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The function of water conductivity sensor in water quality monitoring


Generally speaking, it is about 2000us/cm. The quality of water depends on its water quality indicators. Good drinking water quality should meet the corresponding national water quality standards. TDS is only one of many water quality indicators, TDS is mainly used to detect pure water, distilled water, RO film (reverse osmosis membrane) water purifier effluent water quality indicators. Healthy and clean drinking water must not contain pathogenic microorganisms. Chemical substances and radioactive substances in water shall not harm human health and have good sensory properties. Water quality can be monitored by water quality monitoring equipment and water conductivity sensor.

Conductivity, a physical concept. The product of the quantity and the intensity of the electric field in a medium equal to the conduction current density. It can also be called conductivity. For isotropic media, the conductivity is a scalar quantity. For anisotropic media, the conductivity is a tensor. In ecology, conductivity is the numerical ability of a solution to conduct an electric current. The units are Simon per meter (S/m).

Because water contains a variety of dissolved salts, and exist in the form of ions. When a pair of electrodes are inserted into water and a current is applied, the charged ions move in a certain direction under the action of an electric field. The anions in the water move to the anode, so that the aqueous solution plays a conductive role, the strength of the conductivity of water, called the conductivity.

PH meter
PH meter
Water conductivity sensor

Conductivity analyzer can be divided into electrode type and electromagnetic induction type according to its structure.

The electrode of the electrode type conductivity meter is in direct contact with the solution, so it is prone to corrosion, pollution, polarization and other problems, and the measuring range is limited to a certain extent. It is suitable for low conductivity (generally US /cm level, upper limit to 10ms/cm) clean medium measurement, often used in industrial water treatment device water quality analysis and other occasions.

Electromagnetic induction conductivity meter is also called electromagnetic concentration meter. The induction coil is separated from the solution by corrosion-resistant material and is a non-contact meter. So there will be no corrosion, pollution and other problems. Since there is no electrode, there is no electrode polarization problem. However, electromagnetic induction has certain requirements on the conductivity of the solution, which can not be too low. It is suitable for high conductivity (generally mS/cm level), strong corrosive, dirty medium measurement. Commonly used for concentration analysis of strong acid and alkali and sewage, paper making, medicine, food and other industries.

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