In high-speed packaging lines where compressed air drives pneumatic actuators, a pressure sensor sits directly in the supply line, monitoring the exact moment the air pressure drops below the threshold needed to hold a carton flap closed. The sensor’s signal triggers an immediate stop to the conveyor, preventing misaligned packages from jamming the sealing station. Without this real-time feedback, the line would continue running, producing defective units until an operator noticed the issue—often after hundreds of wasted cartons. Inside automated assembly cells, the same sensor watches the pressure inside a hydraulic clamping cylinder that secures car body panels during robotic welding. If the pressure falls, the sensor sends a fault signal to the PLC, halting the robot mid-cycle to avoid misaligned welds. The cell then alerts maintenance to check for leaks in the hydraulic circuit, reducing unplanned downtime on the body-in-white line. In bottling plants, these sensors are mounted on the air lines feeding the filling nozzles. They ensure consistent pressure for precise liquid dosing, cutting off the flow if pressure fluctuates beyond a set range. This prevents underfilled bottles from reaching the capping stage, where they would fail quality checks and require rework.