{"title":"DFRobot SEN0681 RS485 Dissolved Oxygen Sensor - Seawater","handle":"rs485-fluorescence-dissolved-oxygen-sensor-seawater","url":"/products/rs485-fluorescence-dissolved-oxygen-sensor-seawater","description":"This sensor is designed for monitoring dissolved oxygen in seawater and other high-salinity applications. It uses fluorescence quenching rather than a traditional electrochemical cell, so it does not consume oxygen during measurement and does not require electrolyte replacement.The probe measures dissolved oxygen across a 0-20 mg/L, 0-200% saturation range and includes automatic temperature compensation via a built-in temperature sensor. It is intended for demanding marine use such as mariculture, aquaculture, coastal water quality checks and long-term environmental monitoring.Integration is handled through an industrial RS485 interface using the standard ModBus-RTU protocol, making it suitable for PLCs, data loggers and other monitoring systems. The package includes the RS485 fluorescence dissolved oxygen sensor and a sensor cable, and DFRobot provides a product wiki for setup information.Features:Optimised for saline environments: Designed for high-salinity waters with calibration and algorithms that compensate for salinity effects on dissolved oxygen measurement.Stable fluorescence measurement: Measures the phase difference between excited red light and reference light, avoiding oxygen consumption during measurement and eliminating electrolyte replacement.Robust IP68 construction: Rated for submerged marine environments with resistance to corrosion, salt and alkali, and operation up to 0.6MPa pressure.RS485 ModBus-RTU interface: Supports integration with PLCs, data loggers and industrial monitoring systems.Automatic temperature compensation: Built-in temperature sensing provides real-time data for compensated dissolved oxygen readings.Specifications:Power Supply: DC10-30VPower Consumption: 0.2WCommunication Interface: RS485 (Standard ModBus-RTU Protocol)Measurement Principle: FluorescenceMeasuring Range: 0-20mg/L, 0-200% SaturationMeasurement Error: ±3% FS; ±0.5°C (25°C)Resolution: 0.01mg/L; 0.1%; 0.1°CResponse Time: ≤60sOperating Temperature: 0-40°CFluorescent Film Lifespan: 1 year under normal useWaterproof Rating: IP68Pressure Resistance: 0.6MPaCable Length: 5mCasing Material: Corrosion-Resistant PlasticUseful for automated mariculture and aquaculture monitoring, DIY oceanographic data buoys, estuary and coastal water quality analysis, and industrial process control in saline solutions.","vendor":"DFRobot","product_type":"Dissolved Oxygen Sensor","in_stock":true,"options":[],"variants":[{"id":15952,"title":"Default Title","sku":"DF-SEN0681","mpn":"SEN0681","price":513.85,"on_sale":false,"in_stock":true,"available_quantity":55}]}