BS EN ISO Measurement of conductive liquid flow in closed conduits – Method using electromagnetic flowmeters. BS EN ISO Measurement of conductive liquid flow in closed conduits. Method using electromagnetic flowmeters. standard by British. Home; ISO File Size: 1 file, MB; Same As: BS EN ISO , BS EN ISO Document History. ISO
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Subscription pricing is determined by: Part 2BS A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. Contact the Information Centre. In particular, direct solar irradiation shall be avoided.
The 8617 of the random and systematic errors may therefore be treated as though all were truly random and, according to the ISOthe relative standard deviation of the flow-rate measurement may be taken as the square root of the sum of the squares of the relative standard deviations arising from the various sources.
Your consent to our cookies if you continue to use this website. Part 1BS The faster, easier way to work with e. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Royal Danish Academy of Science and Letters. Subscribing members of BSI are kept up to date with standards developments and receive substantial discounts on the purchase price of standards.
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Copyright Copyright subsists in all BSI publications. Describes the principle and main design features of industrial electromagnetic flowmeters both a. The manufacturer should state the maximum permissible torque.
You can download and open this file to your own computer but DRM prevents opening this file on another computer, including a networked server. This standard is not included in any packages. Instructions in relation to electrical grounding of the flowmeter system shall een rigidly observed. Such electrodes, however, are more prone to fouling, introducing additional errors. If, in this case, the mean axial velocity corresponding to the maximum flow-rate is less than that recommended by the manufacturer, a primary device with a smaller hs should be used.
BSPart 1, London. It may be used continuously or intermittently. The system produces an output signal proportional to 6871 flow-rate or average velocity. Modern electronic components make it possible for input impedance of the secondary device to be several orders of magnitude greater than that of its predecessors. When measuring the flow rate of an rna further problem is that because of the relatively low ion mobility, conductivity is likely to be affected by the flow, making it a function of velocity.
Locations close to electrical equipment which may interfere with the flow measurement signal, or locations where currents may be induced in the primary device, should lso avoided. General guidance on the function and installation of secondary devices is presented in 7. General guidance on various aspects of the primary device is set out in 7. This method is becoming less commonly used in modern electromagnetic flowmeters.
We recommend that you check the website of the publishers of the international dn before making a purchase. Usually, a reference signal from the primary device—which is proportional to the magnetic flux—is compared in the secondary device with the flow signal.
Thus the velocity and hence the flow-rate of the liquid may be measured. It covers their installation, operation, performance and calibration. An additional benefit is that the is is continually reestablished, avoiding the earlier problems associated with zero drift [Baker ].
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When designing the piping system, access for installing and removing the primary device as well as access to the electrical connections should be provided. This will be indicated in the amendment table on the inside front cover. It is essential that the primary device is correctly aligned on the pipe axis when it is bolted into the pipework.
Remember me Forgot password? The electromagnetic flowmeter consists of a primary device and one or more secondary devices. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member.
Systematic errors cannot be reduced by repeating measurements, since they arise from the characteristics of the measuring apparatus, the installation and the flow characteristics. Minimum operational conductivity requirements should be obtained from the ixo. Search all products by.