The development of agriculture is inseparable from water conservancy irrigation, so water conservancy flow measurement is indispensable.
The ultrasonic flowmeter is based on the average flow velocity of the water multiplied by the cross-sectional area of the channel. The water flow rate is generally measured by installing an ultrasonic flowmeter in a specific pipe.
There are generally three measurement methods: one is the velocity distribution method; the second is the 0.6H method; the third is the 0.2H~0.8H method.
The velocity distribution method uses an ultrasonic flowmeter to select different points between the surface and bottom of the canal to measure the flow rate, and then the velocity curve of these measuring points perpendicular to the water surface is divided by the area defined by the velocity curve by the depth to calculate the average velocity of the water flow; the 0.6H method measures the flow velocity of a single point 0.6H deep below the water surface, and assumes that this value is the average value of all velocities; the 0.2H~0.8H method measures the flow velocity at two points 0.2H and 0.8H deep below the water surface. The average of these two readings can be estimated as the average flow velocity value.
All three measurement methods use ultrasonic flowmeters to measure the average velocity of water flow in a specific area. The measurement results obtained by selecting different measurement points may be different. European countries require at least 5 points to be measured during measurement, while the United States believes that 2 points are sufficient. The number of depth measurements depends on the width of the channel. The number of depth measurements in Europe is 5 to 15, and in the United States it is 8 to 18. The measurement error is determined by the number of depth measurements and the measurement time at each point. The average error using the velocity-area method can be less than 6%.
Ultrasonic technology calculates the flow rate by measuring the propagation time of ultrasonic waves across the channel. The transmitter and receiver are placed on both sides of the channel so that the angle between the wave path and the water flow direction is in the range of 45° to 60°. This geometric relationship creates a time difference between the sound pulses in the upstream and downstream directions. In practical applications, considering various conditions such as the use environment, most people still use ultrasonic flowmeters for measurement.
Gentos quick measure ultrasonic flow meter F3CL\F3RO adopts the ultrasonic transit time measurement principle, combined with Gentos patented flow algorithm technology, it realizes accurate measurement of the fluid flow in the pipe.
The product is all-in-one and clip-on structure design, which is simple and convenient to install. Only four steps are needed all along. The installation process requires no contact with fluid media and no need to shut down. The standard configuration of the product is the RS485 communication interface commonly used in industrial occasions. With MODBUS protocol, it can realize remote monitoring and data transmission ofinstruments.