A solenoid-equipped regulator was required so CO₂ could be placed under automated control rather than run continuously or switched by hand.
What I've learned
·Because carbonate hardness is kept at or near zero, the pH/KH table is not usable here, so CO₂ is inferred from the pH drop off the morning degassed baseline instead.
·Keeping the hard limits on the controller rather than in software means a stuck script cannot over-gas the tank.
Installation
Not yet documented.
Configuration
·Solenoid switched by a controller outlet
·Automated on a fixed daily window, deliberately not closed-loop on pH
·Hardware safeties: pH floor, time window, leak sensor
Maintenance
Not yet documented.
Known limitations
Not yet documented. Absence here means nothing has been written down, not that there are none.
Controller integration
Solenoid driven from a controller outlet (CO2) via a virtual output, with a pH floor, a permitted time window and a leak sensor enforced on the controller itself.
Current observations
·Automated on a fixed daily window from a controller outlet. Left scheduled rather than closed-loop on purpose: at near-zero KH the relationship between pH and dissolved CO₂ is complicated enough that the curve is used to tune the schedule rather than to drive the solenoid directly.
What this item is doing now, as distinct from what has been learned over time.
Maintenance history
No service dates recorded yet. Scheduled replacement applies to consumables; this item is tracked by condition instead.