I am current want to develop a thermocouple circuit that can handle the full range of all thermocouples ie. J, K, E, S, T, R, B, G, D.

My plan is to uses a LTC2400 24bitADC to measure the millivolt output of the emf. I will probably use a artifical ground of 1volt. With the artifical ground at 1volt the lowest possible temperature will never give me a negative ADC value.

For Cold Junction comp. I plan to use a digital temperature sensor (ds1820s)to measure the cold junction temperature.

In software
1.) I will convert the Cold Junction Temperature into millivolts using a table or a Function.

2.) I will convert the ADC value in millivolts by substracting the artifical ground ie 1Volt.

3.) I will than add the cold junction millivolts to the EMF millivolts to produces the total millivolts.

4.) I will use the total millivolts to find the temperature of the missing end of the junction.

Please suggest new, different, or better ways to accomplish this circuit.