RS485 Digital Liquid Level Sensor Submersible for Water or Diesel Fuel Tank, IP68 Waterproof 4M Range

QDY30A Liquid Level Transmitter The QDY30A is a submersible liquid level transmitter designed for reliable, longterm level measurement in a wide range of industrial and environmental liquids. Its hermetically sealed stainless steel probe and robust junction box make it suitable for tanks, wells, lakes, and sewage systems where stable, digital level data is required. Key benefits Reliable digital output: RS485 communication provides stable, longdistance data transmission compatible with common monitoring systems. Durable construction: 304 and 316 stainless steel probe materials and a welded, hermetic housing resist common corrosive effects in industrial and environmental liquids. Stable performance: 0.5% FS accuracy, response time of 1 ms to 90% FS, and longterm stability of ±2 F.S./year support accurate monitoring over time. Environmental protection: IP68 protection rating and rugged cable design allow longterm submersion and continuous operation. Pressure and impact resistance: 200% F.S. overload capacity, 20 g vibration tolerance (20 to 5000 Hz), and 100 g impact resistance (11 ms) suit harsh field conditions. Technical highlights Model: QDY30A liquid level transmitter Measuring range: selectable options up to 500 m H2O (optional ranges available) Power supply: 24 VDC Output signal: RS485 Accuracy: 0.5% FS Response time: ≤1 ms (to 90% FS) Longterm stability: ±2 F.S./year Overload capacity: 200% F.S. Insulation resistance: 100 MOhm at 250 VDC Sensitivity drift: ±2% F.S. Zero drift: ±2% F.S. Protection rating: IP68 Medium temperature range: 20 to 85 C Working temperature range: 40 to 80 C Mechanical vibration: 20 g, 20 to 5000 Hz Impact: 100 g, 11 ms Materials: junction box made of lowcopper aluminum alloy; probe made of 304 or 316 stainless steel; polyurethane cable Measuring medium: suitable for media compatible with SS304 stainless steel Design and reliability features Hermetic welded housing tested inhouse with a helium leak tester to verify sealing integrity. Ventilation tube integrated in the cable to compensate for atmospheric pressure variations above the tank and maintain reading accuracy. Cable conductors isolated from the external environment for extended operational life in submerged applications. Practical applications Sewage and wastewater monitoring: continuous level tracking in municipal or industrial treatment systems for pump control and overflow prevention. Groundwater and well monitoring: longrange level measurement in observation wells and boreholes with RS485 output to remote loggers. Storage tank inventory: liquid level monitoring in fuel, chemical, and water tanks for inventory management and process control. Why choose QDY30A Combines fast digital response with robust mechanical design for demanding field and industrial applications. Offers flexible range options and digital RS485 output for easy integration into SCADA and data acquisition systems. Engineered for long service life in submerged and corrosive environments through material selection and sealed construction.