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Thread: Question - Temperature probe placement?

  1. #1
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    Question - Temperature probe placement?

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    Before I start drilling a hole through the side of my breadmaker, (Breville BB280) I thought I would ask - where is the best place to put the probe?

    Im going to put the gun above the top left corner of the pan, looking from the top. Would you put the tip of the probe in under there, or is this going to be influenced by the hot air too much.

    Should it go diagonally opposite where the hot air blows - or will this read too low? Maybe Ive answered my own question, and should put it somewhere in between?

    What do you think?

    Cheers

  2. #2
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    Re: Question - Temperature probe placement?

    Gday Philmac

    As long as its in a different corner to the HG, I reckon youll be right. My HG points into the bottom right corner as Im looking at it, and the probe is in the bottom left.

    My BMs paddle spins clockwise as you look from the top, so I have the probe coming in from the side so it "points" clockwise too, so the beans werent hitting it end on, which I thought might dislodge it.

    My probe sticks into the pan about 25mm Id say, and is about 10mm away from the side wall. I have 4 holes drilled through to use, lowest is about 10mm off the floor of the pan, with the other holes spaced about 10mm apart upwards from there, the theory being probe position can be varied depending on the roast batch size.


    Cheers...................Sean


  3. #3
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    Re: Question - Temperature probe placement?

    Thanks for that Scooter.

    Good point about the direction the beans will be travelling - I dont think I had given that much thought. Ill put in some beans and see how far they go up the sides and put the probe in halfway up that measurement.

    Cheers

  4. #4
    Senior Member greenman's Avatar
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    Re: Question - Temperature probe placement?

    I initially had my probe too deep in the bean mass and would record 185C for 1st crack, after talking to Javab I raised the probe into the top 1/3 of the bean mass and immediately 1st crack recorded 195C .

  5. #5
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    Re: Question - Temperature probe placement?

    Ive got my temp probe the same as scooter (bottom left) and the HG is pointing into the bottom right. The probe is also almost near the base of the bread pan (deep into beans) and initially I only had 5-7cm of the probe inside the bread pan itself and was getting very inconsistent readings. I was getting FC at 175-180 degrees and SC below 200. At first i thought it was because the probe was too deep (near the bottom) but I figured, if that was whats showing at the bottom, Id rather know what the temp was at the bottom and monitor the possibility of the surface temp being way higher than the beans at the bottom which could result in uneven roasts. Turns out, it was because too little of my probe was inside the bread pan. Drilled a bigger hole in the BM so that I coudl stick more of the probe inside the breadpan and the results were much better. FC @198 - 205 degrees.
    Lately, especially in the colder weather, I found it easier to control the temp not so much by raising or lowering the HG, but by varying the amount of "cover" over the breadpan. I use 2 small plank offcuts to partially cover the BM, and it was easier to control the rate of rise (temp) by changing the surface area being covered.

  6. #6
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    Re: Question - Temperature probe placement?

    Behmor Coffee Roaster
    Quote Originally Posted by Mal link=1213057594/0#3 date=1213089327
    We still use our BM for making bread occasionally so I didnt want to drill holes in the panelling anywhere. As a result, I stick the probe down through a hole in the wooden cover into a corner of the bread-pan. Works pretty well and I can slide it up and down depending on the size of the batch Im roasting.
    Good idea Mal. I think Ill try this, with the probe tied to a piece of wire attached to the wood for support, ease of of height adjustment and in case Im ever likely to use the BM for its original purpose. (unlikely) Also this way Ill have to take the probe off before cooling and therefore it wont get bent!

    Cheers



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