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Thread: pH Control upward/downward - Abnormal switching

  1. #1
    Join Date
    31.03.2013
    Location
    Seoul
    Posts
    29

    Idee pH Control upward/downward - Abnormal switching

    Hello,

    I have a Profilux Mini WiFi with the latest firmware (1.14).

    I am experiencing something with the pH upward/downward logic that I cannot understand. Here is the issue:

    pH nominal value is set to 6.30, hysteresis to 0.6. My understanding is that ph control upward should switch on when pH drops below 6.00, and pH control downward should switch on when pH is above 6.60.

    The pH in the tank is currently 6.37, and there is a "-" sign on the right of the pH value, and the pH control downward is switched on (the control upward is switched off).

    Few days ago, pH was 6.15 with a "+" sign displayed, control upward was switched on (control downward was switched off).


    Is there anything I am missing?
    Appreciate your help.
    55G Discus Tank. Profilux Mini Wifi.
    Previously owned a Profilux 3ex with a GHL doser and water level sensors.

  2. #2
    Join Date
    12.04.2015
    Posts
    363

    Default

    The + ore - stays until ph= 6.3 ist reached

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