Fluorescence method dissolved oxygen meter is based on the physics principle of the specific active substance quenching of fluorescence. Modulated green light it shines on the fluorescent substance excited, and emits red light, since the oxygen molecules can take away energy (quenching effect), so excited is inversely proportional to the time and intensity of the red light and the concentration of oxygen molecules. We use a red light and green light synchronization as a reference to measure the excitation phase between the red and the reference light, and with the internal calibration values ​​and compared to calculate the concentration of molecular oxygen, and temperature compensated output the final value. Dissolved oxygen (DO), the evaluation of water self-purification capacity. High dissolved oxygen content, indicating that self-purification ability of water; on the contrary represents less susceptible to oxidation decomposition of pollutants in water, then the anaerobic fungus will multiply, make the water smell. Widely used in industry, agriculture, scientific research, environmental protection and other fields. 
Features: 
Fluorescence quenching principle, little maintenance; 
Do not consume oxygen, no flow rate and agitation requirements; 
Sulfide and other chemical substances is not interference; 
High resolution and accuracy; 
Sensors Plug & Play, automatic identification; 
Simple key operation; 
4 ~ 20mA isolated current output; 
Upper and lower alarm relay output; 
All intelligent, high versatility, measurement performance, environmental adaptability.

Applications: 
Sewage Water treatment plant: regulation tank, aeration tank, aerobic / anaerobic digestion tank and finished water detection. 
Industrial process: process water, recycling water quality monitoring. 
Rivers, lakes, sea, fishing and other water aquaculture environmental testing.

Test performance: 
Measuring range: 0 ~ 20mg / L 
Air saturation 0 to 200% 
Accuracy: ± 0.1mg / L 
Resolution: 0.01 mg / L 
Response time: 30s 
Calibration: two-point calibration, field calibration 
Temperature compensation: Automatic temperature compensation 
Display: LCD display, multi-screen display parameters 

. Signal output: 
Analog output: 4 ~ 20mA, maximum load 750Ω 
Switch output: 2 sets of programmable relays can be set to alarm 
And timing 
Relay capacity: AC230V, 5A 

powered by: 
Power supply: AC220V ± 10%, 50Hz 

Physical properties: 
Material: Transmitter: PC 
Sensor: 316 shell / polyester fluorescent cap 
Process connection: G1 pipe thread 
Installation: Bracket Submersible 
Cable length: 10 meters 

Environmental Performance: 
Protection class: IP65 Transmitter 
Sensor IP68 
Working temperature: -20 ~ 55 ℃ Transmitter 
Sensor 0 ~ 60 ℃ 
Humidity: Relative humidity ≤85% 
Process pressure: ≤0.3MPa

Selection coding LOD9500

Example: LOD9500M1-SCO200: Wall-Fluorescence method dissolved oxygen meter host, input sensors.