LeeH wrote: ↑Tue Jan 09, 2018 3:25 pm
brewzone wrote:Ohm value shouldn't be an issue on say a sestos or Rex c100 when calibrated for zero C.
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Good point and worth mentioning.
You would also be better off calibrating mid point of your process range.
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I have yet to establish whether the MAX31865 adjusts for linearisation using a ref resistor of 430ohms.
Doesn't appear to make it plain in the datasheet.
However the datasheet does show a reading of 100C at 138.51ohms using a ref resistor of 400ohms being given as a reading of 98.56C via the ADC over SPI
I assume that using a ref resistor of 430 this slight error is removed.
However My observations using steam from a kettle gave a reading of around 98.5C so need to do a bit more digging around.