Abstract: the accuracy of meter scale and other meter scale how classification information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. In practice, the selected instrument accuracy is the same case, considering the actual measurement of flow range of values, as far as possible compression meter range interval of zui close to measured values in order to improve the measurement precision. And with a ruler than 1 cm. More flow meter manufacturers choose model price quote you are welcome to inquire, here is a meter scale and other meter scale details how the accuracy of the classification of the article. In practice, the selected instrument accuracy is the same case, considering the actual measurement of flow range of values, as far as possible compression meter range interval of zui close to measured values in order to improve the measurement precision. And 1 cm by the ruler will be a little bit more accurately than with metric scale quantity is a reason. For electromagnetic flowmeter, for example, the universal performance on the market have bigger difference, some high precision, function, 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. So the measurement accuracy requirement is high place ( Non-trade accounts only for the purpose of control, for example, electromagnetic flow meter with high reliability and excellent repeatability is only required to place) Choose high precision instrument on the economy is not economical. 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 straight pipe length requirements respectively before and after more than 10 d and 3 d ( Usually a 5 d and 2 d) Straight pipe before and after, and even the flow sensor is put forward to form a whole in the flow standard device for solid flow calibration, to reduce the loading effect. So in a variety of models to choose more don't just look at the high index of vortex flow meter to read the manufacturer do comprehensive analysis of sample or specification. EMF function on the market difference is big, 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) , turbine flowmeter, PROFTBUS, Modbus, to connect the HART protocol system CONFIG, FF fieldbus, etc. Is the premise of using the EMF measured liquid must be conductive and not lower than the threshold ( The lower limit value) 。 Electrical conductivity is lower than the threshold will produce measurement error can't even use, even change can be measured more than threshold, little change of error of indication, universal threshold in 10 - EMF The 4 ~ ( 5× 10 - 6) S/cm between, depending on the model. When using also depends on sensors and switches between flow line length and its distributed capacitance, usually in factory operating instructions conductivity signal corresponding to the length. Above is all there is in this article, you are welcome to inquire me manufacturer flowmeter selection, quotation, etc.
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