Help with setting two limits for ph

[Cgreene]

I have a Profilux 3 with 1 powerbar. I have my programable logic set for a ph of 8.5 to turn my topoff off which doses kalk. I also a calcium reactor and would also like to set a bottom limit ph of 7.9, to turn the reactor off. Can you set both a top limit and a bottom limit for ph?

Casey

 

[AQD_ottawa]

Set your nominal value (your switching point) and then set the hysteresis.

so if your nominal value was 7 and you want it to switch at the lower end of 6.6 then set the hysteresis at 8.

Now instead of the nominal value being the switching point at 7 it will switch at the lower end at 6.6 and the higher end of 7.4

 

[Cgreene]

So if i want my topoff to turn off at a ph of 8.6 or above, and my Calcium Reactor to turn off at a ph of 7.9 or below. What would I set my nominal value to and hysteresis?

My topoff is "Timer 2" and is set to topoff every 3 hours. So do I set a programmable logic- input1 is "Timer 2" and input2 is "ph-value 1 Increase"-----Is this correct?

Then my Ca reactor is "programable logic 1" (should it be something else? I didn't know) I want it to run all the time unless ph drops below 7.9. So do I set a programmable logic- input1 is "programmable logic 1" and input2 is "ph-value 1 Decrease"----is this correct?

Casey

 

[AQD_ottawa]

PL is not my strong point, Boboxx can you help on this one please?

 

[unbreakable]

is hysteresis like, lets say nominal value is 7 Ph then set hysteresis of .6 so the lowest it goes is 6.4 and the highest is 7.6? I have my temperature in this matter so my heater and fans keep temp close to 78 degrees

 

[Cgreene]

and its not to turn my Ca reactor off, its to turn the CO2 off. My bad.

Casey

 

[Cgreene]

anybody?