DFRobot
DFRobot SEN0713 RS485 Chlorophyll Water Quality Sensor
· MPN: SEN0713
This industrial-grade chlorophyll sensor measures chlorophyll concentration in water using the fluorescence principle, making it useful for algae monitoring ...
This industrial-grade chlorophyll sensor measures chlorophyll concentration in water using the fluorescence principle, making it useful for algae monitoring in rivers, lakes, ponds, aquaculture systems and field research sites.
The probe and housing are integrated into a single waterproof unit, with fibre optic light transmission and internal filtering algorithms to help resist external light interference. It outputs both chlorophyll and relative fluorescence intensity data, so readings can be analysed against real-world water conditions.
Communication is via RS485 using the standard ModBus-RTU protocol, with tutorials provided for connecting to Arduino development boards and DFRobot LoRaWAN systems. A built-in temperature sensor provides automatic temperature compensation, and the sensor is factory calibrated so it is ready to use without further calibration.
Included in the box is the RS485 Water Quality Chlorophyll Sensor x1 and 5m sensor cable x1.
Features:
- Measurement range: 0~400 μg/L
- Resolution: 0.1 μg/L
- Accuracy: ±5% FS
- Integrated design: Integrated probe housing design
- Waterproof rating: up to IP68
- Measurement principle: Fluorescence principle with filtering algorithm
- Light interference resistance: Strong resistance to external light interference
- Built-in temperature sensor: Built-in temperature sensor
- Temperature compensation: Automatic temperature compensation to ensure measurement accuracy
- Communication interface: RS485 communication interface
- Protocol support: supports ModBus-RTU protocol
Specifications:
- Power Supply Voltage: 10~30V DC
- Power Consumption: 0.4W
- Communication Interface: RS485 (Standard ModBus-RTU protocol)
- Measurement Range - Chlorophyll: 0~400 μg/L
- Measurement Range - Fluorescence Intensity: 0~100 RFU
- Measurement Range - Temperature: 0°C~+60°C
- Measurement Accuracy - Chlorophyll: ±5%FS (25℃)
- Measurement Accuracy - Fluorescence Intensity: ±5%FS (25℃)
- Measurement Accuracy - Temperature: ±0.5°C
- Resolution - Chlorophyll: 0.1 μg/L
- Resolution - Fluorescence Intensity: 0.1 RFU
- Resolution - Temperature: 0.1°C
- 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
Suitable for algae bloom early warning, aquaculture pond monitoring, university field labs and long-term watershed research where RS485 data collection is required.
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.
- 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.
- RFU
- RFU stands for Relative Fluorescence Units, a comparative measure of how strong the fluorescence signal is. It matters because RFU readings can help track changes in water conditions, but they are not the same as an absolute chlorophyll concentration unless interpreted with calibration and context.
- 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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