Selecting an explosion-proof linear displacement sensor for a bucket wheel stacker-reclaimer requires a risk-first approach. The machine operates in coal, ore, or biomass yards where combustible dust and occasional gas may be present. Confirm the hazardous-area classification, gas/dust group, temperature class, and required protection method. Choose sensors with valid Ex certification for the target zone and enclosure, such as Ex d, Ex e, or Ex ia, depending on installation and circuit design. Measurement range should cover boom luffing, slewing, travel, or bucket-wheel positioning with adequate mechanical margin. Specify accuracy, repeatability, resolution, and update rate that match control needs without overspending. The sensor must resist shock, vibration, dust, moisture, and temperature swings; look for IP66/IP67, robust housing, and stable bearings or guide systems. Output compatibility matters: 4–20 mA, 0–10 V, SSI, CANopen, or PROFIBUS/PROFINET should match the PLC and cable length. Plan mounting to avoid misalignment, mechanical overload, and cable strain. Use shielded, flexible cables and proper grounding to reduce EMI. Consider maintenance access, calibration, spare parts, and lifecycle support. For critical stacker-reclaimer positions, redundancy or dual sensors can improve availability. Finally, verify documentation, certificates, and factory testing before approval.