Hi all, we recently bought a Hamilton Beverly portable DO meter. We've already noticed that the unit needs to be calibrated much more than every few months like Hamilton says.
But the biggest question I'm having relates to my dissolved oxygen levels in pre fermented wort. We took a reading the other day and it read >27 ppm. baffled by the number I measured tap water directly afterwards and got 27 ppm again. Fermentation went fine like it always does. Then next batch we calibrated with compressed air before taking a reading and got 27 ppm again, then measured tap water at 24 ppm this time. Is this even possible?! I always understood the theoretical maximum solubility of water being less than 14 ppm?
We oxygenate through a 8 inch carbonation stone with pure welding grade oxygen from prax air, at 2 LPM for a 30 minute transfer on a 10 bbl batch. The DO reading was taken directly after knockout was complete from my sample valve.
But the biggest question I'm having relates to my dissolved oxygen levels in pre fermented wort. We took a reading the other day and it read >27 ppm. baffled by the number I measured tap water directly afterwards and got 27 ppm again. Fermentation went fine like it always does. Then next batch we calibrated with compressed air before taking a reading and got 27 ppm again, then measured tap water at 24 ppm this time. Is this even possible?! I always understood the theoretical maximum solubility of water being less than 14 ppm?
We oxygenate through a 8 inch carbonation stone with pure welding grade oxygen from prax air, at 2 LPM for a 30 minute transfer on a 10 bbl batch. The DO reading was taken directly after knockout was complete from my sample valve.
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