I've never put my ribs in a pan while they were cooking. I get my coals to the point where the majority are red, and the temp is between 225 - 250. Then I just drop my ribs onto the smoker racks, put them away from the fire. I just check them every 30 minutes or so to make sure they don't dry out. If they look dry, I mop them with some marinade. After a couple of hours, I stick the meat thermometer directy into the meat. My wife bought me this nice digital thermometer that even has alarms when you hit a certain temp. When the ribs hit an internal temp of around 175, I wrap them up in foil and drop them back on the fire. I continue to cook them until they reach an internal temp of 190 - 195. You know the ribs are ready when you can take a fork and pull a piece of the rib off the bone. Most pork rib racks I cook usually don't take more than 3 hours before they're ready. Mainly because there's more bone than meat, unless you do baby backs.