Sewage treatment gates operate in humid, corrosive, and submerged conditions. A waterproof linear displacement sensor must deliver stable position feedback for opening control, alarm limits, and SCADA monitoring. Key technical parameters include measuring range from 50 mm to 2000 mm, optional up to 3000 mm. Resolution is 0.01 mm, with linearity +/-0.05% FS and repeatability +/-0.01 mm. The sensor uses a stainless-steel 304/316L housing and IP68 protection, rated for 10 m water depth. Output options are 4-20 mA, 0-10 V, RS485 Modbus, and CANopen. Supply voltage is 12-24 VDC, with reverse-polarity and surge protection. Operating temperature ranges from -20 C to +80 C. The probe and cable resist sewage, sludge, salt spray, and common cleaning agents. A shielded PUR cable with a stainless connector ensures reliable grounding. Vibration resistance is 10-2000 Hz, 10 g; shock resistance is 50 g/11 ms. EMC compliance meets EN 61000-6-2/4. Mounting brackets allow horizontal or vertical installation on penstocks, sluice gates, and actuators. Regular zero/span checks and cable inspection maintain long-term accuracy. These parameters ensure reliable, maintenance-friendly level and gate position measurement in wastewater plants. Optional features include a local LCD display, HART, and redundant sealing. The sensor supports continuous duty and on-site calibration without disassembly. For reliable gate control, specify stroke length, mounting space, cable exit, and media compatibility.