What you can do is use the DAQmx Device Property node with "Product Type" property. This will give you in string the type, like NI 9211. With this info you should create an own table with corresponding string values(like "Thermocouple") and chose the right one from the array. Unfortunatelly there is no property tha will give you directly this information.
I was thinking of that already but that would mean that I would have to update such a table regularly which is not really handy. It would be nice to have such a property for the future. I think I saw somewhere a discussion about future DAQmx property nodes. This would be the right "candidate".