Refractometer readings

Discussion in 'Test Kits, Controllers, Reactors and Dosers' started by Gesiggie, 28 Oct 2012.

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  1. Gesiggie

    Gesiggie Challenge accepted

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    Hi people, a question to all the chemistry guys.
    I've got two refractometers,
    A) is marked from 1.000-1.070 which I assume is specific gravity.
    B) is marked from 0-28 and is indicating that it reads salinity.
    Both units are ATC models.
    My question is now this...
    When I test the same water with both refracto's, A gives a reading of 1.025, and B gives a reading of 5.
    How do I interpret these readings?
    I am thoroughly confused :)
    Thanks!
    Img is sample of the scale for B
    ImageUploadedByTapatalk HD1351443856.340586.jpg

    ImageUploadedByTapatalk HD1351443856.340586.jpg
     
    Last edited: 28 Oct 2012
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  3. Quintin

    Quintin

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    Hi there bud.
    I dont think you have the correct refractometer there....
    In ppt 35 is roughly 1.026, so I dont think you have the right calibration on the one you got from China.
    Remember refractor meters are not just only used for salinity.
    You can get specific ones that measure other things as well....
     
  4. Albert Terego

    Albert Terego

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    Refractometer B could be reading salinity in % - IMO not sensitive enough.
     
  5. Quintin

    Quintin

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    Dont think t is percentage.
    When I test the same water with both refracto's, A gives a reading of 1.025, and B gives a reading of 5.

    1.025 is not 50% salt water....
    seawater -- Britannica Online Encyclopedia
     
  6. Albert Terego

    Albert Terego

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    [​IMG]
     
  7. Quintin

    Quintin

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    Ha,ha,ha
    You win. :thumbup:
     
  8. Albert Terego

    Albert Terego

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    Still doesn't explain the differences in readings, but one of the refractometers is likely wrong (my guess would be B)
     
  9. Gesiggie

    Gesiggie Thread Starter Challenge accepted

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    Thanks Quintin, Albert
    According to the website, refracto B is specifically to measure the concentration for salt water and brine...
     
  10. 459b

    459b Moderator MASA Contributor

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    Is refractometer b perhaps measuring in Brix?
     
  11. Gesiggie

    Gesiggie Thread Starter Challenge accepted

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    What on earth is that??
     
  12. viper357

    viper357 Admin MASA Contributor

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    Easy to solve this, take the one that reads from 0-28 and gooi it in the bin, problem solved. :p
     
  13. Gesiggie

    Gesiggie Thread Starter Challenge accepted

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    Nope, rather use it as paper weight, then it at least got some value:)
     
  14. 459b

    459b Moderator MASA Contributor

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    Brix is a measurement used in the food industry to show sugar content. Some refractometers are marked in brix and have a range from 0 to around 30
     
  15. RiaanP

    RiaanP Moderator

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  16. Gesiggie

    Gesiggie Thread Starter Challenge accepted

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    Ah, ok.
    I am getting more confused by the minute!! From wine, to beer, to sugar... I should have gone into the food industry ;)
     
  17. Quintin

    Quintin

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    You also get for brake fluid, ext,ext

    gainexpress.com
     
  18. Nemos Janitor

    Nemos Janitor

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    Yes that scale is in Brix.

    For Salinity S=35 refers to a brix of 6.57% refers to a SG of 1.026 @ 20c

    The instrument needs to be calibrated at 20c. (temperature of the instrument) use RO water and set the instrument to zero. All readings will refer to a BRIX at 20c

    Brix conversion to SG @20c

    1.014= 3.57
    1.015= 3.82
    1.016= 4.08
    1.017= 4.33
    1.018= 4.58
    1.019= 4.83
    1.020= 5.08
    1.021= 5.33
    1.022= 5.57
    1.023= 5.82
    1.024= 6.07
    1.025= 6.32
    1.026= 6.57
    1.027= 6.81
    1.028= 7.06
    1.029= 7.3
    1.030= 7.55
     
    Last edited: 29 Oct 2012
  19. Gesiggie

    Gesiggie Thread Starter Challenge accepted

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    Thank you NJ. Where did you get that conversion scale?
    Also, both Refracto A and B is ATC, can I thus for future readings just test the tank's water at its normal temp of around 25C?
    Once both refractos are recalibrated, is B then supposed to read at around 6.3?
    And lastly. Why on earth would one use such a scale (as refracto B) for seawater? I have never heard about brix until yesterday...
     
  20. rakabos

    rakabos

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    Same here, brix ??! what the....
     
  21. Nemos Janitor

    Nemos Janitor

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    Here is quite a nice explanation on the Brix scale.

    http://en.wikipedia.org/wiki/Brix
     
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