ISA RP74.01-1984Application and Installation of Weighbridge Scales.pdf

RECOMMENDED PRACTCE
ISA-RP74.01-1984
N W
Application and Installation
of Continuous-belt
Weighbridge Scales
Approved 30 March 1984
ISA-THE Instrumentation
Systems, and
Automation Society
ISA-RP74.01-1984, Application and Installation of Continuous-belt Weighbridge Scales
ISBN0-87664-814-6
Copyright @1984 by the Instrument Society of America. All rights reserved. Printed in the United
States of America. No part of this publication may be reproduced, stored in a retrieval system, or
transmitted in any form or by any means(electronic, mechanical, photocopying, recording, or
otherwise), without the prior written permission of the publisher
ISA
67 Alexander Drive
P.O. Box 12277
Research Triangle Park, North Carolina 27709
Preface
This preface is included for information purposes and is not a part of ISA-RP7401-1984
This recommended practice has been prepared as a part of the service of ISA toward a goal of
uniformity in the field of instrumentation. To be of real value, this document should not be static
but should be subject to periodic review. Toward this end, the Society welcomes all comments
and criticisms, and asks that they be addressed to the Secretary, Standards and Practices Board
ISA, 67 Alexander Drive, P.O. Box 12277, Research Triangle Park, NC 27709, Telephone
(919)549-8411, e-mail: standards@isa. org
The ISA Standards and Practices Department is aware of the growing need for attention to the
metric system of units in general, and the International System of Units()in particular, in the
preparation of instrumentation standards. The Department is further aware of the benefits to
U.S.A. users of ISA standards of incorporating suitable references to the Sl(and the metric
system)in their business and professional dealings with other countries. Toward this end, this
Department will endeavor to introduce Sl-acceptable metric units in all new and revised
standards to the greatest extent possible. The Metric Practice Guide, which has been published
by the Institute of Electrical and Electronic Engineers as ANSI/IEEE Std. 268-1982, and future
revisions will be the reference guide for definitions, symbols, abbreviations, and conversion
factors
It is the policy of SA to encourage and welcome the participation of all concerned individuals and
terests in the development of ISA standards. Participation in the ISA standards-making
process by an individual in no way constitutes endorsement by the employer of that individual, of
I SA, or of any of the standards that ISA develops
The information contained in the preface, footnotes, and appendices is included for information
only and is not a part of the recommended practice
Prior to issuance of this recommended practice, NBS Handbook 44( Specification Tolerances
and Other Technical Requirements for Commercial Weighing and Measuring Devices)and OIML
IR50(Laws of the Member States Journal of European Communities Relating to Continuous
Totalizing Weighing Machines)were available to guide specifiers and buyers of weighbridge-type
continuous-belt weigh scales. These two documents are intended for use on the regulation of
weighing and apply to sales approved by weights and measures personnel
The purpose of this recommended practice is to furnish design cri