BS EN ISO 6817 PDF

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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Medical Physics3: We share information about your activities on the site with our partners and Google partners: At the time of publication, the editions indicated were valid. If these details are to be used for any other purpose than implementation then the prior written permission of BSI must be obtained. It should be possible to remove the quadrature signal but complications arise when, for example, liquid conductivity is not uniform or earthing difficulties exist.

High Road If permission is granted, the terms may include royalty payments or a licensing agreement. This will be indicated in the amendment table on the inside front cover.

ELECTROMAGNETIC FLOWMETERS

These normative references are cited at the appropriate places in the text and the publications are listed hereafter. 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.

BSI also holds the copyright, in the UK, of the publications of the internationalstandardization bodies. 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.

ELECTROMAGNETIC FLOWMETERS

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.

Durchflussmessung von leitfaehigen Fluessigkeiten in geschlossenen Leitungen. If the document is revised or amended, you will be notified by email. This standard has been updated see copyright date and may have had amendments incorporated. The same applies if the offset is in the negative direction.

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Worldwide Standards We can source any standard from anywhere in the world. When measuring the flow rate of an electrolytea further problem is that because of the relatively low ion mobility, conductivity is likely to be affected by the flow, making it a e of velocity.

It may be used continuously or intermittently. Copyright Copyright subsists in all BSI publications. Installation dimensions of flanged type electromagnetic flowmeters. Usually, a reference signal from the isk device—which is proportional to the magnetic flux—is compared in the secondary device with the flow signal. The situation has improved since the days of the voltameter thermionic valve and germanium transistor. One or more pairs of electrodes, eh, are set into the wall such that the diameter on which they lie, the magnetic field and the flow direction are mutually orthogonal.

In ideal conditions, such meters should be capable of measuring flow rate with an uncertainty of 0. NOTE 2 Additional information such as trademark, mass of unit, date of manufacture, flow direction arrow, etc.

This method is becoming less commonly used in modern electromagnetic flowmeters. Contact the Information Centre. This approach is generally used on crystalline-type coatings. 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 be avoided. The manufacturer should state the maximum permissible torque. This usage also aligns with that in ISO However, it is useful to recall some general principles and to present the way in which they apply to measurement using an electromagnetic flowmeter.

Subscribing members of BSI are kept up to date with standards developments and receive substantial discounts on the purchase price of standards. It covers their installation, operation, performance and calibration. Ensure use of the most current version of this document by searching British Standards Online at bsonline. Follow these links to find other Standards similar to the one you are viewing.

Eccentric taper pipes shall be used when the pipeline is horizontal, to prevent air pockets from forming. 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.

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Deposition of electrically conducting layers on the inside surface of the liner may also lead to errors. You can download and open this file to your own computer but DRM prevents opening this file on another computer, including a networked server.

Information on the allowable tolerances for matching the pipe and meter tube bores is given in ISO In the case where cathodic protection is used to protect buried pipework, this precaution becomes essential see 7.

It is isp to cover every economic sector and virtually every activity of the humankind where technical standards may be used. Other specific designs are also available, ne example, a cast steel case with the coils insulated inside the case and liners fitted internally to this again. Buying standards Orders for all BSI, international and foreign standards publications should be addressed to Customer Services.

In the latter case, the pipe may be made of magnetic material.

66817 is essential that the primary device is correctly aligned on the pipe oso when it is bolted into the pipework. Methods of evaluating the performance of electromagnetic flow-meters for liquids. Such electrodes, bz, are more prone to fouling, introducing additional errors. Verfahren mit magnetisch-induktiven Durchflussmessgeraeten. 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.

Revisions British Standards are updated by amendment or revision. Many of these are extracted from ISO for ease of reference. Instructions in relation to electrical grounding of the flowmeter system shall be rigidly observed. Find Similar Items This product falls into the following categories.

Royal Danish Academy of Science and Letters.