Today, as the IR sensing technology evolves, the sensors also come in various system designs. Active Infrared (IR) sensors can be an emitter and detector as a single unit operating at the same. wavelength, or photoelectric sensor working with reflective surfaces. IR sensors can be categorized. as retro-reflective sensors and diffuse reflection sensors. Retro-reflective sensors are more proper.
1 A note about your meat: make sure you get rump roast, round roast, or sirloin-one of the cheaper cuts. 2  Using the slow roasting method for prime cuts of beef doesn't work as well, since prime cuts are more tender. 3  If you want to cook a prime cut of beef, see How to Cook a Prime Rib Roast. If you want to cook a prime cut of beef, see How to Cook a Prime Rib Roast. 2  Make sure the beef you get is boneless, and check for a dark pink, springy surface and plenty of marbling. 3  Depending on the cut you get, it might have a cap of fat on top.
Step 4: When ready to cook, brush and oil the grill grate. Place the roast, fat side up, on the hot grate over the drip pan and cover the grill. Step 5: Grill the roast until cooked to taste, 3 1/2 to 4 hours for a medium-rate roast of this size, figuring on 12 to 14 minutes per pound.(If using a charcoal grill, youâll need to add 10 to 12 fresh coals to each side every hour.esides, you can let a cooked prime-rib roast stand for up to 30 minutes before carving. Indeed, at least 10 to 15 minutes of standing time is recommended to allow the juices to flow from the center of the roast back to the exterior. 1  Yield: 12 to 16 servings. 2  Method: Indirect Grilling.