Instrument Naming
On a Piping and Instrumentation Diagram, instruments are designated by an alphanumeric code or tag.
Instrument NamingThese letters go together to form unique Instrumentation Identification. The typical Instrumentation Matrix is a good starting place for typical instrumentation found in a plant. | |||
---|---|---|---|
Letter | First Letter | Second Letter | Third Letter |
A | Analyzer | Alarm | - |
B | Burner or Combustor | - | - |
C | Available | - | - |
D | Available | - | - |
E | Voltage | Element | - |
F | Flow Rate | - | - |
G | Available | Glass | - |
H | Hand | - | High |
I | Current (Electrical) | Indicator | - |
J | Power | - | - |
K | Time, Schedule | - | - |
L | Level | Light | Low |
M | Available | - | Middle |
N | Available | - | - |
O | Available | Orifice | - |
P | Pressure | Connection Point (Test) | - |
Q | Quantity | - | - |
R | Radiation | Record | - |
S | Speed | Switch | - |
T | Temperature | Transmitter | - |
U | Multivariable | Multi-function | - |
V | Vibration | Valve | - |
W | Weight | Well | - |
X | Unclassified | Unclassified | - |
Y | Event | - | - |
Z | Position | Actuator, Driver | - |