Electrical Relay Diagram and P&ID Symbols From Industrial

2 Electrical Relay Diagram Symbols www.industrialtext.com 1-800-752-8398 ELECTRICAL RELAY DIAGRAM SYMBOLS SWITCHES Disconnect Circuit Interrupter Limi...

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Electrical Relay Diagram and P&ID Symbols From Industrial Text and Video Co. The Leader in Electrical, Motor Control and PLCs Video Training Programs (www.industrialtext.com

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Electrical Relay Diagram Symbols

E LECTRICAL R ELAY D IAGRAM S YMBOLS

SWITCHES Circuit Interrupter

Disconnect

DISC

C1

PRS

LS

CB

Limit (cont.) Maintained Proximity Switch Position Closed Open LS

Liquid Level

PRS

FS

Flow (Air, Water)

Foot

FLS

FTS

Held Closed

Held Open

LS

LS

Normally Closed

FS

PS

PS

Toggle

Cable Operated (Emerg.) Switch

F

TGS

FTS

NP NP

Vacuum & Pressure

Normally Normally Normally Open Closed Open

Normally Normally Normally Normally Open Closed Open Closed FLS

Limit Normally Normally Neutral Position Open Closed LS LS Actuated LS

Circuit Breaker

Temperature Normally Normally Open Closed TS

Plugging PLS

TS

Nonplug

F PLS

F PLS

COS

PB R

2-Position

3-Position

SS F

1

PLS

2

1

SS 2

R

Rotary Selector Nonbridging Bridging Contacts Contacts

Selector

Plugging w/Lockout Coil

RSS

3

RSS

OR

OR

RSS

RSS

1 LO

Thermocouple Switch TCS OFF



+

1



+

2



+

Single Circuit Normally Open

Push Buttons Double Circuit Mushroom PB Head

PB

PB

Total Contacts To Suit Needs Connections, Etc. Maintained Conductors Contact Not Connected Connected PB

Normally Closed PB

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Electrical Relay Diagram Symbols

Contacts Connections, Etc. (cont.) Chassis Plug Time Delay After Coil Relay, Etc. Thermal Ground Or Frame and Normally Normally Normally Normally Normally Normally OverNot Necessarily Recp. Open Load Closed Open Closed Open Closed Grounded GRD

CH

PL

TR

TR

TR

TR

CR

M

CR

CON

M

OL

CON

IDL

RECP

Coils Solenoids, Brakes, Etc. Thermal Relays, Timers, 2-Position 3-Position 2-Position Overload General Etc. Hydraulic Pneumatic Lubrication Element CR TR M CON

SOL

SOL

SOL 2-H

SOL

3-P

Control Circuit Transformer H1

OL IOL

2-L

H3

H2

T X2

X1

Coils (cont.) Reactors (cont.) Adjustable Iron Core

Motors Magnetic Amplifier Winding

Air Core

H4

MAX

3-Phase Motor MTR

DC Motor Armature MTR

X A

X

Pilot Lights

Horns, Siren, Etc.

Buzzer

Bell

AH

ABU

ABE

Push to Test PL

PL

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P&ID Symbols

P&ID S YMBOLS INSTRUMENT LINE SYMBOLS Capillary tube Electric signal EM, sonic, radioactive Hydraulic Pneumatic Process

SYMBOLS FOR TRANSDUCERS AND ELEMENTS FE 10

FE 104

Orifice plate

Venturi or nozzle

FI 5

EE 4

Magnetic

Rotameter

FV 101

Control valve

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P&ID Symbols

INSTRUMENT IDENTIFICATION LETTERING

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

First Letter

Second Letter

Analysis Burner, combustion User’s choice User’s choice Voltage Flow rate User's choice Hand (manually initiated) Current (electric) Power Time or time schedule Level User’s choice User’s choice User’s choice Pressure, vacuum Quantity Radiation Speed or frequency Temperature Multivariable Vibration, mechanical analysis Weight, force Unclassified** Event, state, or presence Position, dimension

Alarm User’s choice* Control Sensory (primary element) Glass (sight tube) Indicate Control station Light (pilot) User’s choice Orifice, restriction Point (test connection) Record or print Switch Transmit Multifunction Valve, damper, louver Well Unclassified Relay, compute Driver, actuator, unclassified

* User’s choice may be used to denote a particular meaning, having one meaning as a first letter and another meaning as a second letter. The user must describe the particular meaning(s) in the legend. This letter can be used repetitively in a particular project. ** Unclassified letters may be used only once or to a limited extent. If used, the letter may have one meaning as a first letter and another meaning as a second letter. The user must specify the meaning(s) in the legend. Reference: ANSI/ISA-S5.1-1984, Instrumentation Symbols and Identification, ISBN 0-87664-844-8

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