Water conservancy gates work in humid, splashing, and polluted environments. Ordinary displacement sensors often fail due to corrosion, condensation, and signal drift, which weakens gate position feedback. A corrosion-resistant magnetostrictive displacement sensor is a practical import substitute for gate opening monitoring. Its non-contact measuring principle avoids wear, while a stainless-steel housing, sealed connector, and anti-corrosion coating resist moisture, salt spray, and chemical attack. The sensor delivers stable linear output, high repeatability, fast response, and strong vibration resistance. It supports 4-20 mA, RS485, or SSI output for PLC and SCADA integration. As a domestic replacement, form-fit-function compatibility shortens installation and commissioning, reduces lead time and maintenance cost, and improves supply chain security. Typical applications include sluice gates, penstocks, hoists, and flood-control projects. With IP67 protection, a wide temperature range, and long service life, it helps owners achieve accurate, continuous, and low-maintenance gate control. Before selecting an import substitute, verify accuracy, EMC performance, corrosion test reports, and project references, then carry out on-site calibration and periodic inspection. This supports safer water management and smarter water conservancy. It also reduces downtime and supports long-term reliable operation.