A pressure sensor is a device sensing pressure and converting it into an electric signal where the amount depends upon the pressure applied. It helps to detect, measure, and transfer information, to analyze the performance of a device. It monitors and controls the pressure, typically of gases & liquids. A pressure sensor is a device sensing pressure and converting it into an electric signal where the amount depends upon the pressure applied. It helps to detect, measure, and transfer information, to analyze the performance of a device. It monitors and controls the pressure, typically of gases & liquids.