Inspection of Piston Rings at PSA Piston rings at PSA are inspected using an automated system. Since being tted with KEYENCE laser displacement sensors a few years ago, the system makes accurate and detailed on-line measurements. The town of Trémery, located 20 kilometers north of the city of Metz, in northeastern France, is home to an engine plant owned and operated by PSA. Opened in 1979, the plant employs 3,740 people and turns out 6,500 four-cylinder diesel engines each day, making it the world’s largest diesel-engine plant and the fourth largest for all types of engines combined. At the plant, piston rings are tted on engines by a robot. Each piston ring is split, allowing its ends to be spread apart so that it may be slid into a groove specially machined on engine pistons. Piston r

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