Isolated Analog Inputs could be of several kind. Depending upon the type of industry, there exit (generaly) regulation about safety. Presumably you mean floating input vs grounded input. Unless the cabling is short, all sensors of same brand as the receiving apparatus, then using floating inputs is current practice. That saves many problems, particularly if the instrument ground is inadequate. This suspicious ground is more than common. I have also designed systems for client already badly organised. So, same phylosophy=same satisfaction ! Indeed. Thermocouples are not different than other analog inputs. Look for instance a reputable supplier like Rosemount.
