Instrumentation Symbols and Identification NOTICE OF COPYRIGHT This is a copyrighted document and may not be copied or distributed in any form or manner without the permission of ISA. This copy of the document was made for the sole use of the person to whom ISA provided it and is subject to the restrictions stated in ISA’s license to that person. It may not be provided to any other person in print, electronic, or any other form. Violations of ISA’s copyright will be prosecuted to the fullest extent of the law and may result in substantial civil and criminal penalties. . | AMERICAN NATIONAL STANDARD ANSI R1992 Formerly ANSI R1992 Instrumentation Symbols and Identification NOTICE OF COPYRIGHT This is a copyrighted document and may not be copied or distributed in any form or manner without the permission of ISA. This copy of the document was made for the sole use of the person to whom ISA provided it and is subject to the restrictions stated in ISA s license to that person. It may not be provided to any other person in print electronic or any other form. Violations of ISA s copyright will be prosecuted to the fullest extent of the law and may result in substantial civil and criminal penalties. Reaffirmed 13 July 1992 ISA-The Instrumentation Systems and Automation Society ANSI R1992 Instrumentation Symbols and Identification ISBN 0-87664-844-8 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 . Box 12277 Research Triangle Park North Carolina 27709 Preface This preface is included for information and is not a part of ANSI R1992 . This standard has been prepared as 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 . Box 12277 Research Triangle Park NC 27709 Telephone 919 5498411 e-mail standards@. 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 SI in
