Umwelt-Online-DO-Sensor Echtzeitüberwachung des gelösten Sauerstoffs im Wasser - AMT-DO300
The fluorescent membrane at the probe front is excited by blue lightLED excitation produces red fluorescence; oxygen molecules in water quench the fluorescence,The higher the oxygen concentration, the shorter the fluorescence lifetime/ The shorter the phase difference。
Produktvorstellung
Umwelt-Online-DO-Sensor Echtzeitüberwachung des gelösten Sauerstoffs im Wasser
一、工作原理
Mainstream types are divided into fluorescence quenching method (optical method, mainstream for intelligent sensors on the market) and intelligent polarographic (electrochemical) method, with the fluorescence method accounting for the vast majority.
1. Fluorescence quenching principle (optical intelligent DO）
The fluorescent membrane at the probe front is excited by blue light LED Excitation produces red fluorescence; oxygen molecules in water quench the fluorescence. The higher the oxygen concentration, the shorter the fluorescence lifetime / The shorter the phase difference. The sensor detects fluorescence lifetime, and the built-in algorithm combines temperature and salinity for automatic compensation to directly calculate dissolved oxygen concentration.
Features: measurement does not consume oxygen in water, no water flow required, no electrolyte needed, no polarization waiting time.
2. Intelligent polarographic (Clark electrode)
Based on electrochemical reduction reaction, internally integrated MCU, automatic polarization, temperature compensation, digital output; still requires electrolyte and oxygen-permeable membrane, needs a certain water flow, and maintenance workload is greater than the fluorescence method.
Umwelt-Online-DO-Sensor Echtzeitüberwachung des gelösten Sauerstoffs im Wasser
2. Basic structure
Sensing probe: fluorescent membrane cap / Electrochemical electrode core sensing unit
Integrated temperature measurement module:NTC Temperature sensor for temperature compensation; some models have built-in salinity compensation
Embedded microprocessor: signal filtering, algorithm calculation, calibration storage, fault diagnosis
Communication unit:RS 485（Modbus RTU) digital interface, some also carry 4 20mA Analogausgang
Mechanical housing:316L Stainless steel / PPS Plastic,IP68 Waterproof immersion structure; high-end version with self-cleaning mechanical brush to remove algae and sludge adhesion.
3. Main technical features
Digital intelligent processing
The sensor completes signal calculation locally, stores calibration parameters; supports automatic temperature, salinity, and pressure compensation to reduce environmental interference; comes with built-in fault self-check and abnormal alarms, and can record working status.
Convenient communication, easy to connect to the Internet of Things
标准 Modbus 协议，可直接对接 PLC, data acquisition instruments, cloud platforms, enabling remote reading and remote configuration without the need for additional transmitter signal conversion.
Low maintenance (fluorescence type)
No electrolyte, no frequent replacement of electrolyte; long calibration cycle; self-cleaning version greatly reduces manual wiping, suitable for long-term unattended online monitoring.
Measurement performance
Common ranges:0 20 mg/L; einige Versionen mit niedrigem Sauerstoffgehalt können erreichen μg/L 级别
Accuracy:±0.1~0.2 mg/L; resolution 0.01mg/L
T90 Response time:10 30s
Compared with traditional analog dissolved oxygen electrodes
表格
Projekt Traditional analog dissolved oxygen electrode Intelligent dissolved oxygen sensor
信号输出 Analog current / Voltage RS485 Digital signal,Modbus
Calculation and compensation Relies on external transmitter Sensor built-in algorithm for local compensation
Calibration data Stored in the transmitter Sensor locally stores calibration parameters
Installation and integration Complex wiring Simple wiring, directly connects to IoT systems
Self-diagnosis None Fault self-check, status feedback
Umwelt-Online-DO-Sensor Echtzeitüberwachung des gelösten Sauerstoffs im Wasser
4. Typical application scenarios
Sewage treatment: biochemical tank aerobic / Online monitoring of dissolved oxygen in anoxic zones, linked to aeration system to control fan operation.
Water environment monitoring: surface water, reservoirs, rivers, lakes buoy stations, groundwater monitoring.
Aquaculture: real-time monitoring of dissolved oxygen in fish ponds and shrimp ponds, linked to automatic aerators for intelligent aquaculture control.
Industrial processes: circulating cooling water, biological fermentation, food and pharmaceutical process water monitoring.
Seawater monitoring: supports salinity compensation, used for ocean and coastal monitoring.
Umwelt-Online-DO-Sensor Echtzeitüberwachung des gelösten Sauerstoffs im Wasser
5. Selection and usage precautions
For sewage and algae-rich water bodies, prioritize fluorescence method intelligent sensors with self-cleaning brushes to reduce drift caused by biological adhesion.
The fluorescent membrane cap is a consumable part with a normal service life 6 18 months, need to be replaced upon expiration.
Although frequent calibration is not required, it is recommended to regularly compare and calibrate with standard methods to ensure data compliance.
Installation should avoid large bubble impact to prevent bubbles from blocking the probe and causing data fluctuations.
If you need, I can help you organize a technical parameter template for intelligent dissolved oxygen sensors, for use in proposals and bids.
