Selecting a high-pressure linear displacement sensor for a chemical hydraulic cylinder requires balancing pressure integrity, chemical compatibility, and control accuracy. First, confirm the cylinder’s maximum working pressure and peak surges. Choose a sensor with a proven pressure rating above these values, including a robust pressure tube, sealed flange, and compatible O-rings. Wetted materials must resist the hydraulic fluid and any chemical exposure. Stainless steel 316L, PTFE, PEEK, and chemically resistant seals are common choices; verify compatibility with the fluid supplier’s data. Next, define stroke length, resolution, repeatability, and linearity. Magnetostrictive or LVDT sensors often suit high-pressure cylinder position feedback, while analog 4–20 mA, 0–10 V, SSI, IO-Link, or CAN outputs should match the controller. Consider mounting space, rod-end access, cable routing, and protection against vibration and shock. In chemical plants, select IP67/IP69K housings and EMC-tested electronics, and use explosion-proof or intrinsically safe versions where required. Temperature drift, pressure cycles, and fluid cleanliness also affect service life. Specify calibration, connectors, cable jackets, and maintenance access early. A documented FAT/SAT and spare-parts plan reduce downtime. By matching pressure rating, materials, output, accuracy, and safety certification to the application, engineers can ensure reliable position feedback and safer chemical hydraulic cylinder operation.