Open Channel Flow Monitor

1.Introduction to Open Channel Flow Monitor Products

Open Channel Flow Monitor is a device used to measure the flow rate of liquids in open channels such as rivers, streams and irrigation pipes.Open Channel Flow Monitor mainly consists of four parts: Doppler flowmeter, data acquisition, communication network and software platform.Doppler flowmeter is a sensor that measures the flow rate and flow rate of water in natural water bodies.Doppler flowmeter is divided into two parts: sensor and host.

The sensor has two transducers, one transmits and one receives.When the sensor is facing the direction of the water flow, that is, countercurrent measurement:

1.When the water flow is stationary, the received frequency is the same as the transmission frequency.

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

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

When the sensor measures along the direction of the water flow:

1.When the water flow is stationary, the received frequency is the same as the transmission frequency.

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

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

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

2.Working principle of Open Channel Flow Monitor

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

The product measures the liquid level based on the 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

lUltrasound Doppler principle is used to measure flow velocity and measurement, with high accuracy and small environmental limitations;

lThe flow rate is measured by the velocity area method, without the need to build weir troughs, and the construction cost is low;

lHigh integration, supports simultaneous measurement of flow rate, liquid level, instantaneous flow, cumulative flow and temperature;

l comes with a temperature sensor to compensate for the influence of water temperature on sound speed;

l Inlaid various pipeline models such as circles, rectangles, trapezoids, and triangles, making it easy to debug;

lBionics appearance design effectively reduces garbage obstruction;

l Low power consumption design; working current is less than 25mA; suitable for battery or solar power supply.

3.Open Channel Flow Monitor parameter indicators

4.How to use Open Channel Flow Monitor

1.Installation requirements

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

Water flow state requirements: It should be installed downstream of the straight section with a fixed section.The length of the straight section is preferably 5-10 times the channel hydraulic radius (the longer the straight section, the higher the measurement accuracy), and there must be no overflow barriers (such as sluice gates, weirs, etc.) within this distance to ensure the uniform and stable flow state of the water flow state in the front section of the probe.

2.Installation diagram

5.Introduction to Open Channel Flow Monitor Cloud Platform

1.CS architecture software platform, supports direct observation of mobile phones and PC browsers without additional software installation.

2.Support multiple accounts and multiple devices to log in

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

4.Cloud server and cloud data storage are stable and reliable, easy to scale, and load balancing.

5.Support SMS alarm and threshold settings

6.Support map display and viewing device information.

7.Support data curve analysis

8.Support data export table form

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

10.Support data post-processing function

11.Support external running of javascript scripts