A pressure sensor is a device that measures the pressure of gases or liquids and converts it into an electrical signal for monitoring or control applications. It typically works by using a sensing element, such as a strain gauge bonded to a diaphragm, which deforms when pressure is applied. This deformation changes the electrical resistance in a Wheatstone bridge circuit, producing a proportional electrical output.

Modern pressure sensors, like stainless steel-constructed transducers, are designed to withstand shock, vibration, and harsh environments. They are often temperature compensated to ensure accuracy across varying conditions and can provide either voltage or current outputs depending on the application. Such sensors are widely used in hydraulic systems, refrigeration, process control, robotics, and automotive industries, and can also be paired with digital indicators for real-time monitoring and precise measurement.