Taking liquid level detection as an example, the pressure is measured using a pressure sensor buried at the bottom of the liquid or at a certain depth, using the formula Pa= ρ CH obtains the height of the liquid level. Pressure sensors have many advantages in measuring liquid level, such as no direct contact with liquid, high precision, easy installation, good real-time performance, long lifespan and stability, stable operation in harsh environments, and reduced maintenance costs, making them a commonly used method for measuring liquid height.