Does the AD8495 thermocouple amplifier allow for grounded thermocouple probes?
You can use it.

In the 1st paragraph at pg 12 it tells how the IC deals with the problems coming from single-ended (i.e. grounded one end) TC usage. 

The last sentence of that paragraph is the answer.


  The excellent common-mode rejection of the AD849x prevents variations in ground potential and other common-mode noise from affecting the measurement.