Study, testing and application of proximity sensors for experimental training on measurement systems

This paper presents an experimental system that allows the study and testing of two proximity sensors (inductive and capacitive) and their use in an application. The guideline for studying these devices enables students to test the working modes of Turck inductive and capacitive proximity sensors, apply their previously acquired theoretical knowledge about sensors, transducers and electronic circuits select and use the information from datasheets. An application of inductive and capacitive proximity sensors is also implemented using a programmable logic controller. A metallic object moves on a linear trajectory between two boundary positions detected with the studied inductive sensor and capacitive sensor respectively. The object reverses the movement direction when it reaches a limit position. The programmable logic controller performs the monitoring of sensors' outputs and controls the object movement sense. The students can analyze the design and implementation of this experimental system for motion control, the operation of input and output circuits of programmable logic controller and the connection of each sensor to this equipment. The experimental system has been proved useful in academic study for experimental training on measurement systems.