About the online residual chlorine meter can be divided into free residual chlorine and combined residual chlorine
The online residual chlorine meter adopts the overall design concept of the industry, imported core components to ensure the high quality of the instrument, and also uses isolation technology, strong resistance, can choose measurement parameters and set upper and lower limits, hardware isolation, each channel can choose measurement parameters arbitrarily, hysteresis The amount can be preset. It is widely used in automatic control of circulating water dosing, swimming pool chlorine dosing control, pure water, drinking water, hospital wastewater discharge water quality monitoring and other application fields. The online residual chlorine meter uses the principle of microcomputer photoelectron colorimetric detection to replace the traditional visual colorimetric method. Human error is eliminated, so the measurement resolution is greatly improved. When measuring, when the tested water sample is put into tetramethylbenzidine or o-toluidine reagent, the water sample will turn yellow. Then put the water sample into the photoelectric colorimetric seat, and the meter will compare the shade of yellow to get the concentration of residual chlorine. The online residual chlorine meter can be divided into free residual chlorine and combined residual chlorine: The online residual chlorine meter is divided into free residual chlorine and combined residual chlorine according to the form and disinfection activity. Free residual chlorine: also known as Cl2, HOCl, OCl-, etc. in the free chlorine aqueous solution are free residual chlorine, which is a residual chlorine component with good anti-virus effect and strong oxidizing ability in water, and is generally used in sanitation and swimming pool water quality control. Free residual chlorine is used to measure whether the residual chlorine of water quality is up to standard. Combined residual chlorine: When ammonium (amine, ammonia) exists in water, chlorine will react with ammonium to produce chloramine (monochloramine, dichloramine, trichloramine). The bactericidal effect of chloramine is far weaker than that of hypochlorous acid, and it has an odor. Unwelcome ingredient in swimming pools. However, since the stability of chloramine is much stronger than that of free residual chlorine, in order to achieve long-term bactericidal effect, a certain amount of chloramine in the tap water supply system has a positive effect. Free residual chlorine and combined residual chlorine are collectively referred to as total residual chlorine. The detection methods of residual chlorine include iodometric method, DPD colorimetric method, DPD drop lake method, OTO colorimetric method (because it can cause bladder cancer, it has been banned in the United States, Europe and Australia, and China's drinking water standards have also banned the use this method) and the electrical method. Since residual chlorine solutions are extremely unstable, rapid on-site testing is recommended.