1. Measurement principle
The ultraviolet light emitted from the pulsating light source irradiates the colorimetric cell, and the NO in the sample solution flowing in the colorimetric cell absorbs some of the ultraviolet light. The transmitted light intensity is detected by two ultraviolet photodiodes with different detection wavelengths. After the two signals are processed internally by the instrument and compared with the calibrated values, the concentration value of NO is calculated by the instrument. The 4-beam testing method is used, and special correction functions are added to compensate for the effects of sample chromaticity, optical lens contamination, etc. Therefore, this analysis module has good long-term stability and accuracy.
2. Typical applications
Denitrification process monitoring in sewage treatment plants, continuous effluent monitoring, organic pollution level SAC monitoring (OS210), inlet and outlet monitoring
3. Advantages and Characteristics
Principle of 4 beam testing, automatic background compensation
No reagent method
Continuous

Company Information:
Thermo Fisher Scientific is a globally influential manufacturer of portable field monitoring, online, and laboratory water quality analysis instruments, as well as a high-quality supplier of integrated water quality monitoring system solutions. As an expert in the field of water environment monitoring, Xylem Analytics has integrated its YSI SonTek、WTW、OI、Aanderaa、Tideland、HYPACK、MJK、Ebro、B S、SI、GlobalWater Professional brands and product lines effectively cover various sub segments of physical, chemical, and biological testing in water environments. To this day, our products are contributing to the water quality monitoring industry in over 150 countries worldwide, including marine environment, surface water, sewage/wastewater, municipal environmental protection, medicine, food and beverage.