Full-channel box-type electromagnetic open channel flow meter

(National Patent Product:202023013410.x）

I. Product Introduction

LDM-51 Intelligent Open Channel Flow Measurement System—— Full-channel Electromagnetic Open Channel Flow MeterIsAn intelligent open channel flow meter capable of directly measuring the average velocity across the cross-section of the flow.

Full-channel box electromagnetic open-channel flow measurement system utilizing flow velocity-The area measurement principle is the fundamental method of measurement.

 The system operates by laying a full-width excitation system across the overflow section to generate a vertical full-width magnetic field. The measured potential difference, which is the result of the water flow cutting through the magnetic field, represents the collective potential of all particles across the water cross-section. Therefore, the measured flow velocity is the average velocity across the section, i.e., the average velocity of the cross-section. Multiplying the average velocity of the cross-section by its area yields the instantaneous flow rate of the channel. The area of the cross-section is a function of the water level, which can be measured using different types of level gauges, such as ultrasonic, pressure, float ball, etc.

Compared to other current flow metering methods, this system directly measures the average surface velocity, whereas the latter methods measure either line average velocity or point average velocity. Overall, the measurement accuracy of this system is higher.

 The systemOfferVarious environmentsFlow measurement solutions, capable of running onSomeIn harsh conditions, includingOpen and closed channel cross-sectional flow and velocity measurements, both regular and irregular channels。

II. Features

The measurement system can measure liquid level, average flow rate, and cumulative flow.

A reasonable mathematical model plusProcess TechnologyMulti-electrode automatic tracking measurementAvailablePrecise measurementQuantityVariousFormCross-sectional flow rate；

Measurement RangeWide(0.01-10m/s)；

Bidirectional Flow Measurement;

Measurement is not affected by floating objects and silt in water.ContentWater level fluctuationsTemperatureThe impact；

Flow rate sensors are easy to install and do not create resistance to water flow. They can be directly installed without modification to the standard cross-section, featuring low installation difficulty and cost.;

Instrument display functions: simultaneously display water level, average velocity across the cross-section, instantaneous flow across the cross-section, cumulative flow, etc.;

The matching gate can achieve precise measurement and control integration, capable of measuring water levels before and after the gate, as well as the gate's opening degree.

Data-saving feature ensures setting parameters and traffic values are retained during long-term power outages.;

Gauges featureStandardmodbus(RTU)Output485Interface, used in conjunction with dual-channel analog input interface.

III. Technical Specifications

4. Model and Specifications

Use Instructions

1、Install the location as straight as possible in the channel or river section.Choose gauge specifications close to channel width。

2、All connections of the intelligent open channel flow measurement system should be kept as short as possible, avoiding power lines whenever possible. Ensure proper waterproofing, moisture-proofing, anti-breakage, and shielding treatments for the cables to guarantee accurate and error-free connections.

3Select a flow meter with a matching diameter for gate control installation.