Home ProductsWater Quality Sensor

KFDO310 Fluorescence Pom Dissolved Oxygen Sensor RS-485 Bus

KFDO310 Fluorescence Pom Dissolved Oxygen Sensor RS-485 Bus

  • KFDO310 Fluorescence Pom Dissolved Oxygen Sensor RS-485 Bus
  • KFDO310 Fluorescence Pom Dissolved Oxygen Sensor RS-485 Bus
KFDO310 Fluorescence Pom Dissolved Oxygen Sensor RS-485 Bus
Product Details:
Place of Origin: CHINA
Brand Name: kacise
Certification: CE
Model Number: KFDO310
Payment & Shipping Terms:
Minimum Order Quantity: 0-100
Price: $0-$2000
Packaging Details: Common package or custom package
Delivery Time: 3-10days
Payment Terms: L/C, D/A, D/P, T/T, Western Union, MoneyGram
Supply Ability: 100
Contact Now
Detailed Product Description
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
High Light:

Pom Dissolved Oxygen Sensor


RS-485 Dissolved Oxygen Sensor

KFDO310 Online Fluorescence Dissolved Oxygen Sensor No Electrolytes No Polarization No Need To Consume Oxygen


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

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 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

4.Dimensional Drawing


KFDO310 Fluorescence Pom Dissolved Oxygen Sensor RS-485 Bus 0





5.Installation and Electrical Connection


KFDO310 Fluorescence Pom Dissolved Oxygen Sensor RS-485 Bus 1

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:Examples of Freshwater Organisms and Dissolved Oxygen Requirements

KFDO310 Fluorescence Pom Dissolved Oxygen Sensor RS-485 Bus 2


Minimum dissolved oxygen requirements of freshwater fish

Coldwater fish like trout and salmon are most affected by low dissolved oxygen levels. The mean DO level for adult salmonids is 6.5 mg/L, and the minimum is 4 mg/L. These fish generally attempt to avoid areas where dissolved oxygen is less than 5 mg/L and will begin to die if exposed to DO levels less than 3 mg/L for more than a couple days. For salmon and trout eggs, dissolved oxygen levels below 11 mg/L will delay their hatching, and below 8 mg/L will impair their growth and lower their survival rates. ¹⁹ When dissolved oxygen falls below 6 mg/L (considered normal for most other fish), most trout and salmon eggs will die.

Bluegill, Largemouth Bass, White Perch, and Yellow Perch are considered warmwater fish and depend on dissolved oxygen levels above 5 mg/L. They will avoid areas where DO levels are below 3 mg/L, but generally do not begin to suffer fatalities due to oxygen depletion until levels fall below 2 mg/L. The mean DO levels should remain near 5.5 mg/L for optimum growth and survival.

Walleye also prefer levels over 5 mg/L, though they can survive at 2 mg/L DO levels for a short time. Muskie need levels over 3 mg/L for both adults and eggs. Carp are hardier, and while they can enjoy dissolved oxygen levels above 5 mg/L, they easily tolerate levels below 2 mg/L and can survive at levels below 1 mg/L.

The freshwater fish most tolerant to DO levels include fathead minnows and northern pike. Northern pike can survive at dissolved oxygen concentrations as low as 0.1 mg/L for several days, and at 1.5 mg/L for an infinite amount of time. Fathead minnows can survive at 1 mg/L for an extended period with only minimal effects on reproduction and growth.

As for bottom-dwelling microbes, DO changes don’t bother them much. If all the oxygen at their water level gets used up, bacteria will start using nitrate to decompose organic matter, a process known as denitrification. If all the nitrogen is spent, they will begin reducing sulfate. If organic matter accumulates faster than it decomposes, sediment at the bottom of a lake simply becomes enriched by the organic material.

Contact Details
Xi'an Kacise Optronics Co.,Ltd.

Contact Person: Sun

Tel: +8618066719759

Send your inquiry directly to us (0 / 3000)


Address: i City, No11, TangYan South road, Yanta District, Xi'an,Shaanxi,China.

Factory Address:i City, No11, TangYan South road, Yanta District, Xi'an,Shaanxi,China.