1、 Measurement principle

FDO 700 IQThe fluorescent dissolved oxygen probe is covered with a layer of fluorescent dye on the thin film at the top. When a short wavelength light is irradiated onto a fluorescent dye, the fluorescent dye emits long wavelength red light when it returns from the excited state to the ground state, which 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.

C2Light speed calibration: Fluorescence method is ultimately a matter of testing time, thereforeWTWThe time testing system is strictly calibrated according to the physical constant of light speed, ensuring accurate time testing.

2、 Typical applications

water/Wastewater, especially suitable for testing and controlling dissolved oxygen in the biochemical treatment stage of sewage treatment plants.

3、 Advantages and Characteristics

（1） TheIQMCTechnical calibration free

Each film undergoes strict calibration before leaving the factory, and the calibration data is stored in the chip on the film.

（2） TheEPRSEqual optical path reference system

The test optical path and reference optical path, as well as the complete symmetry of the optical path system, can synchronously eliminate the influence of optical component aging, ensuring high testing accuracy during the service life of the sensor.

（3） TheGLTGreen light technology

Green light has less energy compared to blue light, which can avoid the fading effect of fluorescent dyes and extend the service life of fluorescent caps.

（4） The45Degree testing technology

The top of the sensor does not adopt a flat structure, but is designed as45Tilt the angle to avoid the accumulation of bubbles and solve the problem of bubble interference.

4TECHNICAL INDEX