KFDO310 integrated on-line fluorescence dissolved oxygen sensor is designed and made based on the quenching principle of excited fluorescence of specific substances in physics. The blue light from the light-emitting diode illuminates the fluorescent material on the inner surface of the fluorescent cap. The fluorescent material on the inner surface is excited and emits red light. By detecting the phase difference between the red light and the blue light, and comparing it with the internal calibration value, the concentration of oxygen molecule can be calculated, and the final value can be output by temperature automatic compensation.
No electrolytes, no polarization
No need to consume oxygen, not affected by the flow rate
Built-in temperature sensor, automatic temperature compensation
Free from chemicals like sulfides
Small drift, fast response, more accurate measurement
Maintenance-free, long service life, lower use cost
Fluorescent caps are easy to replace
RS-485 interface, Modbus-RTU protocol
| Model number |
KFDO310 |
| Measuring principle |
fluorescence |
| Range |
0ー20 mg/L (0ー200% saturation, 25 °C) |
| Resolution |
0.01 mg/l, 0.1 °C |
| Precision |
± 2% f.s. , ± 0.5 °C |
| Temperature compensation |
Automatic temperature compensation (PT1000) |
| Output mode |
RS-485 bus, Modbus-RTU protocol |
| Working conditions |
0ー45 °C, < 0.2 mpa |
| Storage temperature |
- 5 ~ 65 °C |
| Installation mode |
Immersion mounting |
| Cable length |
5 meters, other length can be customized |
| Power consumption |
< 0.05 W |
| Power supply |
12 ~ 24 VDC ± 10% |
| Protection level |
IP68 |
| Calibration |
Two-point calibration |
| Fluorescent cap life |
Guaranteed Use for one year (under normal use) |
| Material for sensor housing |
Pom and 316L stainless steel |
The temperature sensing part should be immersed below the liquid surface to avoid collision with the film head surface. The head part of the membrane should be free from sediment.
Tips:
Where Does DO Come From?
How dissolved oxygen enters water
Dissolved oxygen enters water through the air or as a plant byproduct. From the air, oxygen can slowly diffuse across the water’s surface from the surrounding atmosphere, or be mixed in quickly through aeration, whether natural or man-made 7. The aeration of water can be caused by wind (creating waves), rapids, waterfalls, ground water discharge or other forms of running water. Man-made causes of aeration vary from an aquarium air pump to a hand-turned waterwheel to a large dam.
Dissolved oxygen is also produced as a waste product of photosynthesis from phytoplankton, algae, seaweed and other aquatic plants.
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