I. Overview

The LDW series electromagnetic water meter is a battery powered electromagnetic induction water meter. The battery powered LDW series electromagnetic water meter can be installed in specific locations without the need for a main power source, while ensuring accuracy and performance. It is specifically designed for individual water applications such as water intake, pipeline distribution, metering and charging, and irrigation. It has intelligent information and high measurement performance, is easy to install and saves user investment, bringing users a new water experience. The LDW series direct reading electromagnetic water meter displays instantaneous and cumulative flow on site. It is powered by batteries and does not require external power. It uses a high-definition LCD screen for intuitive and convenient measurement, and is maintenance free. Application areas: Monitoring and measurement of water volume in secondary water supply networks, large water users, zoning metering, and network leakage monitoring.

2、 Product Features

This instrument is easy to install and can be installed in a well. The design of IP68 (NEMA 6P) is not affected by the installation position of the instrument in the pipeline and does not require a filter;

Low pressure loss, the straight through measuring tube ensures minimal pressure loss, even at high flow rates. It can reduce the pressure on the entire network system, which helps prevent pump station pressure from being too high, leading to pipeline rupture and leakage;

Zero maintenance, designed with no moving parts, and a battery life of up to 6 years;

Bidirectional measurement, which can achieve bidirectional flow measurement with only one instrument;

Intelligent instruments can achieve leak detection, data logger functions, and error self checking with just one instrument.

3、 Working principle

According to Faraday's principle of electromagnetic induction, a pair of signal electrodes are installed on the tube wall perpendicular to the axis of the measuring tube and the magnetic field lines. When the conductive liquid moves along the axis of the measuring tube, it cuts the magnetic field lines and generates an induced potential. This induced potential is detected by two detection electrodes, and its value is proportional to the flow rate. Its value is:

E=B⋅V⋅D⋅K

In the formula: E-induced potential;

K - Coefficient related to magnetic field distribution and axial length;

B-Magnetic induction intensity;

V-average flow velocity of conductive liquid;

D-electrode spacing (measuring the inner diameter of the tube);

K - Coefficient related to magnetic field distribution and axial length;

The sensor uses the induced potential E as a flow signal, which is transmitted to the converter. After signal processing such as amplification, transformation and filtering, the instantaneous flow rate and cumulative flow rate are displayed. And the corresponding data can be output through RS485 and GPRS.

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