When it comes to sewage treatment, it belongs to the process industry. The commonly used detection instruments in such process industries are those that measure parameters such as temperature, pressure/pressure difference, flow rate, and water level, all of which are applicable to water treatment projects. This chapter mainly aims to introduce to you all the online detection and analysis instruments for sewage.

The water quality detector is not only useful for water environment detection or sewage discharge detection, but also necessary for sewage treatment and engineering restoration. The specific detection instruments required are as follows: water routine five parameters (pH/ORP, dissolved oxygen DO, turbidity/particulate matter concentration SS, conductivity and water temperature) detector, online chemical oxygen demand (COD), biochemical oxygen demand (BOD), ammonia nitrogen (NH3-N), total phosphorus (TP), total nitrogen (TN), total organic carbon (TOC) analyzer, etc.

Among various water quality detectors, the measurement principles they adopt also involve many fields of study, such as physics, chemistry, microbiology, botany, ecology, toxicology, and so on. The successful production and formation of product instruments and meters are also the result of the synthesis of multiple modern high-tech fields such as microelectronics, mechanics, network technology, information technology, and control technology.