Open Channel Flow Monitor

1.Open Channel Flow Monitor Product Introduction

Open Channel Flow Monitor is mainly composed of four parts: Doppler flow meter, data acquisition, communication network and software platform. Doppler flow meter is a sensor that measures the velocity and flow of water in natural water bodies. Doppler flow meter is divided into two parts: sensor and host.

The sensor has two transducers, one for transmitting and one for receiving. When the sensor is facing the direction of the water flow, that is, under the premise of countercurrent measurement:

1. When the water flow is still, the received frequency is the same as the transmitted frequency.

2. The faster the flow rate, the faster the frequency received by the receiving sensor will be, which will be higher than the transmitting frequency.

3. The slower the flow rate, the slower the frequency received by the receiving sensor, but it will be higher than the transmitting frequency.

When the sensor measures along the direction of water flow:

1. When the water flow is still, the received frequency is the same as the transmitted frequency.

2. The faster the flow rate, the faster the frequency received by the receiving sensor, but it will be lower than the transmitting frequency.

3. The slower the flow rate, the slower the frequency received by the receiving sensor, but it will be lower than the transmitting frequency.

From the above, the water flow rate and direction can be calculated through hardware and software.

2. How Open Channel Flow Monitor works

Product flow rate measurement is based on the Doppler effect. The probe emits a beam of ultrasonic waves obliquely upward. When the ultrasonic wave contacts impurities or bubbles in the fluid, the reflected ultrasonic wave will produce a Doppler frequency shift Δf. The Doppler frequency shift Δf is proportional to the fluid flow rate. By measuring the Doppler frequency shift Δf, the flow rate V of the fluid can be measured.

The product measures liquid level based on a pressure sensor. The fluid cross-sectional area S can be automatically calculated through the set channel parameters. Based on the velocity-area method, the liquid flow rate Q can be measured.

Q = V × S

Features

lUsing ultrasonic Doppler principle to measure flow velocity and measurement, with high accuracy and small environmental restrictions;

l The velocity area method is used to measure flow, which does not require the construction of weirs and has low construction costs;

l High integration, supporting simultaneous measurement of flow rate, liquid level, instantaneous flow, cumulative flow and temperature;

lEquipped with temperature sensor to compensate for the influence of water temperature on sound velocity;

l Built-in circular, rectangular, trapezoidal, triangular and other pipeline models, convenient for debugging;

lBionic appearance design effectively reduces garbage occlusion;

lLow power consumption design; operating current is less than 25mA; suitable for battery or solar power supply.

3. Open Channel Flow Monitor Parameters

4. How to use Open Channel Flow Monitor

1. Installation requirements

Water quality requirements: According to the measurement principle, the water to be tested must contain certain tiny impurities or bubbles, but there should not be too much floating objects in the water to avoid interference.

Water flow requirements: It should be installed downstream of a straight section with a fixed cross-section. The length of the straight section should preferably be 5-10 times the hydraulic radius of the channel (the longer the straight section, the higher the measurement accuracy). There should be no flow obstacles (such as sluices, weirs, etc.) within this distance to ensure the uniformity and stability of the water flow in front of the probe.

2. Installation diagram

5. Introduction to Open Channel Flow Monitor Cloud Platform

1.CS architecture software platform, supports direct observation via mobile phone and PC browser, no need to install additional software.

2.Support multiple accounts and multiple devices login

3.Support real-time data display and historical data display dashboard

4. Cloud servers and cloud data storage are stable and reliable, easy to expand, and load balanced.

5.Support SMS alarm and threshold setting

6.Support map display and view device information.

7.Support data curve analysis

8.Support data export in table format

9.Support data forwarding, HJ-212 protocol, TCP forwarding, http protocol, etc.

10. Support data post-processing function

11.Support external running of javascript scripts