Converting EC to PPM

Discussion in 'Hydroponic Cultivation' started by chopstick, Jul 9, 2003.

  1. chopstick

    chopstick Chilled out

    I read that to convert EC to PPM, multiply it by 650. At the moment I'm unable to locate a TDS meter without mail ordering, so was wondering if an EC meter would do the trick with the conversion?
     
    chopstick, Jul 9, 2003
    #1
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  2. Useless

    Useless Diogenes Reincarnate

    Choppy, what you are doing is converting EC (electro-conductivity)to TDS (Total Disolved Solids). TDS = PPM.


    There are a lot of different conversion factors for this. The one I use with no problems what so ever, is from the University of Minnesota Biology Department.


    The factor is as follows:


    For any EC reading .99 or below, multiply by 680 for TDS.


    For any EC reading 1.0 or above, use a factor of 700 for TDS.


    Note, this is for EC meters with a 1.0 scale. Some meters have a 10.0 scale, some a 100.0 scale, so do the appropriate math, i.e. for a 10.0 scale only multiply by 68 or 70, for a 100 point scale, mulitply by 6.8 or 7.0.


    To answer your ?, an EC would work fine.


    To make a long story short...(too late!)
     
    Useless, Jul 9, 2003
    #2
  3. hydro convert

    hydro convert Developed Alternating Nodes

    Nice post, good information to have.
     
    hydro convert, Jul 9, 2003
    #3
  4. Useless

    Useless Diogenes Reincarnate

    I wont usually nominate my own posts for the FAQ unless I KNOW its a fact, scientific evidence and all. This one seems appropriate. Mods?
     
    Useless, Jul 9, 2003
    #4
  5. hydro convert

    hydro convert Developed Alternating Nodes

    I would second that, if it matters [​IMG]. It would be a good idea to have data we could reference.
     
    hydro convert, Jul 9, 2003
    #5
  6. Useless

    Useless Diogenes Reincarnate

    we should get everyone to contribute to a spreadsheet of data, for lighting, CO2, EC/TDS, Ph, etc. etc... a simple chart, could even include graphs.


    would be a great reference tool for anybody.


    Again, Mods? plea to webby? What do you folks think?
     
    Useless, Jul 9, 2003
    #6
  7. hellostupid

    hellostupid Stupid Iz. Stupid Duz.

    :biggrin:


    I concur:)


    :affro:


    :viking:
     
    hellostupid, Jul 9, 2003
    #7
  8. Administrator

    Administrator Administrator

    Use? Would you rather I move this particular thread or do you wish to make a more professional FAQ post? If you wanna doctor it then send me a copy via PM and I can add it for ya.
     
    Administrator, Jul 9, 2003
    #8
  9. HappyJay

    HappyJay Red Eyed Jedi

    Here is a fair bit of information on EC and TDS measurement that I found over at OG. It is pretty thurough so if you feel, take a peek over at http://www.overgrow.com/growfaq/741
     
    HappyJay, Jul 9, 2003
    #9
  10. chopstick

    chopstick Chilled out

    Yes TDS is what I meant to say, I guess many things even Co2 are measured in PPM. That helps a lot, thanks Useless :smile:


    There should definitley be something on this in the FAQ it's great info.


    (Edited by chopstick at 7:17 pm on July 9, 2003)
     
    chopstick, Jul 9, 2003
    #10

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