1Dissolved oxygen analyzerCore requirement positioning: Clarify application scenarios and accuracy requirements
Laboratory Scene
Requirements: High precision, multi parameter synchronous display, data storage and export.
Key parameters:
Measurement range: 0-100.0 μ g/L (ppb level) to 0-20.00mg/L (ppm level), covering ultra-low oxygen and conventional detection needs.
Accuracy: ± 0.5% FS (full-scale error), resolution up to 0.01mg/L.
Function: Full Chinese LCD screen, automatic temperature compensation, 3000 sets of data storage, RS232 communication interface.
Applicable scenarios: Boiler water and environmental wastewater monitoring in thermal power plants, industrial water quality analysis (such as condensate oxygen content detection).
Industrial sites and outdoor scenes
Requirements: durability, fast response, anti-interference ability, portability.
Key parameters:
Measurement range: 0-60mg/L, resolution 0.01mg/L.
Response time: reaching 95% of the final value in 8 seconds (standard membrane), supporting "one click calibration" and air pressure compensation.
Durability: IP67 waterproof rating, cable joint can withstand 300000 bends, stainless steel probe protective cover.
Applicable scenarios: Rivers and Lakes water quality monitoring, aquaculture, sewage treatment, emergency monitoring.
Aquaculture specific scenarios
Requirements: Real time monitoring, anti pollution, low-cost maintenance, intelligent alarm.
Recommended model: Random dissolved oxygen analyzer (fluorescence method technology).
Key parameters:
Measurement range: 0-30mg/L or 0-400% saturation, supports automatic pressure and manual salinity compensation.
Technical advantages: Fluorescence measurement does not consume oxygen, does not require electrolyte, and has strong anti-interference ability.
Maintenance: Automatic calibration once a year, IP67 waterproof, with a lifespan of over 5 years.
Applicable scenarios: high-density aquaculture, nursery ponds, and industrial circular water aquaculture.
2、 Comparison of Technical Routes: Fluorescence Method vs. Coated Electrode Method
| Technical Type | fluorescence method | Membrane electrode method |
| Measuring principle | Optical induction, no need to consume oxygen | Polarization reaction, consuming oxygen |
| maintenance cost | Low (no need for electrolyte/membrane replacement) | High (requiring regular replacement of membrane and electrolyte) |
| anti-interference | Strong (unaffected by sulfides and flow rate) | Weak (susceptible to interference from H2S and bubbles) |
| lifespan | 3-5 years | 1-2 years (requiring frequent maintenance) |
| response time | Fast (usually<10 seconds) | Slow (polarization time required) |
| Applicable scenarios | Long term online monitoring and field testing | Short term laboratory testing and low-cost requirements
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IIIDissolved oxygen analyzerKey Indicator Analysis: Accuracy, Stability, and Durability Conclusion: Fluorescence method is suitable for industrial grade durability requirements, while membrane electrode method is suitable for budget limited or short-term laboratory testing.
accuracy class
Laboratory grade: ± 0.1mg/L or higher
Industrial grade: ± 0.2mg/.
Suggestion for selection: High density aquaculture or seedling cultivation scenarios require ± 0.1mg/L, while routine monitoring can be relaxed to ± 0.2mg/L.
Stability guarantee
Sensor quality: Prioritize IP67/IP68 protection level.
Environmental adaptability: The temperature compensation range should cover the actual working conditions.
Anti interference design: Fluorescence sensors (such as portable dissolved oxygen meters) can avoid chemical interference.
Durability verification
Material: 316L stainless steel probe (corrosion-resistant), titanium alloy cable sheath (pull resistant).
Calibration cycle: Fluorescence sensors support annual calibration, while coated electrode methods require monthly calibration.