Industrial flow instrument selection analysis

Abstract: the industrial flow instrument selection analysis information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. Abstract: in the process of industrial production flow meter sort is more, in the practical application of selection should fully consider the safety of the flow test device, the operation condition of the measured medium, the accuracy of the instrument, economy and other factors, through the comprehensive consideration make reasonable choice. More flow meter manufacturers choose model price quote you are welcome to inquire, below is the industrial flow instrument selection analysis for details. Flow meter sort is more, in the process of industrial production in the practical application of selection should be fully considered when the safety of the flow test device, the operation condition of the measured medium, the accuracy of the instrument, economy and other factors, through the comprehensive consideration make reasonable selection. Keywords: flow meters, selection, working condition of medium and instrument accuracy 1 introduction flow parameters is one of the four important parameters in industrial production process, is also a zui difficult measurement parameters. Zui early at home and abroad is the orifice, nozzle and venturi tube as the flow measurement device, represented by the throttle device with a guide pipe and the differential pressure transmitter, differential pressure type flowmeter as measurement standard, namely without calibration experiment, through the look-up table calculate and determine the differential pressure and flow rate, the relationship between and can estimate the error of measurement. With the development of science and technology, the new type of rapid flow detection instrument is widely used, according to the principle of the differential pressure flowmeter, volumetric flowmeter, turbine flowmeter, electromagnetic flowmeter, flow meter, vortex flowmeter, ultrasonic flowmeter and mass flowmeter, different principles for different medium and conditions of the flow meter, the practical selection to synthetic factors into consideration. 2 meter measuring principle and application scope of 1) Differential pressure type flowmeter. Differential pressure flowmeter is composed of differential pressure transmitter and throttling device, by measuring the static pressure difference when the medium flows through the throttle device to confirm the flow value, it is early zui way of measuring the throttling device has formed standard [1]. Standard throttle device with orifice, nozzle and venturi tube, as the optimization of the throttle device improvement, all kinds of non-standard throttling device has been widely used and promoted. Can measure liquid, gas, steam and other medium, adapt to various environment, and is widely used in metallurgy, petrochemical, electric power and other industries. 2) Volumetric flowmeter. Volumetric flowmeter is the use of mechanical measuring element to divide fluid continuously into the volume of a single known part, according to the measuring chamber of successive repeatedly the number of full of emissions and the volume of fluid to measure the total fluid volume. Volumetric flowmeter processing cost is high, the volume is larger, the straight pipe before and after no special requirements, single-phase fluid to clean and can be used for high viscosity fluid measurement ( Oil and natural gas) And high precision. Does not apply to high and low temperature situation, need to calibration on a regular basis. 3) The turbine flowmeter. When the fluid flows through the sensor shell, fluid force makes the blade rotation, under certain conditions, the speed is proportional to the velocity of flow, by measuring the turbine speed can be fluid flow. Turbine flowmeter installation requirements strictly, zui good level on the pipeline installation, the installation place without strong electromagnetic interference and thermal radiation source. Adapted to the clean gas, liquid, precision grade higher than 0. Level 2, the price is more expensive, does not apply to high and low temperature. 4) Electromagnetic flowmeter. Electromagnetic flowmeter is based on Faraday's law of electromagnetic induction principle. Electromagnetic flowmeter is not affected by external factors such as temperature, pressure, viscosity, severe impact, flowmeter ontology has no moving parts, are not affected by the influence of the fluid, the measuring tube without shrinkage or protruding parts, the fluid pressure loss, electromagnetic flowmeter is a conductive liquid measurement zui preferred choice, but also can measure sewage, slurry flow, solid liquid two phase and corrosive conductive medium. Electromagnetic flowmeter measurement range, high measuring accuracy, generally is 0. Level 5. 5) Flow meter. Flow meter detecting element is composed of a root from bottom to expand the vertical tapered tube and a move up and down along the cone shaft of float group, the current body from the bottom up through the cone tube and float ring crack changes lead to float up and down, by the position of the float to calculate flow value. Flow meter is suitable for small diameter and low flow rate, small flow rate measurement. Flow meter has simple structure, low price, low precision, the instructions flow is convenient to use. 6) Ultrasonic flowmeter. Its principle is determined by measuring the ultrasonic pulse travels downstream and upstream speed to measure the difference between the flow velocity of the fluid. Flowmeter installation requirements strictly, accurate to two distance requirement, also require a long straight pipe, belong to the non-contact instrument, suitable for the measurement is not easy to contact and observation of fluid and reduce the amount of runoff, such as wastewater, such as fluid flow in open channel. Not suitable for high temperature ( 200℃） Medium and low accuracy, 1 ~ 1. Level 5) 。 7) Vortex flowmeter. Vortex flowmeter is applied fluid oscillation principle to measure the flow. Vortex flowmeter is suitable for measuring liquid, gas or steam, wide measurement range, measurement accuracy is higher, 0. 5 to 1) 。 When volume flow measurement conditions affected by the fluid properties change little, measurement of medium temperature can reach 400 ℃, a long straight section of the requirements of the vortex flowmeter, pipeline installation cannot have vibration, fluid flow for the pulsating flow.

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