Dissolved oxygen sensor for aerobic tank of organic wastewater

1. Product introduction of dissolved oxygen sensor for aerobic tank of organic wastewater

This fluorescence-based dissolved oxygen sensor uses optical fluorescence detection principles, differing from traditional membrane electrode products. It requires no electrolyte and no frequent membrane head replacement, enabling long-term online monitoring of dissolved oxygen content in water. The sensor features automatic temperature compensation, a built-in digital processing chip, and stable, reliable output. Its corrosion-resistant housing and high protection rating allow it to adapt to complex water environments such as wastewater, surface water, and aquaculture water. It is widely used in aquaculture, municipal wastewater treatment, river ecological monitoring, drinking water plants, and industrial wastewater treatment, enabling real-time continuous online monitoring of dissolved oxygen in water, providing accurate data support for water quality control, aeration energy saving, and water environment management.

2. Working principle of dissolved oxygen sensor for aerobic tank of organic wastewater

The fluorescent substance at the front of the sensor is excited by a light source at a specific wavelength to produce fluorescence, and oxygen molecules in the water inhibit the duration of the fluorescence. The device calculates the dissolved oxygen concentration in the water by detecting the fluorescence decay time, unaffected by water flow disturbance or impurities such as sulfides, providing stronger measurement stability and longer maintenance cycles. A built-in temperature probe automatically compensates for data deviations caused by temperature, ensuring accurate and effective measurement results under different water temperature conditions.

3. Technical features

1. Optical fluorescence detection, no electrolyte, low maintenance cost, reducing later consumable investment;
2. Built-in temperature compensation, high measurement accuracy, and fast response speed;
3. Corrosion-resistant cylindrical housing, waterproof and corrosion-resistant, supporting long-term submerged installation;
4. Digital RS485 Signal output for easy integrationPLC, acquisition terminals, online monitoring systems;
5. Resistant to interference from impurities in wastewater, and not easily affected by water acidity, alkalinity, or slight oil contamination;
6. Flexible installation methods, including immersion, pipeline, and bracket fixed installation.

4. Installation and usage instructions

1. Before installation, check that the sensor appearance is free of damage and the front fluorescence cap is intact without scratches or stains;
2. Fix the sensor on a bracket with the probe vertically immersed below the water surface, avoiding bottom sludge and areas with strong direct aeration impact;
3. Connect the power supply and signal wires according to the wiring definitions, and confirm that the supply voltage meets equipment specifications;
4. For initial use, perform calibration, and use the air calibration method for quick calibration;
5. Start the device, wait for the sensor to warm up and stabilize, then read real-time dissolved oxygen data.

5. Maintenance and care

1. Regularly clean the sensor probe surface with clean water, and avoid scratching the fluorescence membrane with hard objects;
2. For working conditions with turbid water and heavy sludge, it is recommended to clean probe attachments once a month;
3. When not in use for extended periods, clean, dry, and store in a dry, cool place;
4. The fluorescence cap is a consumable part; after its service life expires, simply replace the accessory directly without replacing the entire unit.

6. Precautions

1. Avoid the sensor probe hitting hard objects to protect the front fluorescence detection surface;
2. Do not use for long periods in water bodies with strong corrosive chemical agents;
3. During wiring construction, ensure waterproofing is handled properly to prevent water ingress into the terminal causing faults;
4. If abnormal data occurs, first check probe cleanliness and calibration status.

7. Application scope

Suitable for online monitoring of water environments such as aquaculture oxygenation control, municipal wastewater aeration tank process control, black and odorous river ecological monitoring, drinking water source monitoring, industrial circulating water, and printing and dyeing wastewater, supporting intelligent water quality management.