The petrochemical industry, as a pillar of the national economy, is always accompanied by harsh working conditions such as high temperature, high pressure, and strong corrosion in its production process. The media are mostly dangerous substances such as crude oil, refined oil, aromatic solvents, and sulfur-containing wastewater. As a core link in the production process control and safety supervision, liquid level measurement is directly related to the stable operation of the equipment, accurate material measurement, environmental compliance, and personnel safety.