Electrical Relay Diagram and PID Symbols

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Electrical Relay Diagram

and

P&ID Symbols

2

Electrical RelayDiagram Symbols

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ELECTRICAL RELAY DIAGRAM SYMBOLS

SWITCHES

DisconnectCircuit

Interrupter

Limit

Neutral PositionCircuit

Breaker NormallyOpen

NormallyClosed

HeldClosed

HeldOpen

Actuated

MaintainedPosition Closed Open

Proximity SwitchLimit (cont.)

NormallyOpen

NormallyClosed

Liquid Level Vacuum & Pressure

NormallyOpen

NormallyClosed

NormallyOpen

NormallyClosed

Temperature

Flow (Air, Water)

NormallyOpen

NormallyClosed

NormallyOpen

NormallyClosed

Foot Toggle CableOperated(Emerg.)Switch

Plugging Nonplug

Pluggingw/Lockout

Coil 2-Position

Selector

3-Position NonbridgingContacts

Rotary SelectorBridgingContacts

OR OR

Total Contacts To Suit Needs

ThermocoupleSwitch

Push ButtonsSingleCircuit

NormallyOpen

NormallyClosed

Double CircuitMushroom

Head

Connections, Etc.Maintained

ContactConductors

NotConnected

Connected

DISC C1CB

LS LS

LS LS

LS

NPNP

LS

LS PRS PRS FS FS PS PS TS TS

FLS FLS FTS FTS TGSCOS

PLSF

PLS

R

F FPLS

R

FPLS

1LO

SS

1 2

SS1 2 3

RSS RSS

RSSRSS

TCS

– +OFF

1

2

–

–

+

+

PB

PB PB

PBPB

PB

PB

3

Electrical RelayDiagram Symbols


Connections, Etc. (cont.)

GroundChassis

Or FrameNot Necessarily

Grounded

Plugand

Recp.

ContactsTime Delay After Coil

NormallyOpen

NormallyClosed

NormallyOpen

NormallyClosed

Relay, Etc.

NormallyOpen

NormallyClosed

ThermalOver-Load

GRD CH

RECP

PL TR TR TR TR CR M

CON

CR M

CON

OL

IDL

CoilsRelays,Timers,

Etc.

Solenoids, Brakes, Etc.

General 2-PositionHydraulic

3-PositionPneumatic

CRM

TRCON

SOL SOL

2-PositionLubrication

ThermalOverloadElement

ControlCircuit

Transformer

2-H

SOL

3-P 2-L

SOL OLIOL

H1 H3 H2 H4

X1 X2

Coils (cont.)

Reactors (cont.)AdjustableIron Core

Air Core Magnetic AmplifierWinding

Motors

3-PhaseMotor

DC MotorArmature

XX

MAX MTR MTR

A

Pilot Lights Horns, Siren, Etc. Buzzer Bell

PL PL

Push to TestAH ABU ABE

T

4

P&IDSymbols


P&ID SYMBOLS

INSTRUMENT LINE SYMBOLS

SYMBOLS FOR TRANSDUCERS AND ELEMENTS

Orifice plate

Control valve

RotameterMagnetic

Venturi or nozzle

FE10

FE104

EE4

FI5

Capillary tube

Electric signal

EM, sonic, radioactive

Hydraulic

Pneumatic

Process

FV101

5

P&IDSymbols


INSTRUMENT IDENT IF ICAT ION LETTER ING

First Letter Second Letter

A Analysis AlarmB Burner, combustion User’s choice*C User’s choice ControlD User’s choiceE Voltage Sensory (primary element)F Flow rateG User's choice Glass (sight tube)H Hand (manually initiated)I Current (electric) IndicateJ PowerK Time or time schedule Control stationL Level Light (pilot)M User’s choiceN User’s choice User’s choiceO User’s choice Orifice, restrictionP Pressure, vacuum Point (test connection)Q QuantityR Radiation Record or printS Speed or frequency SwitchT Temperature TransmitU Multivariable MultifunctionV Vibration, mechanical analysis Valve, damper, louverW Weight, force WellX Unclassified** UnclassifiedY Event, state, or presence Relay, computeZ Position, dimension Driver, actuator, unclassified

* User’s choice may be used to denote a particular meaning, having onemeaning as a first letter and another meaning as a second letter. The usermust describe the particular meaning(s) in the legend. This letter can be usedrepetitively in a particular project.

** Unclassified letters may be used only once or to a limited extent. If used, theletter may have one meaning as a first letter and another meaning as a secondletter. 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

Electrical Relay Diagram and PID Symbols

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