Velocity area method flowmeter| analog dissolved oxygen sensor

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Do you know several methods for measuring flow in irrigation areas?

There are several methods for measuring flow in irrigation areas, including the water level gate opening characteristic curve method. Applicable scenarios include the construction of lead and rubber monitoring points near the dry rise of water gates, as well as scenarios where the channel water surface has a certain width and gate control, such as a channel water surface width of 50 meters and a 3-hole gate.. Principle: Calculate the flow rate based on the characteristic curve of the opening of the water level locust gate (distinguishing between submerged flow and free flow). Supporting equipment and data transmission: The radar water level gauge is used to read the water level before and after the gate, and the gate position gauge measures the gate height. The data is transmitted to the cloud through a telemetry terminal using GPRS. Customers can remotely issue control instructions to the local PLC through computer web software based on the existing water level and gate position, thereby controlling the gate opening or the start stop of the pump station water pump. Doppler ultrasonic flowmeter flow measurement method: Applicable scenarios: monitoring points in channels with flat water surfaces but inconsistent surface and bottom flow velocities, and deeper water. According to the width of the channel surface, choose to use single or double vertical monitoring methods. For example, if the channel water surface is 10 meters wide, the single vertical flow measurement method can be used. Principle: Doppler ultrasonic flowmeter flow velocity measurement is based on the Doppler effect. The probe emits a beam of ultrasonic waves obliquely upwa

rds, and the ultrasonic waves propagate in the fluid. Impurities such as bubbles or particles contained in the fluid (consistent with the water flow velocity) will cause a Doppler frequency shift Δ f in the reflected ultrasonic waves. The Doppler frequency shift Δ f is proportional to the flow velocity, and the flow velocity can be measured by measuring Δ f. The velocity area method is used to measure flow, and the ultrasonic flow velocity sensor is used to measure the flow velocity V, while the pressure type water level gauge is used to measure the water level H. The channel parameters are pre-set in the controller, and the controller automatically converts the flow area S based on the water level. The flow rate is calculated according to the flow formula Q=V × S (where Q is the instantaneous flow rate, V is the flow velocity, and S is the flow area), which is applicable to any shape of cross-section. Supporting equipment and data transmission: Use Doppler ultrasonic flowmeter to measure channel water flow, and send flow information to the server through telemetry terminal. Surface velocity method for flow measurement: Applicable scenarios: monitoring points with gentle channel water flow (above 0.3m/s) and consistent surface velocity and channel bottom velocity, and shallow water. Principle: Real time radar wave flow measurement system, depending on the flow velocity of the monitoring section, sets up one or more radar flow meter probes to monitor the surface flow velocity of the water flow in real time. Calculate the flow area based on the relationship between water level and cross-section, and multiply the flow velocity by the flow area to obtain the flow rate. At the same time, water quality probes can be installed

Velocity area method flowmeter

Do you know several methods for measuring flow in irrigation areas?

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