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Thread: Solenoid valve programming

  1. #1
    Regular Vistor
    Join Date
    Aug 2017
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    Pacific
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    17

    Solenoid valve programming

    Looking to use a solenoid valve to turn off when it reaches a certain PH level but turn back on after a few minutes to essentially check and turn off again if necessarily.
    Figure this may reduce wear and tear on valve and reduce CO2 media consumption a bit.

    What I think would work but please correct me if wrong
    Fallback OFF
    If PH>8.X Then OFF
    Defer 005:00 Then ON

    Thanks
    Lawrence



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  2. #2
    Frequent Contributor zombie's Avatar
    Join Date
    Dec 2013
    Location
    Denver, CO
    Posts
    7,508
    It's best to do hysteresis with CO2 solenoids or they will burn out pretty quick. Better to do something like this.

    Fallback OFF
    If pH > X Then ON
    If pH < Y Then OFF

    You might be an engineer if...You have no life and can prove it mathematically.

  3. #3
    Regular Vistor
    Join Date
    Aug 2017
    Location
    Pacific
    Posts
    17
    Thanks. I was thinking of extending the defer time to 15 min possibly just to avoid burning out the solenoid valve for that reason. I am just concerned about the yo-yo effect of off/on depending on how fast it gets to the upper/lower ranges
    especially on the low side of the PH range between midnight and 11 am when the lights are off.



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