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
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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.

Sent from my T6pro using Tapatalk
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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