I use a Max 31850K one wire board and a thermocouple K type for an oven we make , we tried to calibrate it and we are getting a non linear response , at 40 deg C we calibrate and offset in code so the display matches the Temp. Gun when we go up to 150 deg C it is off by 8-10 deg !! ?? or more .
Any ideas as to what could cause this offset ? the tolerances from the Board and thermocouple should only be maybe 3 deg max .
Max31859K board
https://www.adafruit.com/product/26...UUqiqD0zUgi_0hYZBFRfuTSZx1iZSIpxoCU_AQAvD_BwE
the product
https://nanometer.com/curing-oven
Any ideas as to what could cause this offset ? the tolerances from the Board and thermocouple should only be maybe 3 deg max .
Max31859K board
https://www.adafruit.com/product/26...UUqiqD0zUgi_0hYZBFRfuTSZx1iZSIpxoCU_AQAvD_BwE
the product
https://nanometer.com/curing-oven