1.Principle
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.
2.Feature
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
3.Technical Specifications
| 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 consumpt. | |
| Fluorescent cap life | Guaranteed Use for one year (under normal use) |
| Material for sensor housing | Pom and 316L stainless steel |
4.Dimensional Drawing
5.Installation and Electrical Connection
Installs
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:Dissolved Oxygen Saturation
dissolved_oxygen_stratification-decomposition
Not all water depths reach 100% air saturation
In a stable body of water with no stratification, dissolved oxygen
will remain at 100% air saturation. 100% air saturation means that
the water is holding as many dissolved gas molecules as it can in
equilibrium. At equilibrium, the percentage of each gas in the
water would be equivalent to the percentage of that gas in the
atmosphere – i.e. its partial pressure . The water will slowly
absorb oxygen and other gasses from the atmosphere until it reaches
equilibrium at complete saturation 10. This process is sped up by
wind-driven waves and other sources of aeration .
In deeper waters, DO can remain below 100% due to the respiration
of aquatic organisms and microbial decomposition. These deeper
levels of water often do not reach 100% air saturation equilibrium
because they are not shallow enough to be affected by the waves and
photosynthesis at the surface. This water is below an invisible
boundary called the thermocline (the depth at which water
temperature begins to decline).
