Instructions for Online Water Quality Analyzer
With the increasing emphasis on environmental protection, sustainable use of water resources, and water safety worldwide, online water quality analysis instruments and their application technologies have gained tremendous development opportunities as the source technology for obtaining water quality information, in order to meet the increasingly strict environmental regulations and the growing demand of the water treatment industry market in various countries around the world. At the same time, advances in computer science, analytical chemistry, materials science, and other related scientific and technological fields have provided reliable technical support for the development of online water quality analysis instrument technology. The predecessor of the International Water Association (IWA), the International Association for Water Pollution Research (IAWPR), has been organizing specialized conferences on the theme of ICA (Instrumentation, Control and Automation) since 1973, specifically promoting and researching the application of online water quality analysis instruments and process control in the field of water treatment.
Description of online water quality analyzer
Throughout the years, online water quality analysis instrument technology has developed simultaneously in two aspects: research and manufacturing technology for online analysis instruments and application technology for online water quality analysis instruments. According to the definition of ISO standards, there are two forms of online water quality analysis instruments: online analysis sensors and more complex automated analysis equipment or devices. The online water quality analysis instruments often appear in the form of online analysis sensors and display controllers. The instrument usually has a relatively simple structure and obtains water quality index data through direct contact between the sensor and the measured water sample. The initial measurable water quality indicators mainly include some simple physical and compositional indicators, such as water temperature, conductivity PH、ORP、 Dissolved oxygen, etc; Next are sensors based on optical principles such as turbidity and suspended solids concentration; With the development of electrochemical analysis technology, online water quality analysis sensors based on various ion selective electrode principles such as fluoride ions, ammonium ions, nitrate ions, etc. have also begun to enter the market. Due to the direct contact between sensors and water samples, sample pretreatment and removal of interfering substances cannot be carried out as in laboratory manual analysis. Its applicability is greatly limited when facing water samples with complex water quality (high temperature, high pressure, oil content, sulfides, heavy metals, suspended solids, high salinity, corrosive gases, and other impurities). The initial measurement objects are mainly surface water, drinking water, municipal sewage, and industrial pure water, which have relatively simple water quality conditions.
Types of online water quality analyzers
Thirdly, with the development of materials science, the environmental adaptability of online water quality analysis instrument sensors has also been greatly improved. This is reflected in the adoption of high-temperature materials, which continuously increases the high operating temperature range of the sensors; The sensor material is made of inert materials, which can withstand probes contaminated with hydrogen sulfide, sulfide, high salt, heavy metals, and oil in water. The probe can also withstand dissolved oxygen and dissolved hydrogen from high-intensity nuclear radiation and is used in nuclear power plants; Using titanium alloy material, it can be applied to sensors for ocean monitoring for a long time, and so on.
