The water hardness online monitoring instrument is a new generation of fully automatic water hardness online monitoring instrument developed based on China's water hardness testing standard method. This product is a maintenance free online monitoring instrument launched by our company on the basis of years of research on water quality analysis products. Suitable for water softening monitoring, reverse osmosis systems, filtration and mineral removal process control, widely used in industries such as pharmaceuticals, steel, semiconductors, drinking water treatment plants, canning plants, drinking water distribution networks, swimming pools, cooling circulating water, and water quality treatment engineering.

The calcium ions in the water sample are replaced with magnesium ethylenediaminetetraacetic acid to release magnesium ions. Then, a buffer solution with pH 10 is added to react with the released magnesium ions in the water sample. The absorbance of the purple red substance is measured at a certain wavelength, and the concentration of the water sample is calculated.