Maintenance and application of innoCon 6800D fluorescent dissolved oxygen analyzer

Due to high cost performance and superior quality, fluorescence dissolved oxygen analyzer innoCon 6800D is widely used in sewage and wastewater treatment. We combine some of the characteristics of the product to share some basic knowledge, calibration and precautions of the fluorescence method.




Measurement principle: Fluorescence method is based on the principle of fluorescence quenching. Blue light is irradiated onto the fluorescent substance to excite the fluorescent substance to emit red light. Since oxygen molecules can carry away energy (quenching reaction), the time and intensity of red light are excited. It is inversely proportional to the concentration of oxygen molecules. The concentration of oxygen molecules is calculated by measuring the phase difference between the excited red light and the reference light and corresponding to the internal calibration value.


Benefits of Fluorescence Dissolved Oxygen and Traditional Membrane Method Dissolved Oxygen:

1. There is no need to replace the membrane head and electrolyte regularly, and almost no maintenance is required.

2. Excellent performance, easy to use, no oxygen consumption.

3. This analyzer can be applied to a variety of harsh environments, including dead water without a flow rate, aeration tank, etc.


Installation Notes:

1. Fluorescence dissolved oxygen sensor should avoid exposure to sunlight or refracted light. Avoid using in organic solvents that emit light, such as acetone, chloroform, toluene, and chlorine, which affect the measurement of fluorosensors. It is recommended to be installed upstream of chlorination.

2. Bubbles in water (such as aeration tanks) can interfere with the measurement of fluorescent dissolved oxygen,so the the sensor can be installed at a 45° angle.

3. The sensor's fluorescent cap should not be rubbed against hard objects, or wiped with force. It can be cleaned gently with soft paper or cotton.

4. The sensor isnot allowed to be completely immersed in water. The immersion installation method can use the mounting bracket. The joint must be covered with tape to prevent the sensor from immersing in water and causing damage.


How to calibrate:

1. Saturated air calibration: Calibrate the sensor in saturated air. Or immerse the sensor in clean water for 10 minutes, take it out and put it in the air. When the value is stable, perform automatic calibration (refer to the comparison table of temperature and dissolved oxygen).

2. Zero point calibration: The factory has zero calibration before leaving the factory. Users can also perform zero calibration by configuring anhydrous sodium sulfite solution.


Maintenance and replacement:

We recommend replacing the fluorescent cap once a year.


Industry Applications:

Widely used in sewage, wastewater treatment, surface water, aquaculture and other industries.