DIY salinity probe?

Discussion in 'Anything DIY Related' started by gmccarthy, 20 May 2013.

  1. gmccarthy

    gmccarthy

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    I've been following Manic's diy controller thread and it all looks awesome. One thing I didnt find an answer to is if anyone has successfully build their own salinity probe?

    I can buy one from Atlas Scientific but it costs around $100 - I'm sure you should be able to build one for a lot cheaper and it will be lots more fun.

    The sensor is just a conductivity probe which measures current between 2 sensors correct?

    Anyone looked at this yet?
     
    Last edited: 20 May 2013
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  3. RiaanP

    RiaanP Moderator

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    Salinity or TDS?
    TDS is the electrical current between two points. Salinity is the light bending through a prism.
    Basically, not 100% correct but yeah, its the basic principle.
     
  4. gmccarthy

    gmccarthy Thread Starter

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    Good question. If I measured the conductivity how would this be translated to a salinity value?

    At the end I want to measure salinity and monitor that the value is constantly 1.025
     
  5. RiaanP

    RiaanP Moderator

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    Not done by conductivity.
    By prism, or what we call a refracto meter.
     
  6. Toolboysa

    Toolboysa Moderator

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    One can use a probe to determine Salinity. Just have no idea how its doneProb with some very complicated maths I would assume

    You get salinty expansion and probe for the reef angel http://www.reefangel.com/products.aspx
     
  7. gmccarthy

    gmccarthy Thread Starter

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    Thanks - interesting link.
     
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