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Thread: Programming for Co2

  1. #1
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    Programming for Co2

    I'm running my Apex Classic on a planted tank with pressurized Co2. I'm controlling Co2 on/off based on the pH. But I'd like the on/off pH range to be different at night than in the day. For example, between 11pm and 11am I like the on/off range to be between 6.9 and 7.0. But for the next 12 hours I'd like the on/off range to be 6.7 to 6.8. Is this doable?

  2. #2
    Frequent Contributor zombie's Avatar
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    Yes use two virtual outlets

    CO2day
    If pH < 6.7 Then ON
    If pH > 6.8 Then OFF
    If Time 23:00 to 10:59 Then OFF

    CO2night
    If pH < 6.9 Then ON
    If pH > 7.0 Then OFF
    If Time 11:00 to 22:59 Then OFF

    Solenoid
    Fallback OFF
    Set OFF
    If Output CO2day = ON Then ON
    If Output CO2night = ON Then ON


    Sent from my SM-G965U using Tapatalk

  3. #3
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    Quote Originally Posted by zombie View Post
    Yes use two virtual outlets

    CO2day
    If pH < 6.7 Then ON
    If pH > 6.8 Then OFF
    If Time 23:00 to 10:59 Then OFF

    CO2night
    If pH < 6.9 Then ON
    If pH > 7.0 Then OFF
    If Time 11:00 to 22:59 Then OFF

    Solenoid
    Fallback OFF
    Set OFF
    If Output CO2day = ON Then ON
    If Output CO2night = ON Then ON
    Outstanding!!! THANKS!!!!!!!!

  4. #4
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    Quote Originally Posted by zombie View Post
    Yes use two virtual outlets

    CO2day
    If pH < 6.7 Then ON
    If pH > 6.8 Then OFF
    If Time 23:00 to 10:59 Then OFF

    CO2night
    If pH < 6.9 Then ON
    If pH > 7.0 Then OFF
    If Time 11:00 to 22:59 Then OFF

    Solenoid
    Fallback OFF
    Set OFF
    If Output CO2day = ON Then ON
    If Output CO2night = ON Then ON


    Sent from my SM-G965U using Tapatalk
    New to CO2 injection and my Apex - but would program turn on CO2 when pH is less than 6.7 and then off when greater than 6.8?

    Just curious because I thought increased CO2 levels would actually lower the pH level.

  5. #5
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    I mixed up my signs.
    Good catch!


    Sent from my iPhone using Tapatalk

  6. #6
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    Whew

    So glad you responded - I have been staring at this code all day thinking I was doing something wrong.

    Just installed my CO2 and Apex on my 75G community tank - just trying to get a little more green going by adding CO2.

  7. #7
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    Using an Apex to control CO2 by monitoring pH is the way to go. Enjoy your tank!!!!


    Sent from my iPhone using Tapatalk

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