DFRobot
DFRobot RS485 Fluorescence Dissolved Oxygen Sensor - Freshwater
· MPN: SEN0680
This optical dissolved oxygen probe is designed for measuring DO levels in freshwater environments such as aquaculture tanks, rivers, lakes, reservoirs and t...
This optical dissolved oxygen probe is designed for measuring DO levels in freshwater environments such as aquaculture tanks, rivers, lakes, reservoirs and treatment facilities. It uses fluorescence quenching, measuring the phase shift of light caused by oxygen molecules, rather than relying on an electrochemical electrolyte-based cell.
The sensor provides dissolved oxygen concentration and saturation readings over RS485 using the standard ModBus-RTU protocol, making it suitable for PLCs, data loggers and industrial monitoring systems. A built-in temperature sensor applies automatic temperature compensation to help keep readings reliable as water conditions change.
The unit is built for long-term field deployment with an IP68 waterproof rating and support for continuous submersion in freshwater conditions. It comes factory-calibrated and supports user-defined zero-oxygen and full-scale calibration via registers for optimisation.
Included in the box is one RS485 Fluorescence Dissolved Oxygen Sensor for freshwater and one sensor cable. A product wiki is available from the manufacturer for setup and register information.
Features:
- Maintenance-free fluorescence principle: Optical measurement does not consume oxygen or rely on electrolytes.
- Automatic temperature compensation: Integrated temperature sensing compensates each measurement in real time.
- RS485 ModBus integration: Supports standard ModBus-RTU protocol for connection to data platforms, PLCs and data loggers.
- Factory-calibrated: Supplied calibrated for straightforward deployment.
- User calibration support: Supports user-defined zero-oxygen and full-scale calibration via registers.
- IP68 waterproof design: Suitable for continuous submersion in demanding freshwater environments.
- Freshwater aquaculture: Monitor DO levels in fish ponds and tanks to optimise stock health.
- Wastewater treatment: Control aeration processes for efficient biological treatment.
- Environmental monitoring: Deploy in rivers, lakes, and reservoirs for long-term water quality data logging.
- Scientific research: Gather accurate dissolved oxygen data for environmental studies.
- Smart agriculture and hydroponics: Ensure optimal oxygen levels in irrigation and nutrient solutions.
Specifications:
- Power Supply: DC10-30V
- Power Consumption: 0.2W
- Communication Interface: RS485 (Standard ModBus-RTU Protocol)
- Measurement Principle: Fluorescence
- Measuring Range: 0-20mg/L, 0-200% Saturation
- Measurement Error: ±3% FS; ±0.5°C (25°C)
- Resolution: 0.01mg/L; 0.1%; 0.1°C
- Response Time: ≤60s
- Operating Temperature: 0-40°C
- Fluorescent Film Lifespan: 1 year under normal use
- Waterproof Rating: IP68
- Pressure Resistance: 0.6MPa
- Cable Length: 5m
- Casing Material: Corrosion-Resistant Plastic
A strong choice for freshwater aquaculture, wastewater treatment, hydroponics, smart agriculture, research and long-term environmental water quality monitoring.
Jargon buster
Plain-language definitions for the technical terms used above.
- Modbus
- Modbus is an industrial communication protocol used by many meters, sensors, PLCs, and automation devices. Modbus support matters because it can make the controller easier to integrate with existing industrial equipment.
- ModBus-RTU
- ModBus-RTU is a common industrial protocol for sending sensor readings and control commands over serial links such as RS485. Knowing the sensor uses ModBus-RTU helps you choose software libraries, data loggers, or controllers that can request and interpret its readings.
- RS485
- RS485 is a robust wired serial communication standard often used in factories, farms, and buildings where cables may be long or electrically noisy. It matters because it lets this controller connect to industrial sensors, meters, and control equipment over longer distances than typical hobby serial wiring.
- Temperature compensation
- Temperature compensation means the sensor adjusts its readings to reduce errors caused by changes in water temperature. This matters for field monitoring because ponds, rivers, and tanks can vary in temperature throughout the day and across seasons.
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