NO3 Nitrat (NO3 OPN03) - (MTI.WQMS.DRFN.NO3) absorbs ultraviolet light at 210nm. When the probe is working, the water sampleflowsthrough the slit, and when the light emitted by the light source in the probe passesthroughthe slit, part of the light is absorbed by the sample flowing in the slit, and therest of thelightpasses through the sample and reaches the other side of the probe for detectiondevicetocalculate the concentration of nitrate. Widely used in drinking water, surface water, industrial process water. In thefieldof sewagetreatment, continuous monitoring of the concentration of nitrate dissolvedinwaterisespecially suitable for monitoring sewage aeration tanks and controlling thedenitrificationprocess