The sensors are transducers and electronic detectors activated by the energy delivered by a system and that in turn deliver another type of energy to another different system. The transformed energy may be of physical, chemical or biological origin.

An optocoupler, also called optoisolator or optically coupled isolator, is an emitting and receiving device that works like a switch that is turned on by the light emitted by a led diode that saturates an optoelectronic component.

(4) When integrated into a system, the designations and symbols presented here form a dedicated language that communicates concepts, facts, intent, instructions, and knowledge about measurement and control systems in all industries.

Symbols of electronic sensors, transducers... On the largest symbols collection in the network. For consultation, design and interpretation of components, devices and electrical circuit diagrams and electronic

Drives with contacts can also be drawn as one symbol, e.g. pressure switch. The wiring diagram will not draw the pipeline in which the pressure switch is installed, only its contact. Therefore, with contacts controlled other than electrically, their drive is drawn.