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First roasts with data logger

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  • Dimal
    replied
    Re: First roasts with data logger

    Originally posted by 525252180 link=1318770716/49#49 date=1322369151
    Job done.
    I followed your instructions, Mal (and Andys initial thoughts on it), and managed to get it done.
    Its not perfect but its a snug fit.
    Great stuff Ristrom.... [smiley=thumbsup.gif]

    Even though your observed Temps may seem a bit odd to you, at least you can now compare directly with other Behmor owners who have used Andys standard.... 8-)

    Mal.

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  • Beanz.
    replied
    Re: First roasts with data logger

    Hi Ristrom I think you will find it is consistent with the location of the probe. You are not measuring bean temp but a temp in close proximity to the drum. When I moved from the bead to the SS / template my measured temperatures increased. If the roast is ok I would not worry. I did a roast using 1/2 P2 B++.. and if you look at the attached graph it gets close to the 200 Deg in 5 mins that you mention. The graph is odd but the roast was good. If you do a 1lb roast it takes longer to get to the 200. If you still get to the Oak Room I could bring down my laptop and compare some profiles, I usually drop in most days for a coffee as I work nearby, their coffee is sensational !

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  • JJJ
    replied
    Re: First roasts with data logger

    Second roast done, this time without a preheat, and again the same problem.

    Again it hit 200c barely through 5 minutes, peaking at something like 285c.

    After logging the results (by hand), it seems like its moving in a manner consistent with a normal Behmor roast profile, its just that its a good 70-80c hotter than it should be.

    Leave a comment:


  • JJJ
    replied
    Re: First roasts with data logger

    Job done.
    I followed your instructions, Mal (and Andys initial thoughts on it), and managed to get it done.
    Its not perfect but its a snug fit.

    I just did my first roast with the SS probe and unfortunately got some very weird results.
    The read of the ambient temperature was accurate but as soon as i did a one minute preheat, it was reading just over 100c.
    Once i started the roast, the temp shot up astronomically, hitting 200c after only 5 minutes.
    By the time first crack actually hit it was reading something like 260c.

    Any ideas why that happened?
    Going in i thought if it was going to be inaccurate, itd be on the lower end given there is always a chance of heat escaping through the hole the SS probe slots through.

    Very, very weird but im going to do another roast, this time without a preheat, and see what happens with that.

    Leave a comment:


  • JJJ
    replied
    Re: First roasts with data logger

    Youre a king amongst men, Mal.
    Thank you.

    Ill pick up a basic drill at Bunnings on Saturday and make it my weekend mission to get the holes drilled.

    Thanks again.

    Leave a comment:


  • Dimal
    replied
    Re: First roasts with data logger

    Originally posted by 4B4B4B010 link=1318770716/44#44 date=1322006396
    I did it this morning and found it pretty accurate, reaching 99 degrees at boiling point, so you probably cant expect much more than that.
    Excellent... 8-)

    So now you know that the indicated temperature is close to spot-on. If you do decide to grab a new Cordless Drill and attempt the fitting of the s/s probe yourself, try a couple of practice runs first on some scrap metal first - Milo Tin Lids for example...

    When youre ready to have a go at the real thing, stick some Masking Tape on to the side of the Behmor where you will be marking out the hole location. Once marked (and double-checked), select a very small Drill Bit to drill a Pilot Hole first. Place an old towel on the floor, stand the Behmor upright on the opposite end to that which will be drilled.

    You will need to use very little force to drill through the two layers of the Behmor panelling, only fractionally more than the weight of the drill itself. Carefully line-up the tip of the Drill-bit on the hole site youve marked out on the masking tape, then start drilling with the drill held perpendicular to the surface and at a low speed. Get someone to help with judging that the Drill is being maintained perpendicularly if youre unsure about this. Dont overdo the force being applied to the Drill though, a new sharp drill-bit wont require much effort.

    After successfully drilling the Pilot Hole, replace the small drill-bit with the desired final size, and then follow the procedure written above. You will need even less force applied to the Drill this time, as the larger drill-bit will practically pull itself through the Pilot Hole, so take it gently.

    You can clean the burrs from the internal hole using the largest drill-bit in the pack or even better, use a Countersinking Bit to clean off the sharp burrs and afterwards, vacuum out all of the metal cuttings. Thats it... Remove the Masking Tape and fit the s/s Probe and start roasting.... ;D

    Mal.

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  • JamesM
    replied
    Re: First roasts with data logger

    Oh. Behmor, hahaha, post fail. Sorry.

    Leave a comment:


  • JamesM
    replied
    Re: First roasts with data logger

    I drilled a hole right through my bread pan and machine in the rear left corner (when facing the machine). Mounted the thermocouple from under the machine with the probe pointing upwards in to the breadpan. For a couple of reasons, the main one being so I can pull the breadpan fast and easily without worrying about pulling the probe first.

    There are pics of exactly what I did on my web site. URL is in my profile I think. Otherwise its "thebeaningoflife dot com"

    Its easy to take the bottom panel off most BMs, and a good idea to ensure you dont drill through a belt or pulley

    Leave a comment:


  • JJJ
    replied
    Re: First roasts with data logger

    Originally posted by 152A333A2C000D5F0 link=1318770716/42#42 date=1321942546
    When I first used the Behmor I simply held the probe in place by using a large heavy gauge wire paper clip which held the thermocouple wire in place.
    Thanks for the suggestion (and the incredibly helpful photos).
    Seems an easy interim solution if i can find said paper clips.

    Originally posted by 1B36323E335F0 link=1318770716/43#43 date=1321948733
    Andys diagram for the installation of the s/s probe is definitely the best solution.... Do you have any relos or friends who are adept with power tools, etc? Some freshly roasted coffee on offer can work wonders for enthusiasm.... Wink Tongue
    Probably not, sadly.
    I might need some new friends.

    Perhaps i need to get myself a drill and learn how to do such things.
    Theres no wiring in the area Andy suggests for the drilling, is there? And the drilling itself is pretty basic and fool/Ristrom proof?
    Originally posted by 1B36323E335F0 link=1318770716/43#43 date=1321948733
    s an aside, have you checked the accuracy of the t/couple-meter combo? Quite easy to do - Boil some water in an open saucepan then immerse the probe below the surface while boiling. It should read 100deg.C or very close to it.... At least you will know, one way or the other, the status of your metering. Smiley
    Thats a wonderful suggestion, Mal, thanks.
    I did it this morning and found it pretty accurate, reaching 99 degrees at boiling point, so you probably cant expect much more than that.

    Leave a comment:


  • Dimal
    replied
    Re: First roasts with data logger

    Originally posted by 6666662C0 link=1318770716/38#38 date=1321925573
    Ive seen both Andy and  Mal reference being able to, and apparently successfully, simply sit the bead TC in the roaster which was my aim.
    Andys diagram for the installation of the s/s probe is definitely the best solution.... Do you have any relos or friends who are adept with power tools, etc? Some freshly roasted coffee on offer can work wonders for enthusiasm.... :P

    As an aside, have you checked the accuracy of the t/couple-meter combo? Quite easy to do - Boil some water in an open saucepan then immerse the probe below the surface while boiling. It should read 100deg.C or very close to it.... At least you will know, one way or the other, the status of your metering.

    Mal.

    Leave a comment:


  • Beanz.
    replied
    Re: First roasts with data logger

    When I first used the Behmor I simply held the probe in place by using a large heavy gauge wire paper clip which held the thermocouple wire in place. The wire will move as it is not a rigid mount but it is OK as a starting point.The critical thing is to ensure the tip is nominally in the same place for every roast as any variation in position will change the relative temperatures being measured. Also make sure the probe tip is not touching any surface of the roaster and is simply measuring free air. I lined it up with the back edge of the drum. If you bend the wire gently where it goes through the door and seal you will find it lines up fairly well each time. Try to work on drilling the holes using the dimensions Andy has given and using the SS probe it is much easier. Neither method will give the exact bean temp but what you are aiming for is repeatable roasts, as long as probe is in the same place each time you are still repeating the same conditions. Good luck and I hope this is of assistance.





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  • artman
    replied
    Re: First roasts with data logger

    Originally posted by 030303490 link=1318770716/40#40 date=1321934670
    Ive heard of people somehow fixing the bead TC, hanging it over the left mount and getting accurate results but ive not actually seen an explanation of how theyve achieved it.
    Maybe find this post and try to PM the person, if they are still around they will probably get back to you.

    Cheers

    Leave a comment:


  • JJJ
    replied
    Re: First roasts with data logger

    Originally posted by 293A3C252926480 link=1318770716/39#39 date=1321929483
    Have you tried a search?
    I certainly have, many times.

    Originally posted by 293A3C252926480 link=1318770716/39#39 date=1321929483
    Maybe someone else has done this already?
    Ive heard of people somehow fixing the bead TC, hanging it over the left mount and getting accurate results but ive not actually seen an explanation of how theyve achieved it.


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  • artman
    replied
    Re: First roasts with data logger

    Sorry, I am not sure of the design of your roaster, so cant help with intelligent ideas of mounting the probe. Have you tried a search? Maybe someone else has done this already?

    Cheers

    Leave a comment:


  • JJJ
    replied
    Re: First roasts with data logger

    Originally posted by 3625233A3639570 link=1318770716/37#37 date=1321924784
    Sounds like you are not measuring the bean temp, and your temps are inconsistent.
    I thought there wasnt actually a way of measuring true bean mass temp with the Behmor.

    Ive seen both Andy and Mal reference being able to, and apparently successfully, simply sit the bead TC in the roaster which was my aim.
    It obviously cannot be touching the drum, so i thought sitting right beside it, hooked over the left mount would be the most apt place for it.

    Perhaps ive just totally misinterpreted something along the way.

    Originally posted by 3625233A3639570 link=1318770716/37#37 date=1321924784
    Not sure how you could secure the probe in your roaster, maybe you can glue a small bracket and secure the probe to this? Would need to be sure the glue will not give off any toxins etc in the heat.
    Ah, interesting idea, although it still wouldnt allow me to truly measure bean mass temps.
    I thought about using a high heat sealant to secure the bead TC to the roaster but even thats too advanced for my feeble handyman skills and i really dont want it to be totally permanent anyway.

    Thanks for the suggestions.

    Leave a comment:

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