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Electromagnetic flowmeter selection guide

by:Sincerity     2020-06-29
Electromagnetic flowmeter is selected to ensure that correctly with the premise of good electromagnetic flowmeter. Should choose what kind of electromagnetic flowmeter is based on the current body to determine the physical properties and chemical properties of the medium, the sizes of electromagnetic flowmeter, flow range, lining materials, electrode materials and the output current, etc. , can adapt to be the nature and properties of flow and flow requirements. Fluid can be measured by the principle of electromagnetic flowmeter, electromagnetic flowmeter measurement can choose flow of fluid must be conductive, strictly speaking, in addition to the high temperature fluid, as long as the electrical conductivity is greater than 5 & mu; Any fluid/cm chooses the corresponding electromagnetic flowmeter to measure flow, so there is no conductive gas, steam, oils, acetone and other material can't choose electromagnetic flowmeter to measure flow rate.

1) Determine the sensor size of

flowmeter using the velocity of the best in 0. 3 - Within the scope of 15 m/s, this time the meter diameter can choose pipe size is consistent with the users. Using the velocity is lower than 0. Had better be in when 3 m/s instrument parts local improve velocity, method of using shrinkage tube:

reducer at the center of the cone Angle is not greater than 150 degrees, reducer can be regarded as part of the straight pipe.

A size or A separate type of choose A size

B: site environment better circumstances, generally choose A size, namely the sensor and converter assembly into one.

separation type: sensor and converter packed separately in different locations, if you develop any of the following general separated type selection.

(1) the environment temperature or flowmeter converter surface radiation temperature of more than 60 oc.

[2] the occasion of pipe vibration is larger.

(3) to severe corrosion sensors aluminum shell.

(4) the temperature is larger or corrosive gas.

5] flowmeter installs or high in the sky and the debugging is not convenient.

when you order it should indicate the converter separation distance of the sensor, generally no more than 100 m, converter for wall hung installation.

2) The choice of grounding electrode, ring materials

should be according to the fluid being measured corrosive to select electrode material, manual, please check the corrosion test should be done for special fluid material corrosion resistance of

3) Lining material selection description

should be based on corrosion resistance, wear resistance and temperature of the measured medium to choose lining materials.

4) The choice of flow range

maximum flow and minimum flow must conform to the number in the table below.

5) Installation location choice

in order to make the transmitter work stable and reliable, the following aspects should be paid attention to when choosing the location of the requirements:

(1) try to avoid the ferromagnetic objects and has a strong electromagnetic field devices ( Such as big motor, transformer, etc. ) , lest affect the work of

sensor magnetic and traffic signals.

should be installed in a dry and ventilated place, should not be installed in damp, easy seeper place.

(3) avoid weathered, avoid environmental temperature above 60 ℃ and relative humidity greater than 95%.

(4) choose to facilitate maintenance, convenient place.

5] flowmeter should be installed in the pump back end, never. . . on the suction side of the installation; The valve should be installed in the flow downstream.

6) Installation requirements

to you the correct measurement, the following points should be paid attention to when choosing line position requirements:

(1) sensor can be installed on the straight path, also can be installed in horizontal or inclined pipe, but requires two electrodes at the center of the connection is in a state level.

2 medium in the installation position should be full pipe flow, are attached to the electrode to avoid than full pipe and gas.

(3) for liquid-solid two-phase fluids, vertical installation, had better use made attrition uniform in the sensors, prolong service life.

(4) install location medium disaffection tube flowmeter, flow can take up half the backend line method, make its full package, it is forbidden to install the meter in a highest point and the outlet pipe.

5] modifies the pipeline installation method:

when the velocity of the medium can not meet the requirements, should choose relatively small diameter flowmeter, then you should use different pipe diameter taper pipe or modify part, make its caliber with sensors, but straight pipe before and after shall meet at least: straight pipe before & ge; After 5 dn, straight pipe & ge; 2DN( DN

for pipe diameter)

[6] flowmeter for straight pipe before and after former & ge; 5 dn, back-end & ge; 2 dn meter connection

- if a fission installation connection of signal cable using customized special cables, cable is broken better

medium can choose Yz - excitation cable cabtyre cable, its length and the signal cable as

- signal cable must be separated from the power of the other strictly, not in the same pipe laying, unequal, laying shall be twisted together in a single steel pipe.

- and excitation signal cable cable as short as possible, redundant cable volume can not be together, redundant cable shall be cut off, and good weld joint again

- electrical interface cable into the sensor, made U at port, this will prevent rain infiltrate the sensor.

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