Apex dos coding

[Heres_doe_]

How can I tell my dos to turn off for 4 hours if ALK gets higher than 9.2?

 

[reefing102]

I’m just taking a stab in the dark here, but perhaps page 8/9 here will help? It’s for PH but I would think it may work if changed to Alk

https://www.neptunesystems.com/downloads/docs/DOS_manual.pdf