S-20A Specification Forms

TABLE OF CONTENTS 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

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ISA-S20 — Specification Forms for Process Measurement and Control Instruments, Primary Elements and Control Valves ISBN 0-87664-347-0 Copyright ©  Copyright © 1981 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, or otherwise), 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 been prepared 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. review. Toward this end the Society welcomes all comments and criticisms, and asks that they be addressed to the Standards and a nd 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 S ubcommittee on Instrument Specification Forms (RP20.1) and was originally published in 1956 under un der 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 Fluor Corporation. This revision was prepared, with the supervision of the Chairman, R. E. Frey of Rohm and Haas Company, 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 and Porter 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 o f the draft and by offering suggestions suggestions toward its improvement, improvement, is gratefully acknowledged. 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 Nationa l Load North American Rockwell

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L. R. Brewer A. M. Calabrese F. I. Callisen Callise n 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 Kinder sley 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

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Koppers Company, Company, Inc. M. W. Kellogg Company C. F. Braun & Company United Technology echnolo gy Center Goddard Space Flight Center The Fluor Corporation Hunt-Wesson Foods Dow Chemical Company Dow Chemical Company Honeywell, Honeywel l, Inc. Proctor & Gamble Honeywell, Inc. The Fluor Corporation Union Carbide Corporation Philco-Ford Philco -Ford Valter, Inc. Allied Chemical Corporation Tennessee enness ee Eastman Company Allied Chemical Corporation E. I. duPont deNemours & Company Beckman Instruments Kamyr Inc. Instrumentation Consultant NASA Stone & Webster Engineering Corporation Stearns-Roger Corporation Dow Chemical Company Crawford & Russell, Inc. Sargent & Lundy Drexelbrook Engineering Company Philco-Ford Bechtel Corporation Corpora tion Dow Badische Company Monsanto Company Brown & Root, Inc. The Detroit Edison Company Lockheed Missile & Space Company Federal Aviation Administration Brown & Root, Inc. Johnson Service Company E. I. duPont deNemours & Company IBM Corporation Honeywell, Inc. General Electric

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E. J. Rogers D. E. Sanchez R. H. Schipper K. D. Smith E. F. Spalidoro Spalid oro W. Speight J. L. Thoma D. J. Untener W. C. Voyles J. Walsh, Jr. N. S. Waner J. P. Wolfinger N. R. Zeller R. Zielski

Bourns Life Systems Jensen Instrument Company Jordan Valve General Electric Company Barton Sales Honeywell Controls, Ltd. Wyandotte Chemicals Corporation Standard Oil Company Cummins Engine Company Compan y, Inc. Eastman Kodak Company Hallikainen Instruments Alpha Portland Cement Company Tucson Gas & Electric Company Georgia-Pacific Corporation

This Standard was approved for publication by the Standards and Practices Board on July 15, 1975. NAME

COMPANY

W. B. Miller, Vice President R. G. Hand, Secretary P. Bliss L. N. Combs B. A. Christensen R. L. Galley T. J. Harrison Harriso n T. S. Imsland P. S. Lederer E. C. Magison J. R. Mahoney R. L. Martin R. G. Marvin A. P. McCauley McCaule y T. A. Murphy R. L. Nickens G. Platt A. T. Upfold K. A. Whitman

Moore Products Company ISA Pratt Whitney Aircraft Company retired from E. I. duPont deNemours & Company Continental Oil Company Bechtel Corporation IBM Corporation Corpor ation Fisher Controls Control s Company Compan y National Bureau of Standards Honeywell, Inc. IBM Corporation Tex-A-Mation Engineering, Inc. Dow Chemical Company Glidden Glidde n Durkee Div. SCM Corporation Corpora tion The Fluor Corporation, Corpora tion, Ltd. Reynold Metals Company Bechtel Corporation Polysar Ltd. Allied Chemical Corporation

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 Contents

Section Title

Draft Revision in Committee

Section Number

Purpose ......................... ...................................... .......................... .......................... ......................... ......................... .......................... .......................... ......................... ..............1 ..1 Scope ........................ ..................................... ......................... ......................... .......................... .......................... ......................... ......................... .......................... ....................2 .......2 Receiver instruments ......................... ...................................... .......................... .......................... ......................... ......................... .......................... ..................3 .....3 Annunciators ......................... ..................................... ......................... .......................... .......................... ......................... ......................... .......................... ....................4 .......4 Potentiometer instruments specification sheet instructions ....................... .................................... ....................5 .......5 Temperature instruments (filled systems) systems) .......................... ....................................... ......................... ......................... ......................6 .........6 Thermocouples and thermowells ........................ ..................................... .......................... .......................... .......................... .........................7 ............7 Resistance temperature sensors ........................ ..................................... .......................... .......................... .......................... .........................8 ............8 Bi-metal thermometers ......................... ...................................... .......................... ......................... ......................... .......................... .......................... ................9 ...9 Differential pressure instruments ......................... ...................................... .......................... .......................... ......................... .....................10 .........10 Orifice plates and flanges ......................... ...................................... .......................... .......................... .......................... ......................... .....................11 .........11 Rotameters .......................... ....................................... ......................... ......................... .......................... .......................... ......................... ......................... ....................12 .......12 Magnetic flowmeters ........................ ..................................... .......................... .......................... ......................... ......................... .......................... ..................13 .....13 Turbine flowmeters flo wmeters .......................... ...................................... ......................... .......................... .......................... ......................... ......................... ....................14 .......14 Positive displacement meters .......................... ....................................... ......................... ......................... .......................... .......................... ..............15 .15 Level instruments (displacer or float) ......................... ...................................... ......................... ......................... .......................... ................16 ...16 Level instruments, capacitance type ........................ ..................................... ......................... ......................... .......................... ..................17 .....17 Gage glasses and cocks .......................... ...................................... ......................... .......................... .......................... .......................... .......................18 ..........18 Traps and drainers ......................... ..................................... ......................... .......................... .......................... .......................... ......................... .....................19 .........19 Pressure instruments ......................... ...................................... .......................... .......................... ......................... ......................... .......................... ................20 ...20 Pressure gages ........................ ..................................... .......................... .......................... ......................... ......................... .......................... .......................... ..............21 .21 Pressure switches ......................... ..................................... ......................... .......................... .......................... .......................... ......................... .....................22 .........22 Instructions for control valve data sheet — ISA Form S20.50, Rev. 1 ...........................23 Pressure control valves — pilots & regulators ........................ ..................................... .......................... .......................... ..............24 .24 Self-actuated temperature regulators ......................... ...................................... ......................... ......................... .......................... ................25 ...25 Pressure relief valves ......................... ...................................... .......................... .......................... ......................... ......................... .......................... ................26 ...26 Rupture discs ......................... ...................................... .......................... .......................... .......................... ......................... ......................... .......................... ................27 ...27 Solenoid valves ........................ ..................................... .......................... .......................... ......................... ......................... .......................... .......................... ..............28 .28

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1 Purpose 1.1 The purpose of this standard is to promote uniformity in instrument specifications, both in content and form. Because of the complexity of present day day instruments and controls it is desirable to have some type of specification form form to list pertinent details for use by all interested parties. General use of these forms by users and manufacturers offers many advantages, as listed below: 1)

Assist Assists s in preparat preparation ion of compl complete ete speci specific ficati ation on by listin listing g and provid providing ing space space for for all principal descriptive options.

2)

Prom Promot otes es unif unifor orm m term termin inol olog ogy* y*..

3)

Facilitates Facilitates quoting, quoting, purchasing, purchasing, receiving, receiving, accounting accounting and ordering ordering procedures procedures by uniform uniform display of information.

4)

Provid Provides es a usefu usefull perman permanent ent record record and and means means for for checki checking ng the the instal installat lation. ion.

5)

Improv Imp roves es effic efficienc iency y from from the init initial ial conc concept ept to to the final final instal installat lation ion..

2 Scope 2.1 These forms are intended to assist the specification writer to present the the basic information. In this sense they are "short-form" specifications or "check sheets" and may not include all necessary engineering data or definitions of application requirements. requirements. While the types of instruments instruments described by these forms are more common to the process industries the forms should also prove useful in other areas if special requirements are defined elsewhere. 2.2 Some forms consist of a primary sheet and a secondary (tabulation) sheet. The primary sheet may be used by itself to specify a single instrument or to specify general requirements for a series of similar instruments which are then tabulated on the secondary sheet. 2.3 The heading used on all forms is designed to permit the user to add company name, plant location, trade mark, or specific project data. 2.4 The specification forms included in this standard are intended to cover the most commonly used instruments. The list is not a complete catalog of instruments instruments and control valves available. available. It is intended that new forms shall be added with each general revision of this standard. 2.5 An instruction sheet is provided for each form to explain the terms used and the intended procedure. The instructions are keyed to the form by reference to to the line numbers. The Committee has minimized dependence on the instruction sheet since the forms are frequently reprinted and used without the instructions. The explanation is omitted where the meaning is felt felt to be obvious. 2.6 Instrument specifications may be prepared by the use of Automatic Data Processing (ADP) techniques. The format of such specifications may be modified in order to be compatible with ADP machine capabilities. However, However, general consistency with this Standard shall be retained. retained. *Where applicable, the terminology used is in accordance with American National Standards C85.1-1963, "Terminology "Terminology for Automatic Control," sponsored by the American Society of Mechanical Engineers. E ngineers.

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3 Receiver instruments

3.1 Instructions for ISA Forms S20.1a and 20.1b 20.1b.. 1)

To be used used for for a sing single le item item.. Use seconda secondary ry sheet sheet for for mult multipl iple e listi listing. ng.

2)

Check eck a as s ma many as as ap apply.

3)

Nomina Nom inall size size refers refers to to app approx roxima imate te fron frontt of case case dime dimensi nsions ons;; width width x heig height. ht.

4)

It is assume assumed d that that the the instrum instrument ent has has its its o own wn case case or shelf shelf suitable suitable ffor or single single mounting, mounting, unless "MULTICASE" "MULTICASE" is checked. Shelf or separable case for multiple case case mounting instrument is not included unless listed and described as an accessory. accessory.

5)

Enclosure Enclosure class refers refers to composite composite instrument. instrument. If electr electrical ical contacts contacts are the the c case ase they must meet this classification classification inherently or by reason of the enclosure. Use NEMA identification system or ISA system RP8.1.

6)

Specif Specify y electr electrica icall power power to to the enti entire re instr instrume ument nt from from an an extern external al sourc source. e.

7)

For multiple multiple instru instruments ments list ranges on second secondary ary sheet, sheet, but but specif specify y other other chart chart options options on primary sheet. Chart graduations assumed to be uniform unless otherwise otherwise noted. Circular charts assumed to have 24 hr/revolution speed; strip charts 3/4 in. to 1 in. per hour.

8)

Chart drive Chart drive mech mechani anism sm assum assumed ed to be be synchr synchrono onous us motor motor opera operatin ting g on 117V 117V 60 60 Hz and and suitable for ENCLOSURE CLASS specified on line 5. If the chart drive is pneumatic so state — identify pneumatic pulser under options. options. Note deviations from standard (MFR) under notes, i.e., dual speed or special speeds.

9)

The scale type may be SEGMENT SEGMENTAL, AL, VERTICAL VERTICAL,, HORIZO HORIZONT NTAL, AL, DIAL (CIRCULAR (CIRCULAR)) or other. Ranges 1, 2, 3 and 4 are used for multiple inputs. The first listed (No. 1) is assumed assumed to be the controller input, if a controller is used.

10)

See explanati explanation on of terminology terminology given given on specificat specification ion sheet. sheet. For further further defini definition tion refer refer to American National Standard C85.1-1963, "Terminology "Terminology for Automatic Control." Specific ranges of control modes can be listed after "OTHER," if required.

11)

For multip multiple le items items spec specify ify on on second second shee sheet. t.

12)

If standard standard auto-ma auto-manual nual switch switching ing is not not known known or not adequat adequate, e, specify specify partic particular ular requirements, such as BUMPLESS, PROCEDURELESS, 4-POSITION, or as required.

13)

Remote Remote set point point adjustment adjustment assum assumes es full adjustm adjustment ent range. range. Specify Specify limits limits if required. required. Under other can be noted bias or ratio.

14) 14)

Spec Sp ecif ify y if app appli lica cabl ble. e.

15) 15)

Spec Sp ecif ify y if app appli lica cabl ble. e.

16)

All input input signals signals on multimulti-channel channel instruments instruments assumed assumed to be the same same range unless otherwise noted.

17) 17)

Spec Sp ecif ify yn num umber ber of inpu inputs ts..

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18)

Check if power power source source for the the loop is contai contained ned in this this instrume instrument nt or in some some external external instrument.

19)

Form may may be SPST, SPST, SPDT, SPDT, DPDT or or other. other. Rating Rating refers refers to electrica electricall rating of switch switch or contacts in amps.

20)

Specify Specify if alarm is actuated actuated by measure measured d variable variable or by deviation deviation from from controlle controllerr set point. point. Give contact action if single throw form.

21)

Specify Specify required required acces accessories sories and options, options, fill in in numb number er of charts charts.. This is assured assured to be number of chart rolls for strip charts.

22)

After select selection ion is made made fill fill in manufact manufacturer urer and and specific specific model model number number..

SECONDARY SHEET — for listing multiple instruments. instruments. List all instruments of the same type specified on the primary sheet, with variations as shown. "Notes refers to notes listed by number at the bottom of the sheet. Line 11 of sheet sheet 1a is tabulated under measurement increases, output tabulate increase or decrease.”

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ISA Form S20.2b

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4 Annunciators

Instructions for ISA Forms S20.2a S20.2a and  and 20.2b  20.2b 1)

Write Write in Tag Numb Number er of ent entire ire Annunc Annunciat iator or system system..

2)

Omit if single unit.

3)

Spec Sp ecif ify y cabi cabine nett mo moun untting. ing.

4)

Spec Sp ecif ify y typ type of cabin abinet et..

5)

Refe Re fers rs only only to disp displa lay ya and nd audi audibl ble. e.

6)

Spec Sp ecif ify y powe powerr supp supply ly requ requir ired ed..

7)

Check Check WHITE WHITE TRANSLUCE TRANSLUCENT NT,, or or write write in color of plate and engraving engraving required. required. Specify Specify window size in height x width.

8)

Number Num ber of iinde ndepen penden dentt displ displays ays in o one ne box, box, or posi positio tion n in cabinet cabinet..

9)

If individual individual bullseyes, bullseyes, specify specify number and color required. required. If self-cont self-contained ained unit, specify specify number of normal and off-normal lights and color of each. (Example — two red independent off-normal and one green common normal light.)

10)

Describe Describe displa display y if other than blacklighte blacklighted d nameplat nameplate e or bullseye. bullseye. For example; example; Blacklighted prism, Electrolumenescent, Two-color pneumatically operated.

11)

Specify Specify type type of logic unit which which operate operates s display display and audible audible system. system.

12) Che Check ck requ require ired d locati location on of logic logic compo component nents. s. 13)

Check Enclosure Enclosure Class Class of logic logic componen components ts and or or enclosure. enclosure. General General purpose purpose relays relays inside an explosion proof housing, or explosion proof p roof relays will both satisfy the hazardous area classification. Use NEMA identification system system or ISA system system RP8.1.

14)

Specify Specify voltage voltage across across contacts contacts which actuate actuate alarm.

15) 15)

Give Give cont contac actt act actio ion. n.

16) Sequen Sequentia tiall Alarm Alarm refers refers to to "First "First Out" Out" syst system. em. 17) Specify Specify type type of ring ring back back,, if app applic licabl able. e. 18) An operat operation ional al test test act actuat uates es audibl audible e as well as as lamps. lamps. 19) Specify Specify flas flasher her loca locatio tion n and mode modell number number.. 20)

Specify Specify ttype ype of Acknowl Acknowledgme edgment, nt, and Pushbutton Pushbutton locations. locations.

21) Specify Specify reset reset and and push pushbut button ton locati location. on. 22)

Write Write in ISA Sequenc Sequence e number number as described described in RP18.1, RP18.1, Specific Specifications ations and Guides Guides For the Use of General Purpose Annunciators, or fill in the table for the sequence required.

23)

Write Write in the model number, number, or describe describe type, type, if required required..

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24)

Write Write in the model number, number, or describe describe type, type, if required required..

25)

Write Write in the model number, number, or describe describe type, type, if required required..

26) Specif Specify y numb number er requ require ired, d, and and color color.. 27)

Specify Specify power power supply supply location, location, i.e., i.e., in in logic cabinet, cabinet, or separat separate e cabinet. cabinet.

28) For any addi additio tional nal acce accesso ssorie ries s requi required red.. 29) 29)

Fill Fill in in afte afterr sele select ctio ion n is mad made. e.

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