Momentary IBTS drop-out

Toward the end of a roast last week the IBTS curve showed a strange dip:

Maybe a bean or flake of chaff temporarily blocked the sensor? Inspection showed no obvious dirt but I cleaned the sensor anyway, and no further issues have appeared 10 days later.

Anyone else seen this?

Not personally but I recall reading about that before. My speculation would be the same as yours: something momentarily blocked the sensor view port. I suppose there is the possibility a connector isn’t seated properly but after all your use it seems unlikely.


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