For reliable level monitoring in sewage treatment silos, a waterproof magnetostrictive level gauge must combine accurate measurement with corrosion resistance and long-term stability. Key technical parameters usually include a measuring range of 300-6000 mm, accuracy of +/-0.5 mm or +/-1 mm, resolution of 0.1 mm, and repeatability of 0.05% FS. The probe is commonly SS316L, and the housing is IP68 rated for continuous immersion protection. Power supply is 24 VDC, with a wide option of 12-36 VDC, and output options include 4-20 mA, HART, RS485, or Modbus. The maximum output load is 500 ohm, insulation resistance is at least 100 Mohm, and response time is under 100 ms. Process connection can be flange or thread, with cable length customized for silo depth. Working temperature is -40 C to 85 C, and pressure rating should match installation conditions. For sewage service, anti-corrosion coatings, sealed cable glands, surge protection, and Ex ia certification are recommended. The gauge should also provide a local LCD display, zero and span adjustment, reverse polarity protection, and EMI shielding. When selecting a unit, confirm probe length, mounting position, medium density, and foam or sludge conditions. A suitable waterproof magnetostrictive level gauge delivers stable level data for pumps, alarms, and aeration control, reducing maintenance and improving treatment efficiency.