Just finish charging my four CO2 containers, lets talk questions about CO2

Well, ive been using co2 containers to add co2 into the air for a while in order to create a better condition to my plants, i think the proper concentration of co2 is 1200ppm. Now, id like to introduce my method about using co2 to you guys, im glad to have a conversation with all of you, so feel free to point out if there are any defects in my design or shoot me some questions and i will try my best to answer anything i know. The first thing thought about is that how to utilise the co2 automatically, to achieve this purpose i really spent a lot. First of all i bought a co2 detector within a relay, when it detects the concentration of co2 in the air is higher than 1200ppm it would shut off the power. And then i bought an eletronic valve which cooperates the detector well, when the power is off that the valve shuts. The co2 system in my tent works well so far, i will post some pics blow, lets see guys!

Today i went to a gas factory to charge my containers, where is as beatiful as these pics shown thats the reason why i also posted the pics of the factory, i really like the atmosphere there, peaceful and interesting!