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Automating Manufacturing Systems - Process Control and ...

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plc software - 32.6<br />

Table 1: ANSI/ISA-S5.1-1984 Instrumentation Symbols <strong>and</strong> Identification<br />

LETTER FIRST LETTER SECOND LETTER<br />

C User’s Choice <strong>Control</strong><br />

D<br />

User’s Choice<br />

E Voltage Sensor (Primary Element)<br />

F<br />

Flow Rate<br />

G User’s Choice Glass (Sight Tube)<br />

H<br />

H<strong>and</strong> (Manually Initiated)<br />

I Current (Electric) Indicate<br />

J<br />

Power<br />

K Time or Time Schedule <strong>Control</strong> Station<br />

L Level Light (pilot)<br />

M<br />

User’s Choice<br />

N User’s Choice User’s Choice<br />

O User’s Choice Orifice, Restriction<br />

P Pressure, Vacuum Point (Test Connection)<br />

Q<br />

Quantity<br />

R Radiation Record or Print<br />

S Speed or Frequency Switch<br />

T Temperature Transmit<br />

U Multivariable Multifunction<br />

V Vibration, Mechanical Analysis Valve, Damper, Louver<br />

W Weight, Force Well<br />

X Unclassified Unclassified<br />

Y Event, State or Presence Relay, Compute<br />

Z Position, Dimension Driver, Actuator, Unclassified<br />

The line symbols also describe the type of flow. Figure 32.3 shows a few of the<br />

popular flow lines.

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