Application Scope and Classification of Open Channel Flow Meters

Abstract: The application scope and classification information of open channel flowmeters are provided by excellent flowmeter and flowmeter manufacturers and quotation manufacturers. Classification of open channel flow meters According to the measurement principle, open channel flow meters commonly used in industry and public utilities can be roughly divided into weir method, measuring tank method, velocity-water level calculation method and electromagnetic flowmeter method. (1) Weir method. Install a baffle at the appropriate position of the open channel to allow water to flow. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following is the application scope and classification article details of open channel flowmeters. Classification of open channel flow meters Commonly used open channel flow meters in industry and public utilities can be roughly divided into weir method, measuring tank method, flow velocity-water level calculation method and electromagnetic flowmeter method according to the measurement principle. (1) Weir method. A baffle is installed at the appropriate position of the open channel, the water flow is blocked, and the water level rises to the weir (gap) mouth at the upper end of the baffle, and then flows out from the weir mouth. The flow of water just outflow is less than the original flow in the channel, the water level continues to rise, and the outflow flow increases accordingly, until the outflow is equal to the original flow of the channel, the water level stabilizes at a certain height, and the flow can be obtained by measuring the height of the water level. (2) The flume (flume for short) method, when a part of the open flow channel is throttled, the flow velocity at that location increases, and at the same time, the water level in this part decreases. Measure the drop in the water level to obtain the flow. (3) Velocity-water level calculation level (referred to as the velocity-water level method). Measure the flow velocity of a certain part (point, line or small area) of the circulation channel, which represents the average flow velocity, and then measure the water level to obtain the flow area, multiply the coefficient between the local flow velocity and the average flow velocity, and calculate the flow rate. (4) Electromagnetic flowmeter method. It is further divided into two types: submersible electromagnetic flowmeter and non-full pipe electromagnetic flowmeter, the latter has not yet been developed in China. The submersible electromagnetic flowmeter is to set a baffle in the channel to intercept the flow, and the baffle has a hole near the bottom and is equipped with a submersible electromagnetic flow sensor. The sensor of the electromagnetic flowmeter with a non-full pipe is directly installed on the pipeline with a circular underdrain of the same diameter. The principle of measuring the flow rate is the same as that of the traditional electromagnetic flowmeter, but it also has the function of measuring the water level in the instrument. The electrode, magnetic circuit and measuring circuit have big difference. Ultrasonic flowmeter is used for the measurement of circulating water and wastewater (1) Open channel ultrasonic flowmeter is used. In view of the wide application range of liquid ultrasonic flowmeters (the outer diameter of the pipe is from 12mm to 5m, or even larger), Secco has selected several ultrasonic liquid flowmeters to measure circulating water, with pipe diameters from DN80 to DN1000. The selected instrument adopts acoustic waveguide technology, which can withstand various extreme process conditions (temperature resistance range: -200~600℃; pressure resistance range: it can be at the same level as the process flange) to measure flow. Open channel ultrasonic flowmeter is a kind of flowmeter widely used in sewage treatment plants. The flow rate of the liquid in the open channel has a definite relationship with the liquid level somewhere on the tank. For a certain shape of the tank, the flow rate can be calculated as long as the liquid level is measured. (2) Problems that should be paid attention to when installing and using open channel ultrasonic flowmeter. Due to the inherent weaknesses of ultrasonic and electronic measuring instruments, such as being susceptible to temperature, radiation, etc., improper installation and use will seriously affect their measurement accuracy and service life. The following issues should be paid attention to when installing the flowmeter: 1) In order to ensure that there is no foreign matter in the sewage flowing through the flow tank, a filter must be installed not far upstream of the flow tank. 2) In order to ensure that the sewage flowing through the flow tank is stable and has no ripples, a static water well can be set up on the side of the flow tank and communicated with the tank. The width of the straight section of the channel is greater than or equal to 10 times the width of the water surface of the weir, and the highest water level downstream is lower than the lowest water level of the weir plate. 3) The emission surface of the sensor probe should be parallel to the liquid surface, and the distance between the lower end surface of the sensor and the highest liquid level should be greater than or equal to 0.7m. 4) There should be no radiation sources such as strong light and electromagnetic fields around the sensor. 5) There should be measures to prevent rain and snow above the ultrasonic sensor. The following issues should be paid attention to when using the open channel ultrasonic flowmeter: 1) Since the places where the sewage ultrasonic sensor is installed are all places with poor environment, the main engine of the instrument should be installed indoors, and a special person should be responsible for taking care of the lines and sensors on a regular basis. Do an inspection. 2) The instrument should be regularly checked for metrology. (1) Open channel ultrasonic flowmeter is used. In view of the wide application range of liquid ultrasonic flowmeters (the outer diameter of the pipe is from 12mm to 5m, or even larger), Secco has selected several ultrasonic liquid flowmeters to measure circulating water, with pipe diameters from DN80 to DN1000. The selected instrument adopts acoustic waveguide technology, which can withstand various extreme process conditions (temperature resistance range: -200~600℃; pressure resistance range: it can be at the same level as the process flange) to measure flow. Open channel ultrasonic flowmeter is a kind of flowmeter widely used in sewage treatment plants. The flow rate of the liquid in the open channel has a definite relationship with the liquid level somewhere on the tank. For a certain shape of the tank,As long as the liquid level is measured, the flow rate can be calculated.

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