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Entry Date
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Nick Name
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Location
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Wednesday, May 01, 2019
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Matt D.
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Connecticut
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Entry 60 of 210 |
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Sentinel CPPM-4i CO2 Controller
There are many different brands of controllers out there and this is just one example. The goal is to find one that has “fuzzy logic” as this will allow for a more precise control of the carbon dioxide levels and reduce the amount that is wasted.
This controller will not be used for the season and is actually discontinued but it does have a nice feature that allows the grower to program the time and duration of carbon dioxide enrichment. It is important to ensure that enrichment only occurs during times of light exposure to the plants as this is when photosynthesis is taking place. Night time enrichment is simply a waste.
Other controllers use a photocell to determine “day” and “night” but the Sentinel controller allows the grower to select the specific time it will turn on and off. This can be advantageous, because if later in the day there is increased venting you may want to select the control to turn off to prevent costly carbon dioxide from being wasted.
With the grow light also active this controller has been programmed to come on at 0400 and run until 1700 and maintain a carbon dioxide level of 900ppm +/- 50 ppm. However, as the season progressed the run time was cut down to 0700 to 1300 with the same 900ppm set level.
This controller also provides a live readout of the time and ppm level. As can be seen in the image everything is operating as planned and the plant seems to be responding even at this early stage of development.
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