This submersible level sensor is simple to use,just put the probe into the bottom of water tank,river,deep wells etc. How to choose a right product ? 1. Measuring range = level height (if the maximum level height is 4m,you can choose 4m or 5m etc,can't choose a small range 3m) 2. Output signal : 4-20mA (2 wires 0-10V ,0-5V,1-5V (3 wires ) RS485 Modbus (4 wires) 3. Power supply : DC24V for 4-20mA ,0-10V,0-5V,1-5V,RS485 (DC10-30V wide range of voltage supply) 4. Cable length :choose the cable length according to your request (we can customize the cable length for you,pls contact us if you need a customization ) Product Features . QDY30B is a submersible Water Level Sensor suitable for liquid level or pressure and depth measurement. It has a strong anti-clogging protective filter probe, it can filter kinds of impurity particulate matter in measured liquids,effectively protect the sensor and circuit board inside the probe. It made of 316 SS housing. Its all stainless steel, hermetically sealed housing make it suitable for immersion in most industrial liquids and oils. .The welded housing is tested in-house via a helium leak tester to ensure proper protection. Ventilation tube in the cable automatically compensates for changes in atmospheric pressure above the tank. .The conductors of the cable are also isolated from the outside environment to keep the level sensor operational for long-term use. Each submersible pressure transducer features a removable nose cone at the sensor which protects the diaphragm from damage. Technical Parameters Model QDY30BAnti-clogging liquid water levelsensor Measuring Range 0~0.5~500m H2O Power supply 24VDC Output Signal 0~5V, 0-10V Accuracy 0.5%FS Response Time 1ms (up to 90%FS) Long-term Stability 2F.S/Year Medium Temperature -20~85 Working Temp erature -40~80 Overload Capacity 200%F.S Insulation Resistance 100M/250VDC Sensitivity Drift 2 %F.S Zero Drift 2%F.S Protection IP68 Measuring Medium Various medium which is compatible with SS304 Mechanical Vibration 20g (20~5000Hz) Impact 100g (11MS) Material Junction box: Low content Cu-Al alloy Probe: Stainless steel Cable: Polyurethane cable Application Static liquid level, Liquid tank, Sewage water, Well, Lake,etc.