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ANSI/ISA-S5.1

Instrumentation Symbols andIdentifcation

ISA: Instrument Society of AmericaANSI: American National Standards Institute

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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.

Purpose: To Establis a uni!orm means o! desi"natin" instruments

and instrumentation systems used !or measurement and control.

Application toindustriesApplication towork activities

Application toclasses of inst.and to inst.Function.Extent offunctional

identicationExtent of loopidentication

E#P$ANATI%N

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FunctionalIdentication Table&ultiple 'ubble: one

inscribed TI(-) and oneinscribed TS*-). Teinstrument +ould be

desi"nated TI(/TS*-) !orall uses in +ritin" orre!erence. I! desired,o+eer,te abbreiationTI(-) may sere !or"eneral identifcation or

!or purcasin", +ile TS*-)may beused !or electric circuitdia"rams.

All $etters (apital. p*

letters +itin one "roupsould not eceed !our

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Loop Identication:

irst-letter and a number.Eac instrument +itin a loop as assi"ned to it te same loop number.Eac instrument loop as a uni0ue loop identifcation. An instrumentcommon to t+o ormore loops sould carry te identifcation o! te loop +ic is consideredpredominant.$oop numberin" may be parallel or serial: TI(-1, 2(-1, $I(-1, AI-1/ TI(-1, 2(-11, $I(-13, Al-1)

SY!"LS:

#A$TI"%A&Y %"TES

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TA'$E N%&EN($AT42E

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ENE2A$ INST24&ENT 4N(TI%N S6&'%$

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7EINITI%NS

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7EINITI%NS

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7EINITI%NS

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7EINITI%NS

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7EINITI%NS

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Net classes ocus

Symbol +it control loop

7iscussion on Symbol 8 Table

(ontrol $o"ic 7iscussion Eample o! Some Standard P8I7.

Preparation o! P8I7

P8I7 P7 (ec9 $ist Assi"nment