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Behmor 2020 temp logging

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  • SanderP
    replied
    Thanks very much for the insights Andy it certainly helps to understand what is going on.

    There's gotta be a joke about hot air in there somewhere

    Cheers

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  • Andy
    replied
    Originally posted by SanderP View Post
    if I plot (A + B) * 0.75 I get something that seems to make sense
    Now that's creative!

    FNQ's link to the FAQ is mostly right but there are a few errors in it, eg: the exhaust sensor is before the venturi so it won't be affected.

    Both sensors will show 54C until the temperature read is higher than that.

    The A temp is in the exhaust channel and all you are doing is measuring the exhaust air temperature. The biggest affect on this number is when the afterburner comes on you are reading mostly the hot air after the afterburner. In theory you could manually check the A temp just before the afterburner comes on and subtract the difference it made to the total, that might be a slightly more usable, more sensible number. (A=A - afterburner)

    The B temp is a thermistor on the right side wall and is measuring the physical chamber temperature. There would be some correlation to the bean temperature but when the draw fan comes on (with the afterburner) the exhaust channels higher air flow cools the large metal chamber surface area faster than the beans. This will make the heat curve look flatter than it is at the bean, you might be able to calculate a similar "fudge factor" to allow for it as the scroll fan speed is constant after it comes on. (B=B until the draw fan and then B=B+x)

    At the end of the day, those two temperature readings are used internally in the roaster to determine that the the roast is progressing as normal and that things are not hot enough to cause damage to circuitry. Having them exposed via the A and B buttons lets you see them, if that's useful, great!

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  • SanderP
    replied
    Yes I did read that several times.

    I suppose I thought I found a signal in all the noise and was searching for something to demonstrate repeatability but I'll stick to the timer my senses and not their sensors.

    Regardless I'm super happy with the Behmor and having a ball.

    Cheers

    Leave a comment:


  • FNQ
    replied

    Not sure if this helps

    https://behmor.com/knowledge-base/ab...-reading-faqs/

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  • SanderP
    started a topic Behmor 2020 temp logging

    Behmor 2020 temp logging

    I'm very new to the roasting game and loving my explorations so far.

    I've got me a new Behmor 2020 and while all the roasting is pretty much governed by my sigh/sound/smell senses I've been capturing the 'A' 'B' temp outputs more or less because they are there and not as any particular guidance for my roasting.

    But given the data is there I've been dutifully plotting it and pondering what the hell it means and what I should actually do as a consequence.

    In isolation the plot data for 'A' and 'B' dont make much sense to me BUT I've formulated an idea that in combination the temps might actually approximate what is happening in the bean mass (insert hysterical laughter now!)

    I don't have enough data to really prove it up but in my roast spreadsheet if I plot (A + B) * 0.75 I get something that seems to make sense with regards roast progression and first crack occurring more or less when it should temperature wise.

    Would be interested to hear what other more experienced folks do with their 'A' 'B' temp data.



    Cheers
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