Water quality standard of Jiangmen drinking water machine

2021-04-06 303

In general, pure water quality is judged by conductivity, while ultra pure water quality is measured by resistivity. Simply speaking: pure water is based on the amount of medium in water to reflect the conductivity of medium to monitor water quality, while the medium in ultra pure water is not only non-conductive, but also has enough resistance and higher purity. The calculation formula of conductivity is as follows: X is the conductivity, f is the Faraday constant, CI is the concentration of certain ions, Zi is the charge number of ions, UI is the ion mobility, the formula is: x = f ∑ ciziui theoretically, the conductivity of ultrapure water without ions in Jiangmen drinking water machine is 0.055 μ s / cm at 25 ℃. The resistance is the reciprocal of the conductivity. Then r = 1 / x, 1 / 0.055 = 18.1818 is about 18.2 m Ω. Cm. Generally, we can not accurately measure the resistivity or conductivity of ultrapure water off-line. When ultra pure water is exposed to the external environment, it will be polluted by the external environment. The air in the laboratory contains a large number of ions, which can enter into ultra pure water, thus affecting the quality of ultra pure water. In addition, the instruments used to measure conductivity (beaker, resistivity meter / probe) will also bring in ionic pollutants. As shown in the calculation formula of conductivity, the increase of any ion will affect the conductivity value, because the type of conductivity ion is directly proportional to its charge.

江门饮水机

Therefore, the water quality monitoring of ultrapure water is on-line monitoring, and the data obtained by Shenzhen Shijun ultrapure water machine when it is working is correct. In other words, it is only when the machine is working and ultrapure water is active that the resistivity of water can be measured correctly. It is not accurate when it is still, or when the flow is small or the activity is insufficient.

Article source: Jiangmen water dispenserhttp://www.jmhz-union.com

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