DFRobot
DFRobot Industrial RS485 Blue-Green Algae Sensor
· MPN: SEN0714
This industrial-grade water quality probe measures blue-green algae, also known as cyanobacteria, in water using the fluorescence principle. The probe and ho...
This industrial-grade water quality probe measures blue-green algae, also known as cyanobacteria, in water using the fluorescence principle. The probe and housing are integrated into a single waterproof unit for straightforward deployment in rivers, lakes, ponds and other monitoring sites.
It uses a fibre optic light path design with a filtering algorithm to help resist external light interference. The sensor is factory calibrated before shipping, so it is ready to use without further calibration.
Data is output over RS485 using the standard ModBus-RTU protocol. DFRobot provides tutorials for connecting the sensor to Arduino development boards and DFRobot LoRaWAN setups, making it suitable for real-time monitoring and long-term IoT environmental data logging.
The package includes the RS485 Water Quality Blue-Green Algae Sensor and a 5m sensor cable.
Features:
- Measurement range: 0~400 μg/L
- Resolution: 0.1 μg/L
- Accuracy: ±5% FS
- Integrated probe housing design: waterproof rating up to IP68
- Fluorescence principle with filtering algorithm: strong resistance to external light interference
- Built-in temperature sensor: automatic temperature compensation to ensure measurement accuracy
- RS485 communication interface: supports ModBus-RTU protocol
Specifications:
- Power Supply Voltage: 10~30V DC
- Power Consumption: 0.4W
- Communication Interface: RS485 (Standard ModBus-RTU protocol)
- Measurement Range - Cyanobacteria: 0~300,000 cells/ml
- Measurement Range - Temperature: 0°C~+60°C
- Measurement Accuracy - Cyanobacteria: ±5%FS (25℃)
- Measurement Accuracy - Temperature: ±0.5°C
- Resolution - Cyanobacteria: 1 cell/ml
- Resolution - Temperature: 0.1°C
- Linearity: R²>0.999
- Temperature Compensation Range: 0°C~+60°C
- Response Time: ≤30S
- Operating Temperature: 0°C~+40°C
- Measurement Principle: Fluorescence method
- Waterproof Rating: IP68
- Pressure Resistance: 0.6MPa
- Cable Length: 5m
- Housing Material: Corrosion-resistant plastic
Useful for harmful algal bloom early warning, aquaculture water monitoring and remote ecological research with LoRaWAN nodes.
Jargon buster
Plain-language definitions for the technical terms used above.
- Fluorescence method
- A fluorescence method measures how a substance emits light after being excited by another light source. For a chlorophyll sensor, this matters because it estimates algae-related chlorophyll levels optically rather than by a chemical test strip or lab sample.
- IoT
- Short for Internet of Things, meaning physical devices that connect to networks or the internet to send data or be controlled remotely. It matters if you want projects such as connected sensors, remote controls or classroom data-logging activities.
- 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.
Supplier page — dfrobot.com
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