Designed for sewage treatment gates, this waterproof LVDT displacement sensor provides reliable linear position feedback in humid, dirty, and corrosive environments. Its sealed stainless-steel housing and IP68 protection allow continuous operation under splashing water, temporary immersion, and washdown. Typical measurement ranges are 0–50 mm, 0–100 mm, 0–200 mm, and 0–300 mm, with custom strokes available. Key technical parameters include linearity ≤±0.25% FS, repeatability ≤0.01 mm, and practically infinite resolution. The sensor operates from 24 VDC ±10% and outputs 4–20 mA, 0–10 V, 0–5 V, or RS485 for PLC and SCADA integration. Frequency response reaches up to 200 Hz. Operating temperature is -20°C to +85°C, with optional -40°C to +100°C versions. The probe and housing use 304 or 316L stainless steel; cable entry is M12 or direct gland with PUR/PVC cable. Pressure resistance is up to 1 MPa for selected models, and shock/vibration ratings meet 50 g/10–2000 Hz. EMC protection complies with IEC 61000, with reverse-polarity, short-circuit, and surge protection. Insulation resistance is ≥100 MΩ at 500 VDC, and dielectric strength is 500 VAC. A guided-core design minimizes wear, while the non-contact coil assembly supports long service life and stable signals in sludge-laden areas. For sewage gate position monitoring, select range, output, cable length, and mounting thread according to stroke, control system, and immersion conditions. Regular zero/span checks and cable inspection are recommended.