Electrical Relay Diagrams and PID Symbol.pdf.PDF

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Electrical Diagram & PI&D
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 1-800-752-8398)
 
Electrical Relay
Diagram Symbols
E LECTRICAL R ELAY D IAGRAM S YMBOLS
SWITCHES
Disconnect
Circuit
Interrupter
Circuit
Breaker
Normally
Open
Normally
Closed
Limit
Neutral Position
LS
LS
LS
Actuated
DISC
C1
CB
LS
Held
Closed
Held
Open
NP
NP
LS
LS
Limit (cont.)
Liquid Level
Vacuum & Pressure
Normally
Open
Temperature
Maintained
Position Closed
Proximity Switch
Normally
Open
Normally
Closed
Normally
Closed
Normally
Open
Normally
Closed
Open
LS
PRS
PRS
FS
FS
PS
PS
TS
TS
Flow (Air, Water)
Normally
Open
Foot
Toggle
Cable
Operated
(Emerg.)
Switch
Plugging
Nonplug
Normally
Closed
Normally
Open
Normally
Closed
F
F
F
PLS
PLS
PLS
TGS
FLS
FLS
FTS
FTS
COS
PPB
R
R
Plugging
w/Lockout
Coil
Selector
Rotary Selector
Bridging
Contacts
2-Position
3-Position
Nonbridging
Contacts
SS
SS
RSS
RSS
1
2
3
F
1
2
PLS
OR
OR
RSS
RSS
1
LO
Total Contacts To Suit Needs
Thermocouple
Switch
Push Buttons
Connections, Etc.
Single
Circuit
Normally
Open
Double Circuit
Mushroom
Head
Maintained
Contact
Conductors
Not
Connected
Connected
TCS
PB
–
+
PB
PB
PB
OFF
1
–
+
Normally
Closed
2
–
+
PB
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Electrical Relay
Diagram Symbols
Connections, Etc. (cont.)
Contacts
Time Delay After Coil
Normally
Open
Ground
Chassis
Or Frame
Not Necessarily
Grounded
Plug
and
Recp.
Normally
Closed
Normally
Open
Normally
Closed
Relay, Etc.
Normally
Open
Normally
Closed
Thermal
Over-
Load
GRD
CH
PL
TR
TR
TR
TR
CR M
C O N
CR M
C O N
OL
I D L
RECP
Coils
Relays,
Timers,
Etc.
Solenoids, Brakes, Etc.
Thermal
Overload
Element
Control
Circuit
Transformer
General
2-Position
Hydraulic
3-Position
Pneumatic
2-Position
Lubrication
CR
M
TR
CON
SOL
SOL
SOL
3-P
SOL
OL
IOL
H1
H3
H2
H4
2-H
2-L
T
X1
X2
Coils (cont.)
Reactors (cont.)
Motors
3-Phase
Motor
DC Motor
Armature
Adjustable
Iron Core
Air Core
Magnetic Amplifier
Winding
MAX
MTR
MTR
X
X
A
Pilot Lights
Horns, Siren, Etc.
Buzzer
Bell
Push to Test
AH
ABU
ABE
PL
PL
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P&ID
Symbols
P&ID S YMBOLS
I NSTRUMENT L INE S YMBOLS
Capillary tube
Electric signal
EM, sonic, radioactive
Hydraulic
Pneumatic
Process
S YMBOLS FOR T RANSDUCERS AND E LEMENTS
FE
10
FE
104
Orifice plate
Venturi or nozzle
EE
4
FI
5
Magnetic
Rotameter
FV
101
Control valve
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P&ID
Symbols
I NSTRUMENT I DENTIFICATION L ETTERING
First Letter
Second Letter
A
Analysis
Alarm
B
Burner, combustion
User’s choice*
C
User’s choice
Control
D
User’s choice
E
Voltage
Sensory (primary element)
F
Flow rate
G
User's choice
Glass (sight tube)
H
Hand (manually initiated)
I
Current (electric)
Indicate
J
Power
K
Time or time schedule
Control station
L
Level
Light (pilot)
M
User’s choice
N
User’s choice
User’s choice
O
User’s choice
Orifice, restriction
P
Pressure, vacuum
Point (test connection)
Q
Quantity
R
Radiation
Record or print
S
Speed or frequency
Switch
T
Temperature
Transmit
U
Multivariable
Multifunction
V
Vibration, mechanical analysis
Valve, damper, louver
W
Weight, force
Well
X
Unclassified**
Unclassified
Y
Event, state, or presence
Relay, compute
Z
Position, dimension
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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