You need to place the PCB more or less in the middle of the oven between the top (furnace) and the bottom sensor. It is very important that the PCB is at least under the top sensor so that this sensor is not receiving any radiation heat from the bottom heater IR-lamps. This to ensure that the temperature controller will function properly. (Very small boards can be placed on an older larger PCB or FR-4 piece of material.)

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