Hi all, I wonder if what I’m seeing is normal/ok/undesirable
I have been doing 900 gram roasts recently. I notice the bean probe and IBTS curves cross at some point during first crack— the bean probe showing higher temperature than the drum. On all my smaller roasts, IBTS is several degrees higher than bean temp for the whole roast.
I preheat to 290-305° C and start at P9/D9, I keep the power high for most of the roast. Here’s an example (its yummy, no complaints): https://roast.world/r/GDJe8QrzEYiciK0pZUWvF
I’m wondering if this profile is to be expected for large roasts, or if perhaps I’m not using the best fan/drum settings. I don’t think I should increase the preheat very much because I’m already getting some surface scorching— I think that’s from when the beans are charged in a very hot drum.
Just seems odd to me the lines would cross (maybe it’s an illusion? the bean probe is not exact and all that)
thanks for your time and thoughts!