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Thread: EC Meter Resolution

  1. #11

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    Quote Originally Posted by Deku Nut View Post
    It says EC on the meter, it has multiple modes. Is it not the same?
    I have been using it all through my coco grow.
    Attachment 411164
    Like I say, I'm being a pedant

    So long as you understnd the relationship between the numbers & the solution, there is no issue
    It's Not What You Know, It's What You Can Prove

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  3. #12

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    Quote Originally Posted by M_C View Post
    So pedantically, you're saying that his meter is not an EC meter because it measures EC at .6 ums/cm rather than 600 mm/cm?

    Cheers


    "The footsteps of the farmer is the best fertilizer."

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  5. #13

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    Quote Originally Posted by barney_b View Post
    So pedantically, you're saying that his meter is not an EC meter because it measures EC at .6 ums/cm rather than 600 mm/cm?

    Cheers
    I did say I was being a pedant

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  7. #14

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    Quote Originally Posted by M_C View Post
    I did say I was being a pedant
    Dammit M_C!!!

    Not enough coffee this morning for these mental gymnastics.

    Cheers brother,
    B

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  9. #15

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    I've approved links for Daveb22 to link to charts on his own website. There should be no advertising links or links to sites not his own.
    "If science can't be questioned, It's not science anymore"

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  11. #16

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    Quote Originally Posted by barney_b View Post
    What is EC and How Is It measured?
    Electrical conductivity or "EC" is a measure of the “total salts” concentration in the nutrient solution (drip, slab or drain). It is expressed in milliSiemens per linear centimeter (mS/cm) or microSiemens per linear centimeter (mS/cm) where 1mS = 1000µS.

    Unit
    The EC can be expressed using a number of different units, but the typical unit is siemens per square meter per mole (S/m2/mole) or millisiemens per centimeter (mS/cm). The mS/cm unit is generally used in Europe as a guide to concentration of nutrients in water. In North America, the conductivity is converted into a count of the ions in the water using parts per million (which can also be given in many units including ppm, mg/l etc.). This is done by converting the EC into a value based on knowing the content ions of the solution. Fortunately, there is a fixed calculation for the relationship between these units, which is given in the table below.


    Uh uh.
    Perhaps a typo in the text? The same unit "mS/cm" in the first paragraph is used for both milliSiemens and microSiemens.

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  13. #17

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    Quote Originally Posted by mpsj View Post
    Perhaps a typo in the text? The same unit "mS/cm" in the first paragraph is used for both milliSiemens and microSiemens.
    I think you're correct. Typo.

    Cheers

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  15. #18

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    Quote Originally Posted by barney_b View Post
    Dammit M_C!!!

    Not enough coffee this morning for these mental gymnastics.

    Cheers brother,
    B
    Click image for larger version. 

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  17. #19

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    So I take it the jist of all that is:

    The Vivosun meter reads in mico-siemens (?S) and the PPM reading is on the Hanna (500) reference scale so,
    When in EC Mode, if that meter reads 968 ?S, you convert that 968 ?S value to milli-siemens (mS) by multiplying 968 ?S by 1000 to get 968 mS (which is normally referred to as an EC value of 0.968ec).
    You can then convert to ppm by multiplying the 968 mS (milli-siemens) value by .5 to get 484ppm.

    That is why the meter in EC mode would read 968 ?S/cm (which is also = 0.968 mS/cm) and 484ppm when in PPM Mode

    However, for those who like simple things, with that meter, if you drop all the ?S/mS reference confusion and simply remember:

    In EC mode:
    A displayed value of 1000 = 1.0ec. A displayed value of 500 = 0.5ec.
    You can simply take the displayed value (eg: 968) and multiply it by .5 to get the ppm value (eg: 968 * .5 = 484ppm)

    In PPM Mode:
    You can simply convert the PPM value (eg: 484) back to EC ?S/cm by dividing the displayed value by .5 (484/.5 = 968?S)
    You can simply convert the PPM value (eg: 484) back to EC mS/cm by dividing the displayed value by 500 (484/500 = 0.968mS)

    Dave

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  19. #20

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    EC is how easy it is to conduct electricity between the 2 ( or more ) electrodes on the meter via the medium you are testing.

    The more salts, the more conductivity ( the less resistivity )

    Takes me back this stuff love it

    You literally cant get electricuted, or feed plants with EC 0 water.

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