As an Atmos tech, I struggle most shifts to set up a fire suppression system (using cold CO2) in the small maint rooms between sci-chem and toxins mixing. I find it to be an effective deterrent to plasma fires as long as either the AI or myself is manning it. A few additional pipes would go far into making it an effective starting set-up.
Still trying to find out if there's a way to automate it, I'm trying playing with the air alarm settings to see if there's some way to make the pumps turn on automatically over a certain temp threshold, but I'm having no luck. Throw in greyshirts with a flair for opening random canisters and you have one angry Atmosan. >:
The attached image is my typical set-up. The light blue are the tanks on connectors, the red lines the pipes, the green marks are air injectors. I'd generally throw plasma glass windows with girders in them in the walls for easier monitoring. After setting it up I'd ask the AI to check the functionality of the pumps so they know what's up.