The open channel flow monitoring system integrates sensors, communication, cloud computing and other technologies to achieve real-time perception and intelligent analysis of the water flow status of open channels (such as rivers, irrigation channels, urban drainage networks)

1. Product Introduction

ML3 radar wave point online flow measurement is a fully automatic flow telemetry system that can monitor the flow process in open channels throughout the process. This flow measurement system is not affected by temperature, humidity, rainfall, water depth, turbid water, and floating objects on the water surface, making it very suitable for flow measurement in open channels such as irrigation districts and river channels.

Second, Components

Main components equipment

(1) Radar water level surface flow velocity discharge three-in-one;

(2) Remote Terminal Unit RTU;

(3) Solar power supply system;

(4) Vertical support and bracket;

(5) Lightning protection grounding.

Three, Working Principle

The radar surface flow meter is based on the principle of pulse radar technology to measure the surface flow velocity of river and channel water bodies, and at the same time, it is used in combination with the radar water level sensor, which is installed at the regular section of open channel such as river channels and irrigation districts, to calculate the flow rate, that is, to measure the speed of water flow through the section and at the same time to measure the depth of the water body, and to calculate the flow rate of water flow through the section by mathematical geometric principles.

IV. Characteristics of the flow station

The main characteristics of the radar surface flow measurement system are as follows: it uses a non-contact method to measure flow, mainly consists of a set of radar water level, flow velocity and discharge three-in-one sensor, which is suspended in the air above the channel by a vertical pole support method. By measuring the water level depth and instantaneous surface flow velocity of the regular section, the discharge passing through this section at this moment is calculated. The main characteristics are as follows:

(1) Advantages

Non-contact, can be installed with water, not limited by channel water flow, waterlogging;

No water-blocking phenomenon;

Not easily affected by debris, floating matter in the channel;

Not affected by water quality, suspended sediment content;

Suitable for channels with faster flow rates and larger volumes.

(2) Interference factors

The influence of wind speed: Wind speed can easily cause fluctuations in the water surface, leading to false alarms and mismeasurements;

Slower flow rate: When the water surface flow rate is slower, the measurement error increases;

Sandstorm weather: Sandstorm weather has a significant impact on the signal strength of radar waves, resulting in large measurement errors;

Heavy rain weather: When encountering heavy rain weather, radar waves are easily affected by the intensity of rain, resulting in large measurement errors.

5. Technical parameters

Water level measurement

測距 range: 0.1-40 meters

Range accuracy: ±5mm

Range resolution: 1mm

Time interval: 1-5000min  

Flow rate measurement

Ranging: 0.15～15m/s

Speed measurement accuracy: ±2%

Speed resolution: 0.01m/s

Traffic measurement

Discharge = Average velocity x Cross-sectional area x Correction factor

The average flow velocity is collected by the flow meter on the surface flow of the fluid and calculated by the model.

The cross-sectional area of the overflow is calculated from the water level measured by the water level gauge and the cross-sectional information.

Rainfall monitoring

Measurement range: rain intensity 0～4mm/min

Measurement accuracy: ±0.2mm

Resolution: 0.2mm

Catchment area: φ200mm

Power supply mode: Solar panel + battery combination power supply

Solar power: 100W (optional)

Battery parameters: DC3.7V 10Ah

Support height: vertical rod 3 meters, cross arm 3 meters

Working environment: -45℃～85℃ (no ice state)