If it's a base sentinel, unless it can adapt to the liquid metal, I don't see how it can win. Even if it does adapt, I still don't see a way for it to put the T-1000 down.
So we're assuming that the Sentinel has already faced mutants before this fight? I was under the assumption that this was just a base sentinel, which would basically have fire blasts and super strength, but nothing else because it's never fought or adapted to anything yet.
Its smaller, far weaker, and no where near as powerful as the Future Sentinel...
Besides, since we use the most current version unless otherwise stated in the OP, the T-1000 is weak against Fire and Ice (two elements that we know for certain the Sentinels can call upon on demand)...
This is something new, a actually interesting thread for the Future sentinels. With that said the Sentinel, also at a base level (which is what I assume) still has super strength, a high durability and it's energy beam attack, which most importantly burns. And we know a significantly high temperature for a extended amount of time kills the T-1000. I'm giving the Future Sentinel the win here more often then not.