1. PROCESS MODELLING

 

• Instrumentation Symbols,

 

Table 2: ANSI/ISA-S5.1-1984 Instrumentation Symbols and Identification

LETTER

FIRST LETTER

SECOND LETTER

A

Analysis

Alarm

B

Burner, Combustion

User’s Choice

C

User’s Choice

Control

D

User’s Choice

 

E

Voltage

Sensor (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, Dimen sion

Driver, Actuator, Unclassified

 

• Line symbols include,

 

 

• Sensor and actuator symbols include,

 

 

• An example of a process diagram is given below,

 

 

 

1.1 REFERENCES

1.2 PRACTICE PROBLEMS

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