View Full Version : ac3 co2 question???
mikedelgado
03/26/2008, 03:18 AM
I would like my co2 to come on between the hours of 10:00am to 5:30pm. In that time period I want it to only come on when my ph is more than 6.5 and off when it is less than 6.4. This does not seem to be working for me, I have messed something up. It is coming on at night too. Do I need to put if ph is (> <) between the time on and off, or did I just do it wrong?
If Time > 10:30 Then CO2 ON
If Time > 17:30 Then CO2 OFF
If pH > 06.50 Then CO2 ON
If pH < 06.40 Then CO2 OFF
Thanks for any help that you can give me!!!!
60Cubed
03/26/2008, 06:24 AM
I think you are going to have to turn off your feed pump when you want the reactor time off. You are allowing for two seperate on/off commands. The way you have it the Co2 will come on with the time command but also every time the ph is above 6.5. If you shut off the feed pump this will stop your affluent drip to the tank. I don't know if you can command it to do what you are asking.
dougchambers
03/26/2008, 08:15 AM
Mike,
There are a number of ways to do this, but I think you need to change up your sequence a little bit and create a dummy timer for your DAY period. I'd also add a bounce timer for your CO2 solenoid to keep it from chattering.
Try this;
If Time > 10:30 Then DAY ON
If Time > 17:30 Then DAY OFF
If pH > 06.50 Then CO2 ON
If pH < 06.40 Then CO2 OFF
If Timer DAY = OFF Then CO2 OFF
Max Change 005 M Then CO2 OFF
You could also do something like this;
If Time > 10:30 Then DAY ON
If Time > 17:30 Then DAY OFF
If Timer DAY = ON Then CO2 ON
If pH < 6.40 Then CO2 OFF
If Timer DAY = OFF Then CO2 OFF
Max Change 005 M Then CO2 OFF
-Doug
mikedelgado
03/26/2008, 09:31 AM
the first one sounds like it would work. i have a question about the max change 005 m then co2 off, what does that mean??? i know that is what i need but i don't understand how it works.
thanks again for all of your help!!
oh, i can't turn off my feed pump due to the fact that it is my main pump and runs everything else in my tank.
dougchambers
03/27/2008, 11:20 AM
Max Change 005 M Then CO2 OFF will keep the CO2 off for a minimum of 5 minutes. It will help keep from chattering your CO2 relay as the pH hovers around your set point.
-Doug
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