- If both sensors (furnace and external sensor) are used, the sensor registering the highest temperature regulates the temperature controller. The temperatures between furnace and external sensor might differ a lot. Read here.
- If the external sensor is not used, the top (furnace) sensor takes the control. Please be aware that the board could be warmer than the furnace temperature indicates. This is typically the case with heavy copper boards or IMS boards at the end of the solder curve due to Thermal Inertia.
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