product overview

The fluorescence method dissolved oxygen measuring instrument uses an innovative fluorescence method to replace traditional membrane electrodes, without the need to replace membranes and electrolytes, reducing maintenance workload and improving work reliability. It is particularly suitable for harsh working conditions in the field of sewage treatment. In addition, fluorescence sensors do not consume oxygen, so there are no requirements for flow rate and agitation, and they are not affected by substances such as sulfides.

measuring principle

The fluorescence based dissolved oxygen analyzer is based on the quenching principle of specific substances on active fluorescence in physics. The fluorescent substance at the front end of the sensor is a special platinum metalloporphyrin composite polyester foil that allows gas to pass through. The surface is coated with a black light blocking material to avoid interference from sunlight and other fluorescent substances in water. The modulated green light shines on the fluorescent substance to excite it and emit red light. Due to the quenching effect, oxygen molecules can take away energy, so the time and intensity of exciting red light are inversely proportional to the concentration of oxygen molecules. We used a red light source synchronized with green light as a reference, measured the phase difference between the excitation red light and the reference light, and compared it with the internal calibration value to calculate the concentration of oxygen molecules. After temperature compensation, we output the final value.

technical specifications

Product Features

a. Fully intelligent, multifunctional, high measurement performance, and strong environmental adaptability;

b. Fluorescence method principle, no need to replace membrane and electrolyte, basically maintenance free；

c. No need to replace the fluorescent cap, lower usage cost;

d. No oxygen consumption, no requirements for flow rate and agitation;

e. Not affected by chemical substances such as sulfides;

f. Higher resolution and measurement accuracy；

g. Chinese menu and convenient button operation；

h. 4~20mA analog current output；

i. Upper and lower limit alarm relay output；

application area

Wastewater treatment: regulating tank, aeration tank, aerobic/anaerobic digestion tank, and effluent detection, etc.

Industrial processes: production of recycled water, monitoring of water quality of recycled water, etc,Water environment testing for rivers, lakes, seawater, fishing grounds, and aquaculture.

Product manual:Fluorescence method dissolved oxygen instruction manual （Online download)

Fluorescence method dissolved oxygen (second-generation cap) instruction manual（Online download)