4. Introduction Transducer and sensing element are two different concepts >Sensing element: the element or unit which directly senses and converts the measured quantities > Transducer: the whole device consisting of a sensing element with its associated auxiliary components and circuits, the sensor or sensing element being the kernel component• Transducer and sensing element are two different concepts. ➢Sensing element : the element or unit which directly senses and converts the measured quantities ➢Transducer : the whole device consisting of a sensing element with its associated auxiliary components and circuits, the sensor or sensing element being the kernel component 4.1 Introduction