be grown with their roots in the mineral nutrient solution only or in an inert medium, such as perlite, gravel, mineral wool, or coconut husk
our new hydroponics site Shop our new Hydroponics Store for lower prices and our Deal of the Day items! ( note, copy the stock number of the item you are looking for and paste in the search box on our new site to go back to this item.)
volume discounts available
$75 min order on all hydroponics
huge selection - everything you need
Free Shipping Additional shipping charges may apply on large / heavy items Hydroponics Shipping Details
$296.94
SKU: CAPPM4
Delivery date Usually ships within 3 days
+ -

The PPM-4 is the simplest, safest and most affordable CO2 controller available today... from any manufacturer. Perfect for controlling LP or natural gas generators with PPM accuracy.



  • The PPM-4 is a two-piece controller that includes a wall mounted infrared sensor with a 10 ft. cord and a plug-in pass-through controller/power supply.

  • The plug in control is designed to be electrically safe.

  • Designed specifically to control the carbon dioxide level in your grow environment with PPM accuracy and is easy to use out of the box due to its easy to read 3 LED interface.

  • Switching set point factory set to 1450 PPM with 50 PPM hysteresis/dead-band.

  • Calibration couldn't be easier. Simply step outside and press a button.

  • The PPM-4 is easily mated to any 120 volt valve or CO2 Generator with a simple plug in device.


The PPM-4 is the simplest, safest and most affordable CO2 controller available today... from any manufacturer. Perfect for controlling LP or natural gas generators with PPM accuracy.



  • The PPM-4 is a two-piece controller that includes a wall mounted infrared sensor with a 10 ft. cord and a plug-in pass-through controller/power supply.

  • The plug in control is designed to be electrically safe.

  • Designed specifically to control the carbon dioxide level in your grow environment with PPM accuracy and is easy to use out of the box due to its easy to read 3 LED interface.

  • Switching set point factory set to 1450 PPM with 50 PPM hysteresis/dead-band.

  • Calibration couldn't be easier. Simply step outside and press a button.

  • The PPM-4 is easily mated to any 120 volt valve or CO2 Generator with a simple plug in device.