First program the doser to react to the right sockets, for example if you have a 6 socket power bar you want the doser programmed to react to socket 7 and 8. Follow the programming of the doser found in the manual for this.
it is not wise to control ATO based on pH value at all you could end up with a flood if the pH drops. But for non pH controlled ATO again this is simple
Set for example socket 7 to water 1
go to level sensor input and set up level 1 as you want it to react as ATO, setting your max on times etc etc, now the sensor will turn on socket 7 when it is required in turn this turns on the dosing pump.
Kalkwasser - set socket 8 to pH up
go to pH screen and set your nominal value for pH, when the pH drops the controller will turn on socket 8 and fire the 2nd dosing pump.