Industrial flow meter selection analysis

Abstract: Industrial flow meter selection and analysis information is provided by excellent flow meter and flow meter manufacturers and quotation manufacturers. Abstract: There are many types of flow meters in the industrial production process. In the actual application selection, the safety of the flow detection device, the working conditions of the measuring medium, the accuracy of the meter, the economy and other factors should be fully considered. Through the above comprehensive consideration Make a reasonable choice. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following is the details of the article on the selection and analysis of industrial flowmeters. There are many types of flow instruments in the industrial production process. In the actual application selection, the safety of the flow detection device, the working conditions of the measuring medium, the accuracy of the instrument, and the economy should be fully considered. Reasonable selection. Keywords: flow meter, type selection, medium working condition, meter accuracy At home and abroad, the throttling device represented by the orifice plate, the nozzle and the venturi tube was used as the flow measurement element, and the differential pressure flowmeter was composed of a pressure guiding tube and a differential pressure transmitter, and this was used as the measurement standard, that is, Without the need for experimental calibration, the relationship between differential pressure and flow can be determined by looking-up table calculation, and its measurement error can be estimated. With the development of science and technology, new flow detection instruments have been rapidly promoted and applied. According to their principles, they are divided into differential pressure flowmeters, positive displacement flowmeters, turbine flowmeters, electromagnetic flowmeters, float flowmeters, vortex flowmeters, and ultrasonic flowmeters. Meters, mass flowmeters, flowmeters with different principles correspond to different media and working conditions, and all factors should be considered in the practical selection. 2 Flowmeter measurement principle and application range 1) Differential pressure flowmeter. The differential pressure flowmeter is composed of a differential pressure transmitter and a throttling device. The flow value is confirmed by measuring the static pressure difference generated when the medium flows through the throttling device. It is the earliest measurement method, and its throttling device has formed a standard [1]. Standard throttling devices are represented by orifice plates, nozzles and venturi tubes. With the optimization and improvement of throttling devices, various non-standard throttling devices have been widely used and promoted. It can measure liquid, gas, steam and other media, adapt to a variety of environments, and is widely used in metallurgy, petrochemical, electric power and other industries. 2) Positive displacement flowmeter. Positive displacement flowmeters use mechanical measuring elements to continuously divide the fluid into a single known volume portion, and measure the total volume of the fluid according to the number of times the measuring chamber is repeatedly filled and discharged. The positive displacement flowmeter has high processing cost and large volume. It has no special requirements for the front and rear straight pipe sections. It is suitable for clean single-phase fluids and can be used for the measurement of high viscosity liquids (oil and natural gas) with high precision. Not suitable for high and low temperature occasions, regular calibration is required. 3) Turbine flowmeter. When the fluid flows through the sensor housing, the impulsive force of the fluid makes the blades rotate. Under certain conditions, the rotational speed is proportional to the flow rate, and the flow rate of the fluid can be obtained by measuring the rotational speed of the turbine. The turbine flowmeter has strict installation requirements. It is best to install it horizontally on the pipeline. The installation site requires no strong electromagnetic interference and heat radiation sources. It is suitable for clean gas and liquid, the accuracy level is higher than 0.2, the price is more expensive, and it is not suitable for high and low temperature occasions. 4) Electromagnetic flowmeter. The principle of electromagnetic flowmeter is based on Faraday's law of electromagnetic induction. The electromagnetic flowmeter is not affected by external factors such as temperature, pressure, viscosity, and weight. The flowmeter body has no moving parts and is not affected by the fluid. There are no shrinking or protruding parts in the measuring tube, and there is no pressure loss to the fluid. The best choice for the measurement of conductive liquids, and it can also measure conductive media such as sewage, slurry fluid, solid-liquid two-phase, and corrosive. The electromagnetic flowmeter has a wide measurement range and high measurement accuracy, generally 0.5 class. 5) Float flowmeter. The detection element of the float flowmeter is composed of a vertical conical tube that expands from bottom to top and a float group that moves up and down along the axis of the conical tube. The float moves up and down, and the flow value is calculated from the position of the float. The rotameter is suitable for the measurement of small pipe diameter, low flow rate and small flow. The float flowmeter has a simple structure, low price, low precision, and it is easy to use on-site indication flow. 6) Ultrasonic flowmeter. The principle is to measure the flow velocity of the fluid by measuring the difference between the velocity of the ultrasonic pulse propagating in the upstream and countercurrent flow. The installation requirements of the flowmeter are strict, the distance between two points is required to be precise, and the straight pipe section is required to be long. It is a non-contact instrument and is suitable for measuring fluids that are not easy to touch and observe, as well as large-diameter flow, such as sewage, open channels and other fluids. Not suitable for high temperature (200 ℃) medium, low precision (grade 1 to 1.5). 7) Vortex flowmeter. Vortex flowmeters use the principle of fluid oscillation to measure flow.

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