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Thread: Can Apex read negative ORP values (No3 reactor)

  1. #1
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    Can Apex read negative ORP values (No3 reactor)

    Pretty comfortable with my ORP probe in my display, it reacts as it should etc. In a bid to start to automate my No3 reactor i want to set it up in the normal way with an ORP probe reading the values inside the reactor that then triggers a water feed (peri pump) Switched over the ORP probe to my reactor and as expected the values soon dropped to zero, but not lower and after quite some time when i would of expected the values to actually be in negative they are still at zero and i wondered if they are indeed below zero but Apex some how could only display the lowest value it has ie ZERO.

    Does anyone know if Apex can display negative ORP values ? I need a trigger point at -170mv

    Thanks

  2. #2
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    Think I'm answering my own questions here

    https://forum.neptunesystems.com/sho...e-ORP-readings

    An old thread (2014) suggests that negative values are ignored by Apex but a potential hack can be to reverse the wiring polarity.

    Anyone know if Apex has been updated to overcome this yet ?

  3. #3
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    This may be a good and simple solution to switch over the polarity:


  4. #4
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    Did you see the use of the connector work??

    Just wondering if the use of the reverse polarity connector allow you to read negative ORP readings in your NO3 Denitrator?? I am planning on getting my Sulphur Denitrator fired up this week and was wondering if you have any insight or success reading negative ORP readings in fusion dashboard. Let me know please and thank you in advance.

  5. #5
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  6. #6
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    Do you have the link for the BNC Banana Adapter

    Quote Originally Posted by SuncrestReef View Post
    just wondering if you have the link to the BNC banana adapter or maybe some type of instructions for soldering the cables to convert the cable into reverse polarity??

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