In sewage treatment plants, reliable position feedback is essential for gates, valves, sludge scrapers, and aeration equipment. A waterproof linear displacement sensor converts linear motion into an electrical signal while resisting moisture, chemicals, and pressure. Its technical parameters determine accuracy, durability, and compatibility with PLC and SCADA systems.

Measuring range is commonly 50 mm to 1000 mm, with custom lengths available. The output signal can be 4–20 mA, 0–10 V, RS485 Modbus, or CANopen. A 24 VDC power supply is standard. Linearity is typically ±0.05% FS, repeatability ≤0.01 mm, and resolution ≤0.01 mm. These values ensure stable valve-position feedback and precise scraper control.

The protection class should be IP67 for washdown areas and IP68 for submerged or high-humidity zones. The pressure resistance may reach 1–10 bar depending on housing. Operating temperature ranges from -20°C to +80°C. The housing is usually 304 or 316L stainless steel, with a PUR or PTFE cable and sealed connectors. 316L is preferred for corrosive sewage gas and chemical splash.

Other parameters include vibration resistance of 10–2000 Hz, shock resistance of 50 g, and EMC compliance for industrial environments. The sensor should support a long mechanical life, often over 50 million cycles. Proper installation with a rigid mounting bracket, protected cable routing, and regular inspection improves service life.

When selecting a model, match the stroke, output, protection grade, and material to the installation site. For sewage treatment, waterproof linear displacement sensors with IP68 sealing, 316L stainless steel, and 4–20 mA or RS485 output provide reliable position measurement for valves, penstocks, and sludge equipment.