The following document has been put together by Transtronics to help people understand pressure transducers.
Pressure transducers used in industry today take on a rather typical appearance.
A round, tubular stainless steel body with a pipe fitting on one end and a cable coming out of the other end. Stainless is used because of its high strength and resistance to corrosion. As we continue our journey through the transducer we come to the other side of the diaphragm where one side of the sensor element is. This variable resistor forms one leg of a bridge circuit . The other side of the strain element is the reference port that the measuring port is compared to.