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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Equipotential conductive links usually copper braids should be fitted across both flange joints see Figure gs. 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, 681 or otherwise — without prior written permission from BSI.
Your basket is empty. 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. If the field is perpendicular to an electrically-insulated pipe which contains the hs liquid and if the electrical conductivity of the liquid uso not too low, a voltage may be measured between two electrodes on the wall of the pipe. Extra care should be taken during pipework construction to prevent excessive strain on the primary device, both during and after installation.
Ensure use of the most current version of this document by searching British Standards Online at bsonline. Covers their installation, operation, performance and calibration.
Need more than one copy? Flow pattern effects are described in 7. 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.
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Measurement of conductive liquid flow in closed conduits. You can download and open this file to your own computer but DRM prevents opening this file on another computer, including a networked server.
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Means should be provided for adjusting and aligning the adjacent pipework.
BS EN ISO – PDF Free Download
The combination 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.
Care be be taken to ensure that signal cables are not routed in proximity to high current cables. Flange bolts should be tightened evenly and in moderation in order to avoid damage to the lining. 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.
It provides outputs which can be in volts, milliamps or pulses per wn. The choice of liner material depends mainly on the liquid, which can range from slurries or molasses to chemically-aggressive mixtures or molten metals.
If necessary, warning devices should be installed to preserve measurement integrity. The coil assembly is either mounted externally or encapsulated within the pipe. 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 function of velocity.
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. Details and advice can be obtained from the Copyright Manager.
The meter samples the signal at zero magnetic field and zero adjusts, but does not differentiate against all other spurious signals. This method is becoming less commonly used in modern electromagnetic flowmeters.
As the voice of the U. Inside diameters, cross-sections, tolerances and designation codes. It covers their installation, operation, performance and calibration. It may collapse when subjected to sub-atmospheric pressures. Minimum operational conductivity requirements should be obtained from the manufacturers.
Figure 4 — Principle of pulsed d. In the latter case, the pipe may be made of magnetic material.
This standard has been updated see copyright date and may have had amendments incorporated. Medical Physics3: The scraper is driven by an external electric motor via fluid pressure seals.
BS EN ISO 6817
The pulsed direct bd d. BSPart 1, London. Find Similar Items This product falls into the following categories. It has good wear resistance properties. While these effects are normally compensated for in the secondary device, limits of error for each influencing quantity should be specified by the manufacturer. The internal impedance of the primary device obviously depends bw the liquid conductivity, and very large changes in this impedance may produce errors in the output signal.