Isa 5.1 Symbols

28 ANSI/ISA-S5.1-1984 (R 1992)

6.2 Instrument line symbols

ALL LINES TO BE FINE IN RELATION TO PROCESS PIPING LINES.

ANSI/ISA-S5.1-1984 (R 1992) 29

6.3 General instrument or function symbols

30 ANSI/ISA-S5.1-1984 (R 1992)

6.3 General instrument or function symbols (contd.)

* It is not mandatory to show a common housing.

** These diamonds are approximately half the size of the larger ones.

*** For specific logic symbols, see ANI/ISA Standard S5.2.

13 14

19 20

16 17

15

18

21

6TE2584-23

INSTRUMENT WITHLONG TAG NUMBER

INSTRUMENTS SHARINGCOMMON HOUSING *

PILOTLIGHT

C12

PANEL MOUNTEDPATCHBOARD POINT 12

P

IR

**

*****

PURGE ORFLUSHING DEVICE

**

REST FORLATCH-TYPE ACTUATOR

DIAPHRAGMSEAL

UNDEFINEDINTERLOCK LOGIC

ANSI/ISA-S5.1-1984 (R 1992) 31

6.4 Control valve body symbols, damper symbols

1 2 3 4

8

1211

76

109

5

GENERAL SYMBOL ANGLE BUTTERFLY ROTARY VALVE

GLOBETHREE-WAY

DIAPHRAGM

FOUR-WAY

DAMPER OR LOUVER

Further information may be added adjacent to the body symbol either by note or code number.

32 ANSI/ISA-S5.1-1984 (R 1992)

6.5 Actuator symbols

ANSI/ISA-S5.1-1984 (R 1992) 33

6.5 Actuator symbols (contd.)

34 ANSI/ISA-S5.1-1984 (R 1992)

6.6 Symbols for self-actuated regulators, valves, and other devices

ANSI/ISA-S5.1-1984 (R 1992) 35

6.6 Symbols for self-actuated regulators, valves, and other devices (contd.)

36 ANSI/ISA-S5.1-1984 (R 1992)

6.6 Symbols for self-actuated regulators, valves, and other devices (contd.)

ANSI/ISA-S5.1-1984 (R 1992) 37

6.7 Symbols for actuator action in event of actuat or power failure (shown typically for diaphragm-actuated control valve).

38 ANSI/ISA-S5.1-1984 (R 1992)

6.8 Primary element symbols

ANSI/ISA-S5.1-1984 (R 1992) 39

6.8 Primary element symbols (contd.)

40 ANSI/ISA-S5.1-1984 (R 1992)


ANSI/ISA-S5.1-1984 (R 1992) 41


42 ANSI/ISA-S5.1-1984 (R 1992)


ANSI/ISA-S5.1-1984 (R 1992) 43


44 ANSI/ISA-S5.1-1984 (R 1992)


ANSI/ISA-S5.1-1984 (R 1992) 45


46 ANSI/ISA-S5.1-1984 (R 1992)


ANSI/ISA-S5.1-1984 (R 1992) 47


48 ANSI/ISA-S5.1-1984 (R 1992)

6.9 Examples — functions

ANSI/ISA-S5.1-1984 (R 1992) 49

6.9 Examples — functions (contd.)

50 ANSI/ISA-S5.1-1984 (R 1992)


ANSI/ISA-S5.1-1984 (R 1992) 51


52 ANSI/ISA-S5.1-1984 (R 1992)


ANSI/ISA-S5.1-1984 (R 1992) 53


54 ANSI/ISA-S5.1-1984 (R 1992)


ANSI/ISA-S5.1-1984 (R 1992) 55


56 ANSI/ISA-S5.1-1984 (R 1992)

6.10 Examples — miscellaneous combinations

FT400

PR500FY

FR401

TT300

PR500

HC300

FI402

FT

UU300

FC

FT

FIK403

M

LI

LIT

TSL301

TSL301

PSH501

PSH501

FIC404

FIC404

LT

1

PREFERRED METHODTO BE USED IF INTERLOCK IS

UNDEFINED OR COMPLEX. I-1 MAY BESUBSTITUTED FOR I TO REFER TO

INTERLOCK DETAIL NO. 1, TO BEDRAWN ELSEWHERE. THE OUTPUTS OFTSL-301 AND PSH-501 MAY ENTER THE

INTERLOCK BOX SEPARATELYIN

OPTIONAL METHODMAY BE USED IF RELAY EXISTS AND

ONE DESIRES TO SHOW IT

COMPLEX COMBUSTION CONTROL SYSTEM,UU-300, ADJUSTING

SET-POINT OF FLOW CONTROL SYSTEM

4 5

FLOW TRANSMITTER WITHEXTERNAL TEMPERATURE

COMPENSATION

FLOW RECORDER WITH PRESSUREPEN CONNECTED TO TAP OFDIFFERENTIAL-PRESSURE-

TYPE FLOW RECORDER

MANUAL LOADING STATIONWITHOUT OUTPUT GAGE AND

WITH FLOW RECEIVERINDICATOR

2 3

(UPSTREAMALTERNATIVE)

(DOWNSTREAMALTERNATIVE)

TANK

TANK

LEVEL TRANSMITTERWITH INTEGRAL

INDICATION

LEVEL TRANSMITTERWITH SEPARATE

INDICATION

SP

FLOW CONTROLLOOP THAT MAYBE BLOCKED BYINTERLOCK AC-

TUATED BYEITHER LOW TEM-

PERATURE ORHIGH PRESSURE

6

7

I

I

M

MFY

ANSI/ISA-S5.1-1984 (R 1992) 57

6.10 Examples — miscellaneous combinations (contd.)

58 ANSI/ISA-S5.1-1984 (R 1992)


ANSI/ISA-S5.1-1984 (R 1992) 59


PR508

LSL602

LSL603

PSH511

HMS304

PR508

FRC407

FV407

PTPT508FT

FT

FRC407

27

ALTERNATIVE 1 ALTERNATIVE 2

28PR-507PEN 2

PR-508

PT-508

E EH H

FRC-407PEN 1

FV-407

FRC-407

29STOP

STANDBY ON-OFF

START STANDBY

LEAD-LAGLSHL605

LSHL604

LIMIT ON-OFF

TRIP

S S

S

PSHL510

PSH509

I-2

RESET

THE JUDICIOUS USE OF WORDS CAN CLARIFY DESIGN INTENT

INTERRELATED INSTRUMENTS WHOSE SYMBOLS ARE SCATTERED ON DIAGRAM. (A MULTI-POINT INSTRUMENT, SUCH AS A DATA LOGGER, THAT IS DESIGNATED WITH POINT

NUMBERS ON A DIAGRAM IS NOT EXPECTED TO HAVE THE SYMBOLS FOR THE VARIOUSPOINTS TIED OR REFERENCED TOGETHER). PEN ASSIGNMENTS NEED NOT BE SHOWN ON

A DIAGRAM IF IT IS THE USER'S PREFERENCE TO SHOW THEM IN AN INDEX.

60 ANSI/ISA-S5.1-1984 (R 1992)


ZSL303

ZSL303

ZSL302

ZSL302

FQT411

FQT411

ZSL801

ZSL801

YIC1

YC1

YC1

YIC1

YC1

AIC

FI

103

410

30 31

32

ALTERNATIVE 1 ALTERNATIVE 2

33

SP

1:1

INDIVIDUAL INSTRUMENTS WITH INTEGRALFUNCTION BLOCKS: SQUARE ROOT

EXTRACTION, 1:1 FEED BOOST, FEEDFORWARD BIAS ON CONTROLLER OUTPUT,

SETPOINT OUTPUT SIGNAL

PROGRAMMABLE CONTROLLER SCHEME. ALTERNATIVE 2 ALLOWS MORE DEFINITION OFWHICH SIGNALS ARE ACCESSIBLE TO THE OPERATOR

ANSI/ISA-S5.1-1984 (R 1992) 61

6.11 Example — complex combinations

62 ANSI/ISA-S5.1-1984 (R 1992)

6.12 Example — degree of detail

1 TYPICAL SYMBOLISM FOR SIMPLIFIED DIAGRAMS

LC

A

HOT OIL

FC

F

A

PC

LC

FC

VACUUM

* SEE SECTION 4.4 FOR DISCUSSION

Simplified symbolism and abbreviated identification used to define theprincipal points of measurement and control interest.

ANSI/ISA-S5.1-1984 (R 1992) 63

6.12 Example — degree of detail (contd.)

2 TYPICAL SYMBOLISM FOR CONCEPTUAL DIAGRAMS

LT

ATAC

FT

F

V/F

X

f(t)

f(t)

X

FC

FT

ACI-Y

F/DD

F

AT

PT PC

V

F

V~BTU=KQ T∆

TDT

X

LC

FT

FT

FC

LC

B

FC

LT

HOT OIL

Q

D

VACUUM

* SEE SECTION 4.4 FOR DISCUSSION

D

Functionally oriented symbolism and abbreviated identification used todevelop control concepts without concern for specific hardware.

64 ANSI/ISA-S5.1-1984 (R 1992)

6.12 Example — degree of detail (contd.)

ANSI/ISA-S5.1-1984 (R 1992) 65

Index

Term Para. No.- A -

Accessibledefinition ..............................3graphic symbols ...................6.3

Actuatoractuator action...................... 6.7graphic symbols ...................6.5identification ......................... 5.1

Air Supplyidentification ......................... 6.2

Alarmdefinition............................... 3examples ..............................6.9identification ......................... 5.1

Analysisexamples ..............................6.8identification ......................... 5.1

Assignabledefinition............................... 3

Auto-Manual Station(Control Station)definition............................... 3identification ......................... 5.1

Auxiliary Locationgraphic symbol ..................... 6.3

Averaginggraphic symbol ..................... 5.4

- B -Balloon, Bubble

definition............................... 3graphic symbol ..................... 6.3

Behind-the-Paneldefinition............................... 3graphic symbol ..................... 6.3

Biasgraphic symbol ..................... 5.4

Term Para. No.Binary

definition...............................3graphic symbol .....................6.2

Board (Panel)definition...............................3identification .........................6.3

Burner, Combustionexample................................6.8identification .........................5.1

- C -Complex Combinations

example................................6.11Computer Function

graphic symbol .....................6.3Computing Device

definition...............................3example................................6.9function.................................5.4identification .........................5.1

Conceptual Diagramsexample................................6.12

Conductivity (see Analysis)example................................6.8

Configurabledefinition...............................3

Controllerdefinition...............................3

Controlexample................................6.9identification .........................5.1

Control Station(Auto-Manual Station)

definition...............................3example................................6.9identification .........................5.1

Control Valvedefinition...............................3

Isa 5.1 Symbols

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