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Electromagnetic flowmeter diameter
The diameter of the electromagnetic flowmeter, the electromagnetic flowmeter is the most common instrument panel in today's industrial production flowmeter meter.Among the instruments, the precision of the measurement is the highest, and there is no obstruction in the sensor pipeline, and the interference of material temperature, viscosity and corrosion is less.
However, the selection of the diameter of the electromagnetic flowmeter will also have a certain interference to the measurement precision, so how to choose the appropriate diameter of the electromagnetic flowmeter?The little sister summed up some experience for everyone, for your reference.
(1) the diameter of the selected sensor is the same as that of the connected process pipe
The sensor is usually the same caliber as the process pipe, which is easy to install.But its premise is that the flow rate of the fluid in the tube should be within the usual range.The full-range velocity range of the general industrial electromagnetic flowmeter is 1 ~ 4m/s, which can be selected according to different measurement targets.
For example, when measuring clean water, the economic flow rate is 1.5-3m/s; when measuring crystallizable aqueous solution, the flow rate should be appropriately increased, 3-4m/s is appropriate, which has the function of self-cleaning, avoiding adhesion accumulation, etc.; when measuring slurry and other abrasion hydrodynamics, the flow rate should be reduced as far as possible, and 1-2m/s is appropriate, so as to reduce damage to lining and electrode.Practical applications rarely exceed 7m/s, and more rarely exceed 10m/s.
(2) the diameter of the selected sensor is different from that of the connected process pipe
Such selection applies to the following situations:
A. The flow rate in the pipeline is slightly lower, and the total process flow rate is relatively stable. In order to consider the scope of flow rate specified by the meter, the diameter of the sensor is selected to be lower than that of the process pipeline when the flow rate is raised in the dashboard, and the reducing pipe is added to the front and rear of the sensor.
B. In terms of price, for large diameter electromagnetic flowmeters, the larger the diameter, the higher the price.The flow rate in the pipeline is a little lower, the main parameters of the processing technology is stable, can use a small diameter sensor, which can not only make the instrument operation in a better working condition, but also reduce the cost of the instrument.
(3) refitted reducing pipe should pay attention to the problem
A. selection of taper Angle of reducing pipe
In order to install the reducing pipe after the distribution of multi-interference flow rate, without interference to the precision of the electromagnetic flowmeter, it is required that the center cone Angle of the reducing pipe should not exceed 15°, the lower the better.In this way the reducing tube can be regarded as part of the straight section.
B. refit reducing pipe will cause pressure damage (the pressure damage does not interfere with the measurement of electromagnetic flowmeter). The overall pressure damage consists of three parts:
The total pressure damage is:
Where is the material density, and the enterprise is kg/m3
Factor 1 factor 3 is for reducing pipe, the index of divergent tube is associated with Reynolds number
Factor 2 = 0.02 is the index of accurate measurement sensor tube
V1 and V2 are process pipelines, respectively. The velocity in the sensor measurement tube is m/s
Porcelain city Shanghai instruments co., LTD., has more than 30 years of technology accumulation, has a number of national invention, has been reached in many ways even more than the world leading level, such as range than can do 1 0 and the latter, temperature more than 200 c, can bear pressure 1000 bar and so on, can say we are the real benchmarking enterprise of flow meter industry in China.
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