Norma isa s20 para hojas de datos de instrumentos

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ISA-S20-1981
Approved October 30, 1981
DO NOT PHOTOCOPY - SEE PRINTING RESTRICTIONS IN "ABOUT THIS LIBRARY"

Standard

Specification Forms
for Process Measurement
and Control Instruments,
Primary Elements and
Control Valves

The International Society for Measurement and Control

DO NOT PHOTOCOPY - SEE PRINTING RESTRICTIONS IN "ABOUT THIS LIBRARY"

ISA-S20 — SpecificationForms for Process Measurement and Control Instruments, Primary
Elements and Control Valves
ISBN 0-87664-347-0
Copyright © 1981 by 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, orotherwise), without the prior written permission of the
publisher.
ISA
The International Society for Measurement and Control
67 Alexander Drive
P.O. Box 12277
Research Triangle Park, North Carolina 27709

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Preface

(This Preface is included for information purposes and is not part of S20).
This Standard has beenprepared as a part of the service of the ISA toward a goal of uniformity in the
field of instrumentation. To be of real value this report should not be static, but should be subjected
to periodic review. Toward this end the Society welcomes all comments and criticisms, and asks that
they be addressed to the Standards and Practices Board Secretary, ISA, 67 Alexander Drive,
P.O. Box 12277,Research Triangle Park, North Carolina 27709, Telephone (919) 549-8411,
Fax (919) 549-8288.
This document was prepared by the Subcommittee on Instrument Specification Forms (RP20.1) and
was originally published in 1956 under the direction of G. G. Gallagher of the Fluor Corporation. In
1961 additional forms were published, prepared by Committee 8D-RP20 under the direction of W.
Carmack of the FluorCorporation. This revision was prepared, with the supervision of the Chairman,
R. E. Frey of Rohm and Haas Company, by the committee as listed below.
SP20 COMMITTEE
NAME

COMPANY

R. E. Frey (deceased)
W. S. Buzzard
J. G. Converse
G. F. Erk
J. Imber
R. D. Irwin
E. F. Kremer
R. Leese
R. D. Prescott
A. Rosenthol
F. J. Ryan, Jr.
W. C. Thomas

Rohm and Haas Company
Fisher andPorter Company
Sun Oil Company
Sun Oil Company
Atlantic Richfield Company
Honeywell, Inc.
E. I. duPont deNemours & Co., Inc.
Catalytic Inc.
Moore Products Company
Catalytic Incorporated
Clifford B. Ives & Co., Inc.
Clifford B. Ives & Co., Inc.

The assistance of those who aided in the preparation of this Standard, by their review of the draft and
by offering suggestions toward itsimprovement, is gratefully acknowledged. The following have
reviewed the report and served as Board of Review:
NAME

COMPANY

C. B. Anderson
W. A. Bajek
A. S. Bartholomew
C. S. Beard
J. V. Becker
O. K. Booth

Armstrong Cork Company
UOP Process Division
Reliance Electric Company
Bechtel Corporation
National Load
North American Rockwell

921

ISA-S20

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L. R. Brewer
A. M. Calabrese
F. I. Callisen
C. P. Clark
G. T. Clawson
R. Coel
L. Costea
W. G. Cozart
E. Csaky
J. W. Eby
M. W. Fifer
W. Forsyth
G. G. Gallagher
W. J. Greter
H. P. Haas
L. A. Haines
M. G. Haines
W. Y. Harkins
E. J. Hayter
J. E. Holland
E. A. Houser
P. Kindersley
L. Kipnis
C. D. Kolbe
W. B. Kostiw
E. R. Langston
P. E.Larsen
B. G. Liptak
R. Loewe
F. Maltby
C. A. Master
A. F. Marks
M. W. Marxen
C. McCrain
R. T. Miller
H. E. Nurmi
P. L. Pettersen
E. Podolak
C. Pray
H. D. Preszler
C. A. Prior
G. R. Rauschenberg
J. Rellford
W. A. Richards

ISA-S20

Koppers Company, Inc.
M. W. Kellogg Company
C. F. Braun & Company
United Technology Center
Goddard Space Flight Center
The Fluor Corporation...