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Jaycar pH meter

Discussion in 'Hobby Electronics' started by Clifford Heath, May 22, 2006.

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  1. Anyone know whether this item's any good? Not so much
    how accurate is it, but can it be expected to last a
    while? Anything else I should know? I'm unfortunate
    enough to have a pool to maintain, and anything that
    makes it easier would be welcome. I realise this is
    aus.electronics, not aus.pool.chemistry, but I figure
    folk here shop at Jaycar and are often a cluey bunch,
    so... any thoughts?
     
  2. Rob*

    Rob* Guest

    I think pH sensors may have a finite lifetime. I don't know anything about
    the Jaycar unit but I reckon you might be better off sticking with the
    little (pH/Alkalinity/Cyanuric Acid/Chlorine) dip test strips - $12 for 50
    strips isn't too bad and might be a hell of a lot simpler than stuffing
    about with a pH meter.
     
  3. Yeah, well, so does the sun. Any idea how long?
    Apparently not. The little strips are very inaccurate,
    show multiple different colours on the one tab - none of
    them a very close match to the colours on the container -
    and they can be adversely affected by different water
    conditions unrelated to pH. There's much less "stuffing
    about" just poking a probe in the water, especially if
    you can get repeatable results with one.

    Thanks anyway, I'll try sci.chem.analytical.
     
  4. The lifetime of the device depends on how long the reference liquid
    lasts inside the sensor. A good quality sensor will last you years, if
    treated with care. I am not sure how much the jaycar unit is worth,
    but its probably not going to be a lab grade sensor. However, you may
    find it fits your needs quite well. Buffer sollutions can be had from
    industrial chemists for testing, and you may even find them at your
    local aquarium supplier. I guess you could also take a water sample to
    your pool shop once a year for comparison purposes.

    ITs been a long time since I was in this industry, but IIRC the senors
    I used to buy were shipped with a little snap on cap filled with
    distilled water to extend the life. If the jaycar beast comes with
    such a fitting then keep it fitted, and filled.
     
  5. Actually, the more i think about this, IIRC The reference liquid is
    just a ph neutral liquid. I think lifetime also depends on the how
    long the liquid in the measurment electrode lasts too, which again
    IIRC is just a ph neutral liquid. I went looking for my old
    instumentation books but I cant seem to find them anywhere.
     
  6. John_H

    John_H Guest

    I have no idea what principle the Jaycar meter operates on, but even
    the laboratory grade instruments are high maintenance and prone to
    failure. The glass membrane which forms the half cell is prone to
    both contamination and breakage.

    What have got against good quality indicator papers?
     
  7. Thanks Andy, I got a similar response in sci.chem.analytical.
    Concensus is the cheap meters are erratic when new, and not
    likely to improve with age :).
     
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