German WTW dissolved oxygen sensor FDO700IQ item number 201650

German WTW dissolved oxygen sensor FDO700IQ item number 201650

1、 Characteristics

1Adopting intelligent thin film correction(IQMC)Technology, no need for calibration；

2TheC²Light speed correction, high measurement accuracy;

3Green light technology(GLT)The fluorescent cap has a long lifespan；

4Equal path length reference systemEPRSStable measurement without drift；

5、45Degree design, not affected by bubbles；

6No filled electrolyte;

IIworking principle

（1）A layer of fluorescent dye is covered on the thin film at the top of the sensor. When a short wavelength light is irradiated onto the fluorescent dye, it emits long wavelength red light when it returns from the excited state to the ground state. The red light is the test signal. The higher the concentration of dissolved oxygen, the shorter the duration of red light. By testing the duration of red light, the concentration of dissolved oxygen can be determined. The first generation of fluorescence based dissolved oxygen sensors had the following drawbacks:

1、The longer the film is in contact with water, the greater the signal drift

2、Fluorescent dyes are prone to aging after exposure to blue light

3、Sensors are more sensitive to bubbles

（2）WTWby virtue of60Years of manufacturing experience have successfully overcome the above difficulties and launched the second-generation fluorescence based dissolved oxygen sensor. The technological advantages of second-generation sensors are mainly reflected in the following aspects:

1TheIQMCtechnology:Each diaphragm undergoes strict calibration before leaving the factory, and the calibration data is stored in the chip on the diaphragm.

2TheEPRSEqual optical path reference system:The testing optical path and reference optical path, as well as the symmetry of the optical path system, can synchronously eliminate the influence of optical component aging. Ensure high testing accuracy within the lifespan of the sensor.

3TheGLTGreen light technology:Green light has relatively less energy compared to blue light, which can avoid the fading effect of fluorescent dyes and extend the service life of the film, usually achieving2Years of lifespan.

4、45Degree testing technology:The top of the sensor does not adopt a flat structure, but has a45The slope of the degree can avoid the accumulation of bubbles, thus solving the problem of the first generation being easily disturbed by bubbles.

5、C²Light speed correction calibration:The fluorescence method ultimately boils down to the issue of testing time, thereforeWTWThe time testing system is strictly calibrated according to the physical constant of light speed, ensuring accurate time testing.

WTWHaving the above technological advantages, thereforeFDOFluorescence based dissolved oxygen sensors do not require calibration during use,Simultaneously possessing high measurement accuracy and stability, it brings great convenience.

3、 Sensor structure

（1）Storage chip: There is a storage chip on the fluorescent cap of the sensor that can store the following data: fluorescent cap type, serial number, and factory calibration data.

（2）IQMCTechnology: Each fluorescent film undergoes strict calibration before leaving the factory, and the calibration data is stored on a chip to ensure the highest accuracy of the sensor during use.

4、 Outline dimension diagram

5Technical Specifications

6、 Ordering Information

SW: Sea WaterApplication of seawater;SACIQdedicatedcableOrder separately

（German WTW dissolved oxygen sensor FDO700IQ item number 201650）