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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This standard now forms Part 1 of two Parts of BS on electromagnetic flowmeters as follows: Means should be provided for adjusting and aligning the adjacent pipework. While these effects are normally compensated for in the secondary device, limits of error for each influencing quantity should be specified by the manufacturer.
Durchflussmessung von leitfaehigen Fluessigkeiten in geschlossenen Leitungen. Except as permitted under the Copyright, Designs and Patents Act no extract may be reproduced, stored in a retrieval system or transmitted in any form or by any means — electronic, photocopying, recording or otherwise — without prior written permission from BSI.
In this case, the inlet and outlet straight pipe sections shall be the same size as the flowmeter see 7. Care should be taken to ensure that signal cables are not routed in proximity to high current cables. The coils producing the magnetic field may be energized from the normal single-phase supply, or from some other supply. One or more pairs of electrodes, diametrically-opposed, are set into the wall such that the diameter on which they lie, the magnetic field and the flow direction are mutually orthogonal.
BS EN ISO 6817:1997
This effect has been minimized by the designs of the pole pieces. It is essential that account is taken of any other chemicals liable to pass through the meter tube, such as sterilizing agents, cleaners and solvents. It covers their installation, operation, performance and calibration. Part 2BSBS Your Alert Profile lists the documents that will be monitored. Heating of the electrodes can also be used to remove fat or grease deposits from sewage.
These cables should be as short as possible and not 687 the limit imposed by the manufacturer. Worldwide Standards We can source any standard from anywhere in the world. General guidance on various aspects of the primary device is set out in 7.
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As the user knows the properties of the liquid to be metered, the ultimate decision on the materials to be used should rest with him. It is identical with ISO The choice of liner material depends mainly on the liquid, which can range from slurries or molasses to chemically-aggressive mixtures or molten metals. Reference should also be made to ISO for fuller information on this subject.
Instructions in relation to electrical grounding of the flowmeter system shall be rigidly observed. One of the most recent developments is to position the electrodes outside a dielectric liner, the system operating by capacitive coupling, with no contacts within the metering tube. Deposition of electrically conducting layers on the inside surface of the liner may also lead to errors. He realized that since the velocity profile of a flowing liquid was rarely flat, the emf existing across the pipe diameter deriving from the central velocity would be effectively shunted by those from the slower moving flows near the pipe wall.
Standard BS EN ISO
The situation has improved since the days of the voltameter thermionic valve and germanium transistor. This standard has been updated see copyright date and may have had amendments incorporated. Information on the allowable tolerances for matching the pipe and meter ixo bores is given in ISO The pulsed direct current d. The power supply should be taken from a point that is as free as possible from transient voltages. Other specific designs are also available, 8617 example, 6187 cast steel case with the coils insulated inside the case and liners fitted internally to this again.
It presents the UK view on standards in Europe and at the international level. NOTE 2 Additional information such as trademark, mass of unit, date of manufacture, flow direction arrow, etc.
Its application is generally limited only by the requirement that the metered liquid shall be electrically conductive and non-magnetic. Meters based on this principle are Equation 4 may be interpreted in various ways to capable of measuring flow in either direction through the meter tube.
Flanges are usually provided to connect the primary device to the plant pipework, although flangeless meters are available in smaller sizes. Every effort should be made to minimize piping loads and resulting strains at the primary device connecting flanges, particularly in plastic meters which are not intended to sustain piping loads.
Users of British Standards are responsible for their correct application.