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Is there a way of measuring CO2 electronically?

Discussion in 'CO2 Enrichment' started by Anka, Jun 6, 2012.

  1. Anka

    Anka Lifetime Members
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    How can I measure CO2 electronically?

    I am colourblind and cannot do the colour indicating tests.

    Cheers

    Andrew
     
  2. Tom Barr

    Tom Barr Founder
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    Yes, mostly via pH/KH or a KH reference cell, then the pH/KH chart.

    Or watch close and slow and progressively adjust.
     
  3. Anka

    Anka Lifetime Members
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    Thanks Tom - do you know a way of digitally monitoring or recording water hardness in the form of kH or gH? Or any other form of hardness that can be recorded and then converted to gH and/or kH?
     
  4. Anka

    Anka Lifetime Members
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    I ask because I am buying a photometer to determine the colours using light spectrum analysis - but it doesn't test hardness.
     
  5. Tom Barr

    Tom Barr Founder
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    Several companies make hardness photometers.
    Be good to have on hand.

    Hanna makes a multi meter that does that and alkalinity, NO3, PO4, K+, Fe etc.

    Not sure you need all that, just KH and GH, and pH meter.
     
  6. Anka

    Anka Lifetime Members
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    The one I'm getting is a multiparameter photometer, measuring:
    - pH
    - Nitrate
    - Nitrite
    - Iron
    - Copper
    - Chlorine
    - Ammonia
    - Phosphate
    - Dissolved Oxygen

    but no hardness >.
     
  7. Tom Barr

    Tom Barr Founder
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  8. Anka

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    Hi Tom,

    I'm getting this: http://www.hannainst.com.au/learn_more/i:HI+83203

    It's a bit expensive ($750 for unit and $700 for reagents) but it does everything.

    No need for pH as I have a probe that measures that.

    Can alkalinity be converted to kH?

    Is total hardness equal to general hardness? (or can be converted)

    That alkalinity photometer says it is for marine aquariums - so I will call Hanna and asked them if it is appropriate for FW. Or do you know for a fact it will be fine for FW?

    Cheers
     
  9. Tom Barr

    Tom Barr Founder
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    Alkalinity is KH as far as we are concerned, in marine systems and few others, borate contributes to the alkalinity, but for FW, it's all KH.
    Poly Phosphates can influence KH in FW also, these are sometimes used to lower pH but they do not add any CO2 obviously.

    The Hanna unit you are looking at is a bit pricy. So are the reagents.
    I'd just get a decent NO3 test kit, KH, and pH.

    I hardly ever test anything anymore.

    Most is done by plants, algae, fish appearances/behavior.

    Light I'll test more than anything these days.
    Then CO2 very carefully.

    Nutrients, not at all.
     
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