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  1. #1
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    Charge Temp and Environmental Temp ?

    Good Day,

    Can someone offer an explanation on the below.

    I roast on a Diedrich IR5. I follow a strict warm up procedure, I record the outside air temp, humidity and air pressure. I record every roast on Artisan.

    Normally when I charge the roaster with green beans I do so when the BT reading reaches a certain temp say 215 C. The recorded ET at this point is usually +- 10 C lower. Two days ago I roasted with normal weather conditions (warm and humid) and nothing out of the ordinary with regards to batch weight, bean type, weather etc. To myself surprise the ET was the same as the BT at charge resulting in a noticeably faster and hotter roast. Today I adjusted my settings to accommodate for the change only to find that the ET was back to being around 10 C cooler resulting in a much slower and almost stalled roast.

    I have no explanation.

    Thank you

  2. #2
    Senior Member
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    Sounds like an airflow change...

  3. #3
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    Quote Originally Posted by Musicphan View Post
    Sounds like an airflow change...
    Thank you,

    If you have the time, could you suggest / explain a bit more.

    Regards Lawrence

  4. #4
    sae
    sae is offline
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    wind speed differences?

  5. #5
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    wind speed differences?

  6. #6
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    Quote Originally Posted by Law104 View Post
    Thank you,

    If you have the time, could you suggest / explain a bit more.

    Regards Lawrence
    Sorry - been crazy busy trying to pivot my business to 100% retail/mailorder. I was simply stating if that all of your key environmental variables are constant than its most likely something with your machine. I do find that if there drastic differences in weather conditions I see slight differences, but not significant. Primarily when its rainy my roasts tend to be slightly slower roasting and I need a bit of energy. However, since you said the environmental information is fairly similar as I would say its something within your machine. Either the gas pressure has changed - my USRC 12K runs on very low pressure so I doubt that it would be that issue, but possible. Or most likely, there has been a change to your airflow within the roaster. On my machine the ET is in a higher position than the ET probe and since heat rises it's always hotter. Since your ET was the same as the BT I would make the assumption that your airflow rate is higher causing it to drop.

  7. #7
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    Musicphan thank you,

    I also think that the issue is within the roaster. I have made contact with Diedrich and I am still waiting for a reply from their engineers. I will pass on the feedback if I receive any.

    Regards............

 

 

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