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Query about AD8497 Output

Hi, there

I have a question about AD8497. I used AD8497 for Type K thermocouple. I put thermocouple into the mixture of ice and water, which should be 0°C. However, the output of AD8497 shows it is 5°C. I tried with many temperature points. It shows the result is correct above 20°C; while the result is incorrect below 20°C. I also tried under the conditions of both single +5V supply and dual +/-5V supply for AD8497. The result is the same. My schematic is attached for your reference.

Could you please help with my issue or give some comments on it?

Thanks so much!

Br,

Wayne

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