PH meter Probes...

Discussion in 'General Brewing Discussions' started by NIGHTSKY, Apr 3, 2018.

  1. NIGHTSKY

    NIGHTSKY New Member

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    Hi Gents, calling all Pro brewers.... what type of ph probes do you like ... with many to choose...?.
    Do you cool mash samples etc for probe.
    Just trying to up my game in the World of brewing.
    Many thanks Matt... NIGHTSKY brewing.
     
  2. Nosybear

    Nosybear Well-Known Member

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    I use the MW 102 meter and always cool the samples. I've read recently that some doink out there was saying beer samples should always be pH tested hot.... Baloney! They made those meters long before this guy every wrote an incorrect word about beer! PH samples are ALWAYS cooled before the measurement is taken and if you want to be really precise, to the calibration temperature of the meter. I'm not that obsessive about it but think: There's a standard temperature for a reason! And "hot" isn't a standard calibration temperature. Bottom line, it doesn't have to be 60/68 degrees but pick a standard temperature then adjust your process to get the results you want at that temperature, hot, cold, it doesn't matter.
     
  3. HighVoltageMan!

    HighVoltageMan! Well-Known Member

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    I have a Milwaukee PH56 and I would not buy another one. The Milwaukee MW102, like Nosy has is a better meter for a couple of reasons. First it has a standard BNC connector for the probe, this allows you to buy any BNC pH probe from other manufacturers. One thing is for certain about pH probes, they will go bad because basically they are an organic voltmeter.

    Second reason to but a MW102 is because it comes with a dual junction probe, this makes the probe less prone to failure due to the proteins, sugars, sediment that can plug the junction. The junction is an membrane opening in the probe that "samples" or collects ions from the substance being measured. This membrane is prone to clogging when taking wort samples, so after each use (brew day) it needs to be cleaned, dual junction probes handle this environment better. The best way is with an enzymatic cleaner. The other way is a lot cheaper, but not as good, is to soak the probe in white vinegar for 15 minutes or so and then in a 50/50 mix of household bleach and water for 10-15 minutes. This will prolong the probe life and recondition it if it's slow or won't calibrate. Typical probe life is 6-18 months whether you use it or not. Always store in probe storage solution, never let it dry out.

    My PH56 is okay, but it's a single junction probe and I have to buy an exact replacement probe. No dual junction probes are available. Sorry to go on about this, but I recently had some problems with my meter and this is what I learned.

    As far as measuring hot wort, I would avoid that completely. It wrecks probes. I always measure at @ 80F and I make the assumption that the pH at 80F is about .2 of a point lower in the mash (I actually tried measuring at 145F and found it to be true). pH drops slightly when the temperature rises, I guess it's a little like a battery, the ions are more readily available as the temps rise.
     
  4. Hawkbox

    Hawkbox Well-Known Member

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    I've got a Hanna one that hasn't exactly wowed me so this is worth knowing.
     
  5. Hogarthe

    Hogarthe Well-Known Member

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    If you get one that says it can measure when the sample is hot, you need to keep it at that temp. Its not the heat that ruins the probe, its the heating up then cooling down that it can't handle. Its much easier to cool your sample for a few minutes before testing it.
    Don't have a particular brand to recommend but if you want the best measurements a bench top model is far better than the pen style models, but much more expensive.
     
  6. Nosybear

    Nosybear Well-Known Member

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    Pick a standard reference temperature, though. pH decreases with increased heat so if you measure at differing temperatures, your readings will be off.
     
  7. NIGHTSKY

    NIGHTSKY New Member

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    Cheers Gents , so far for my first post input is great , when I was into aquatics I have a US Pinpoint PH meter ... so could put many different makes on .... have a thick Cole & Palmer trade book with very many probes ... Gel , refillable , Dual Juction etc so many to go for .
    Many thanks Matt
     

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