E-mail: michael@shboqu.com   |   Expert in Water Quality Measurement and Water Treatment Project

Online residual chlorine meter for continuous monitoring and control

by:BOQU     2022-01-26

The online residual chlorine meter is a measuring instrument composed of a sensor and a secondary meter. It can measure residual chlorine, pH value, temperature, etc. at the same time. It is widely used in electric power, waterworks, hospitals and other fields.

Online residual chlorine meter adopts imported components and permeable membrane head, based on new polarographic analysis technology and advanced production technology and surface mount technology. The use of this series of advanced analysis techniques ensures the stability, reliability and accuracy of the instrument's long-term work. With Chinese menu operation, communication and other functions. It is used in drinking water treatment plants, drinking water distribution networks, swimming pools, cooling circulating water, water quality treatment projects, etc. to continuously monitor and control the residual chlorine content in aqueous solutions.

Measuring principle of online residual chlorine meter:

The electrolytic solution and the permeable membrane separate the electrolytic cell and the water sample, and the permeable membrane can selectively allow ClO to penetrate; there is a fixed potential difference between the two electrodes, and the generated current intensity can be converted into the residual chlorine concentration;

On the cathode: ClO+2H+2e→Cl+H2O

On the anode: Cl+Ag→AgCl+e

Since there is a fixed conversion relationship between HOCl, ClO and residual chlorine under certain temperature and pH conditions, residual chlorine can be measured in this way

Main features of online residual chlorine detector:

Large-screen dot-matrix liquid crystal display, menu operation in Chinese and English.

Multiple parameters are displayed at the same time: residual chlorine value, hypochlorous acid value, pH value, temperature, output current, etc. are displayed at the same time, which is intuitive and easy to read, and has a range overrun prompt.

It has the function of restoring factory settings and slope correction.

Manual/automatic pH compensation function and temperature compensation function.

Communication function: with the RS-485 communication interface (partially compatible with the MODBUS protocol), the residual chlorine value corresponding to 4~20mA current output can be set arbitrarily.

Optical isolation 4-20mA current output.

The function of hysteresis can be set arbitrarily to avoid frequent action of the switch relay, and it has the function of setting the switch off and off.

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