Pressure sensing technology, used to measure pressure at different heights/levels, has found useful applications in fluid
level monitoring systems. Placed at the top of the container, the pressure sensor is connected to an open-ended tube that is submerged in the container as indicated by Fig. 1. The amount of water in the container exerts proportional amount of pressure on the sensor via the trapped air in the tube [3]. The output from the sensor therefore, produces voltage proportional to the pressure inside the column. The voltage can then be calibrated to give output response for the proportional height or level of liquid in the tank.