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Hi

In my eyes this makes no sense.

Let´s say you have a merange of 2000°C then the resolution would be 0.0038°C. You get nowhere near this value regarding precision or accuracy.

.. or 140nV = 0.14uV

Noise, unlienarity, measurement problems, timing ... will cause erros several decades worse.

--> be happy to get a useful resolution in the 12 bits range.

--> be happy to get the accuracy in the 8 bits range.

Even if you calculate those values like 0.036666 C/s ... it does not work this idealistic way. Reality is different.

This looks like an ON/OFF control. Here the resolution above makes even less sense.

Then you talk about several kW of heating power. How is it controlled?

Relay? SSR? phase angle control?

If ON/OFF per relay ... you probably want to reduce switching counts. .. using low frequency PWM style (like electric heat plates do)

With software you can improve a lot. Like calculating temperature difference, heat capacity, heating power, heater percentage ... even in look ahead mode.

Klaus