PH meter for Co2 system..need to know if I set it right

[Huro]

So I finally got the time tonight to hook up my Co2 system and I have a question about my Milwaukee MC122 ph meter. I set my dial to 7.5 and flipped my switch to activate when below 7.5 , turning on my Co2. Did I set this correctly or should I have flipped the switch to activate above 7.5, sorry the Milwaukee manual was not clear on this point. Thanks

 

[Huro]

Ok so got some coffee went back and hit the notes, ok based on this chart my KH when last tested was 3 degrees so ideally with Co2 I should be shooting for a PH of 6.5 as Co2 lowers PH.. Therefore I went back reset meter to 6.5 and have it set to turn on Co2 anytime my Ph rises above this value.....This correct?

 

[Huro]

Ok just in case someone stumbles across this thread with the same question I had, the second post is spot on. It has nearly been 24 hours and drop checker has been in the green, plants and fish are doing great, although I did notice a one point increase in KH so readjusted Ph to 6.6.