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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These cables should be as short as possible and not exceed wn limit imposed by the manufacturer. This method is becoming less commonly used in modern electromagnetic flowmeters.
General guidance on various aspects of the primary device is set out in 7. 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.
Remember me Forgot password? This International Standard ido flowmeter types in both a.
ELECTROMAGNETIC FLOWMETERS
You may experience issues viewing this site in Internet Explorer 9, 10 or It is designed to cover every economic sector and virtually every activity of the humankind where technical standards may be used. Some of the earliest applications were concerned with measuring the flow rate of bloodKolin Care should be taken to ensure that signal cables are not routed in proximity to high current cables.
If the conductivity is not uniform throughout the meter, errors may also occur. This error comprises both systematic and random components depending upon the conditions of the flowmeter calibration, and can vary for each test point of the calibration curve. General introduction and classification. Your consent to our cookies if you continue to use this website. Subscription pricing is determined by: As the voice of the U. Standards Subsctiption may be the perfect solution. Methods of evaluating the performance of electromagnetic flow-meters for liquids.
BS EN ISO 6817:1997
Details and advice can be obtained from the Copyright Manager. Flow pattern effects are described in 7. The meter samples the signal at zero magnetic field and zero adjusts, but does not differentiate against all bbs spurious signals. Means should be provided for adjusting and aligning the adjacent pipework. If necessary, warning devices should be installed to preserve measurement integrity. To prevent the formation isi gas bubbles on the electrodes, these should normally be installed horizontally.
Standard BS EN ISO
The system produces an output signal proportional to volume flow-rate or average velocity. The electromagnetic flowmeter consists of a primary device and one or more secondary devices. The shaft length and the frequency of ultrasound are chosen to produce an antinode at the electrode face. Subscribing members of BSI are kept up to date with standards developments and receive substantial discounts on the purchase price of standards.
The same applies if the offset is in the negative direction. Ensure use of the most current version of this document by searching British Standards Online at bsonline. In the case where cathodic protection is used to protect buried pipework, this precaution becomes essential see 7.
BS EN ISO 6817
Lifting by any means that could damage the liner, for example, hooks in the bore, shall not be used. The use of direct current as a means of exciting the magnet has been quickly discarded because of the difficulty of electrochemical and polarization emfs appearing at the electrodes, and for many years excitation by alternating current was the norm.
617 you need help with the purchase or have any queries please email enquiries standards. However, it was not until the s that industrial applications became a reality.
The impedance of the liquid path should ideally be at least two orders of magnitude less than that of the input of the secondary device. Durchflussmessung von leitfaehigen Fluessigkeiten in geschlossenen Leitungen. We recommend that you check the website of the publishers of the international document before making a purchase.
Installation dimensions of flanged type electromagnetic flowmeters.
isi Search all products by. 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.
When designing the piping system, access for installing and removing the primary device as well as access to the electrical connections should be provided.
You may find similar items within these categories by selecting from the choices below:. 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. Covers their installation, operation, performance and calibration. The coil assembly is either mounted externally or 6187 within the pipe. Instructions in relation to electrical grounding of the flowmeter system shall be rigidly observed.
It is identical with ISO 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 bore should be used. This usage also aligns with that in ISO It is incorporated by Royal Charter. Part 1BS If these details are to be used for any other purpose than implementation then the prior written permission ba BSI isl be obtained. The power supply should be 8617 from a point that is as free as possible from transient voltages.
Systematic errors cannot be reduced by repeating measurements, since they arise from the characteristics of the measuring apparatus, the installation and the flow characteristics.