Intelligent dissolved oxygen water quality sensor dissolved oxygen online detector - AMT-DO300

Intelligent dissolved oxygen water quality sensor online dissolved oxygen detector

The intelligent dissolved oxygen water quality sensor is aFluorescence quenching principleA digital optical sensor used for real-time, continuous measurement of dissolved oxygen (DO) concentration in water-1-3. Its biggest difference from traditional electrochemical sensors (such as polarographic or galvanic methods) is:No electrolyte consumption, no membrane replacement, no frequent calibration, and not affected by water flow rate

Intelligent dissolved oxygen water quality sensor online dissolved oxygen detector

Core technical principle: Fluorescence quenching method

The core of the sensor is covered withFluorescent sensitive filmOptical probe (containing fluorescent substances such as ruthenium complexes)-2-10. Its working process is as follows:

1. Excitation: The built-in LED light source inside the device emits light of a specific wavelengthBlue light, irradiating the fluorescent film-2-4。

2. Fluorescence generation: Fluorescent substances are excited and emitRed light-2-4。

3. Quenching effect: When dissolved oxygen molecules in water contact the fluorescent film, they "quench" the fluorescence, i.e., take away energy, causing the red light toDecreased intensity, shortened lifetime-2-10。

4. Signal and calculation: The sensor detects the intensity or lifetime change of red light, followingStern-Volmer equation, combined with built-inTemperature, salinity, and air pressure compensationAlgorithm to accurately calculate dissolved oxygen concentration

5. Intelligent dissolved oxygen water quality sensor online dissolved oxygen detector

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   Traditional electrode method, intelligent fluorescence method sensors have significant advantages, which can be summarized in Table 7-10 below:

   Characteristic dimension Intelligent fluorescence method sensor Traditional electrochemical method sensor
   Measurement principle Physical fluorescence quenching, no chemical reaction-2-7 Electrode oxidation-reduction chemical reaction-2
   Consumables No electrolyte required, no membrane replacement needed-4-5 Requires regular replenishment of electrolyte, replacement of membrane and electrode-7
   Calibration and maintenance Basically maintenance-free, fluorescence cap life up to more than 2 years-3-4-5 Requires frequent calibration, electrode easily contaminated and aged-7
   Affected by flow rate Not affected, stable measurement-4-10 Requires certain flow rate, consumes oxygen when stationary causing errors-4
   Anti-interference capability Strong, not affected by sulfides, heavy metals, etc.-4-7 Weak, easily contaminated by sewage and chemicals-7
   Response speed Fast (T90 usually <60 seconds, can reach 3-5 seconds)-7-8 Slower, requires polarization time-7
   Signal output Intelligent digital output (RS485 Modbus), easy to integrate-3-6 Mainly analog signal (4-20mA)
   Measurement accuracy High, e.g., ±0.1mg/L @ <5ppm-4-5 Greatly affected by environmental interference, accuracy prone to drift

7. Intelligent dissolved oxygen water quality sensor online dissolved oxygen detector

8. 🌊 Typical Application Scenarios

9. Due to its outstanding stability, low maintenance, and anti-interference capability, intelligent dissolved oxygen sensors are widely used in multiple fields-10:

   Wastewater treatment: Monitoring dissolved oxygen in aeration tanks and anoxic tanks to optimize aeration control, ensure biological treatment efficiency, and save energy-5-10.

   Aquaculture: Real-time monitoring of dissolved oxygen levels in fish ponds and shrimp ponds, linked with aeration equipment to prevent losses due to hypoxia-5-10.

   Environmental monitoring: Used for water quality assessment and ecological health monitoring of surface water (rivers, lakes) and drinking water sources-10.

   Industrial process control: Used for closed-loop dissolved oxygen control in pharmaceutical, chemical fermentation tanks, and food and beverage industries-5.

   Power industry: Monitoring dissolved oxygen in boiler feedwater and circulating cooling water to prevent equipment corrosion-11.

   📊 Key Technical Parameters (Typical Values)
   Parameters vary slightly between different models and manufacturers, but are usually within the following ranges-3-5-6:

   Parameter item Typical indicator
   Measurement range 0～20.00 mg/L (or 0～200% saturation)
   Resolution 0.01 mg/L
   Measurement accuracy ±0.1 mg/L (when <5 mg/L) or ±1%-2% of reading
   Temperature compensation Automatic compensation (0～50℃), some support salinity compensation
   Response time T90 < 60 seconds (some high-end models can reach within 30 seconds)
   Communication interface RS485 (Modbus RTU protocol), some also support 4-20mA
   Supply voltage DC 12V/24V
   Protection rating IP68 (can work submerged for long periods)
   Sensor material 316L stainless steel / titanium alloy and other corrosion-resistant materials
   🔍 Selection and Usage Recommendations
   Confirm measurement range: Select appropriate range based on application scenario (e.g., surface water or high-concentration industrial water).

   Consider maintenance convenience: Prioritize models with long fluorescence cap life (e.g., 2 years) and support for self-cleaning brushes to significantly reduce later maintenance costs-3-5.

   System integration requirements: Confirm whether the sensor signal output (RS485 Modbus) is compatible with your PLC, SCADA systems-6-9.

   Environmental adaptability: In harsh water quality (e.g., high salinity, strong corrosion) environments, choose a full titanium alloy or 316L stainless steel shell and confirm IP68 protection rating-5-8.