The precision and velocity of electromagnetic flow meter scale

Abstract: by illustrating the accuracy and velocity of electromagnetic flow meter scale information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. 1, precision grade, and function of the market universal electromagnetic flowmeter have bigger difference, the performance of some of the high precision and function is much, some low precision, simple functions. Basic error of high precision instrument for ( 0. 5% ~ 1%) R, low accuracy of the instrument is ( 1. 5% ~ 2. 5. More flow meter manufacturers choose model price quote you are welcome to inquire, here is the precision and velocity of electromagnetic flow meter scale article details. 1, precision grade, and function of the market universal electromagnetic flowmeter have bigger difference, the performance of some of the high precision and function is much, some low precision, simple functions. Basic error of high precision instrument for ( ± 0. ~ ± 5%; 1%) R, low accuracy of the instrument is ( ± 1. ~ ± 5%; 2. 5%) The FS, both price difference between 1 ~ 2 times. Some models the meter says it has a higher accuracy, only basic error ( ± 0. 2%～± 0. 3%) R, but there are strict installation requirements and terms of reference, such as environmental temperature 20 ~ 22 ℃ and set straight pipe length requirements respectively before and after more than 10 d, 3 d ( Usually a 5 d, 2 d) Even before and after the flow sensor is put forward to buy straight tube of a body in the flow standard device for solid flow calibration, to reduce the effect of clamp pack is not good. So in a variety of models to choose more don't just look at the high index, to read the manufacturer do comprehensive analysis of sample or specification. The function of electromagnetic flowmeter has a very big difference on the market, simple just measure the one-way traffic, only after output analog signal to drive an instrument; Multifunctional instrument with two-way flow measuring, switch range, upper and lower flow alarm, air traffic control and the power cut off alarm, cut of small signal, flow display and volume, automatic check and fault self-diagnosis, communicate with PC and motion configuration, etc. Some models of instrument serial digital communication function can choose a variety of communication interface and dedicated chip ( ASIC) To connect, PROFTBUS, Modbus, HART protocol system CONFIG, FF fieldbus, etc. 2, flow velocity, full flow, scope, degree and diameter selected meter diameter is not necessarily the same as the pipe diameter, depending on the traffic. Process industry conveying the different liquid viscosity, such as water pipe flow is usually economic velocity of 1. 5～3m/s。 Electromagnetic flowmeter in the pipeline, the sensor diameter is the same as the pipe diameter. EMF full flow when the liquid flow rate can be in 1 ~ 10 m/s within the scope of selection, range is relatively wide. Limit velocity is not restricted in principle, however, is generally recommended that no more than 5 m/s, unless the lining materials can withstand the flow scouring and actual application rarely more than 7 m/s, more than 10 m/s are more rare. Full flow velocity limit generally is 1 m/s, some models instrument is 0. 5m/s。 Some new project running in low velocity or low flow tube early, think in terms of accuracy of measurement, meter diameter should be to switch to smaller than the pipe diameter, with the reducing pipe connection. Used to have a easy adhesion, deposition and scaling substances such as fluid, selects the velocity of not less than 2 m/s, zui good up to 3 ~ 4 m/s or more, from cleaning, prevent adhesion deposition. Used for pulp and other strong abradability of fluid, commonly used flow rate should be lower than 2 ~ 3 m/s, in order to reduce the lining and the electrode wear and tear. In the measurement of near threshold low conductance of the liquid, as far as possible the selected low velocity ( Less than zero. 5～1m/s） That the flow velocity increase noise increases, while the output to shake. Electromagnetic flowmeter is relatively large, the range of degrees usually not less than 20, with a range of automatic switching function of the instrument, can be more than 50 ~ 100. Can provide domestic caliber of finished products from 10 mm to 3000 mm, with the actual application is in the majority with small diameter, but unlike most other principle of flow meter ( Such as displacement, turbine, vortex type or coriolis mass type, etc. ) Compared to large diameter instrument a large proportion of the above is all there is in this article, you are welcome to inquire me factory flowmeter selection, quotation, etc.

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