Water conservancy gates operate in humid, splash-prone, and silt-laden environments, where ordinary LVDT displacement sensors may suffer corrosion, signal drift, and short service life. The corrosion-resistant LVDT displacement sensor is developed as a reliable import substitute for gate opening monitoring. Its stainless-steel housing, sealed coil assembly, and IP68 protection resist long-term moisture, condensation, and chemical attack. The sensor delivers stable linear output for stroke measurement of sluice gates, penstocks, and radial gates, providing real-time feedback to PLC and SCADA systems. Compared with imported models, this domestic replacement offers short delivery, lower maintenance cost, and fast technical support. Spare parts and on-site commissioning are available locally, reducing project risk and total cost of ownership. Key advantages include strong EMI immunity, a wide temperature range, repeatable positioning, and simple installation. The compact probe and flexible cable suit narrow gate rooms and harsh outdoor cabinets. It can be used in new projects or retrofits without changing existing control logic. By adopting this import substitute, reservoirs, pumping stations, and hydropower plants can improve flood-control reliability and reduce downtime. During selection, confirm measuring range, output signal, cable length, and mounting thread to match site conditions. For high-vibration sites, reinforced brackets and shielded cables are recommended to ensure long-term accuracy. Correct grounding and periodic inspection further extend service life. With proven performance in water conservancy applications, it supports safe operation, predictive maintenance, and digital twin platforms. This sensor is a practical choice for intelligent water conservancy upgrading and long-term gate safety monitoring.