Detachable pt100 temperature probe

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LeeH
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Detachable pt100 temperature probe

Post by LeeH » 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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brewzone

Re: Detachable pt100 temperature probe

Post by brewzone » Tue Jan 09, 2018 10:51 pm

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.

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