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How Do You Measure ORP?

Discussion in 'Electronic Basics' started by Ricky Spartacus, Oct 30, 2003.

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  1. How is the level of the Oxidation-Reduction Potential measured using
    an osciloscope? Is there an easy way to see if a glass of water has
    more negatively charged electrons instead of positively charged

    I'd like to know how long a negatively charged glass of water lasts.
  2. Oxidation reduction potential, pH and ion selective measurements are
    all related in that that they use chemical cells with selective
    membranes to form a cell that produces a voltage related to a chemical
    property of a solution. You might do a google search for some of the
    key terms (perhaps with the word 'tutorial' added to learn more about
    how these work. As it is, you question doesn't quite make sense.
  3. Baphomet

    Baphomet Guest

    Positvely charged electron? I don't think so. There can only be less or more
    of the negative kind. Using a scope would be overkill (and probably
    ineffective in any event) because of the static nature of your measurement.
    Use a galvanometer.
  4. Maybe he is playing with antimatter? ;-)
  5. Why would you play with that stuff? Do you work for Roto-Rooter?
  6. Baphomet

    Baphomet Guest

    Much better than Dark Matter ;-)
  7. How is the level of the Oxidation-Reduction Potential measured using
    I was fed wrong information? This website says free radicals are
    positivly charged. Find `positively charged` at this site.
    Okay, I hope my analog MM goes below - 400mv.
  8. How is the level of the Oxidation-Reduction Potential measured using
    Just thought that a scope is a sensitive equipment that could detect
    changes in the amount of negatively charged water molecues. Also
    thought it's just as easy as dipping probes into the water.

    The device you pointed out seems to require a dedicated instrument. I
    thought I could just stick probes into an orange and get how much
    negative ORPs is in there. Guess it's not the same science experiment
    as in grade school. Will google again. Thanks.
  9. If you are trying to generate DC from dissimilar metals and an acidic
    fruit, you can see that with a scope or meter.
  10. GrimReaper

    GrimReaper Guest

    I run a lot of Salt water marine systems. On the Coral grow out tanks I
    measure ORP (Oxidation reduction potential) Not sure if this is what you are
    talking about. My 'Parent' Coral tank is currently reading 398 mV. I use a
    ORP meter to measure this. It is German and is supplies by Aqua-Medic
    Hope this helps

  11. Baphomet

    Baphomet Guest

    Ricky -

    It's kind of like what's referred to as a hole in solid state physics, i.e.
    a place where an electron was but no longer is. A hole isn't really
    positive, it's just less negative. There are positively charged "electrons"
    called positrons, the anti-particle to electrons; don't try crashing one
    into the other at home unless you happen to have a particle accelerator in
    your basement workshop, however.

    One of my favorite quotes by Bertrand Russell about pure mathematics (and I
    only bring it up in passing because I am re-reading "The World of
    Mathematics" by James R. Newman is "...mathematics may be defined as the
    subject in which we never know what we are talking about, nor whether what
    we are saying is true." ;-)
  12. How is the level of the Oxidation-Reduction Potential measured using
    I understand clearly now. Comparing it to a hole makes sense.
  13. I run a lot of Salt water marine systems. On the Coral grow out tanks I
    This really helped. I can get an ORP meter for a lot less than I
    thought. If all I need is to measure the ORP, could I just buy a probe
    and hook it up to any generic meter capable of measuring -400 to + 400
  14. Sixty4

    Sixty4 Guest

    Yes you were fed wrong information. The site you refer to is full of
    errors. It is a mix of science and pseudoscience (garbage inteneded to
    sound scientific) with the sole aim of selling products. I hope you aren't
    about to spend lots of money based on something you read on this site.

  15. GrimReaper

    GrimReaper Guest

    Sorry Ricky can't help there. These guys here have just taught me how to
    connect up LED's ;-))
    I know that pH and ORP probes produce mV but do not know if my ORP meters
    mV are 'real' mV. i.e. my 404mV measured today really is 404mV. Hope that
    last bit makes sense.

  16. Baphomet

    Baphomet Guest

    Glad it helped Rick :)
  17. I was fed wrong information? This website says free radicals are

    Radicals are not charged at all (ions are). Simply put, radicals are
    unstable molecules, which quickly react with their environment and hence
    can do damage to living cells.

    Oxidation/reduction (redox for short) potential (again very simply put)
    referes to the ratio of oxidising and reducing compounds in a sample.
    Water from a mountain stream will contain a lot of dissolved oxygen
    (which is an oxidising molecule), but little organic impurities. Sewage
    as the opposite extreme will have a lot of impurities (which are
    reducing), but little if any oxygen. Thus you can learn something about
    the purity of water by measuring redox potential. This is done by
    holding a special electrode into the water and measuring the voltage
    between its two poles (which usually will be in the range of -2..+2 V)
    with a milli-voltmeter. The meter must have a high input impedance, as
    the voltage across the electrode would drop if any current were taken
    from it.

    For suppliers, check, or general laboratory
    suppliers like Fisher, Cole-Parmer or BDH. Good instruments can measure
    redox potential, pH, oxygen concentration and temperature, and have a
    rugged design for outdoor use.
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