LEGEND
TO CONCEPT FLOW SHEETS
SPEC - 102 C
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SIG.
6.
LETTER CODE FOR IDENTIFICATION OF INSTRUMENT FUNCTIONS
FIRST LETTER
SUCCEEDING LETTER (1)
MEASURED OR INITIATING VARIABLE
MODIFIER
DISPLAY OR OUTPUT FUNCTION
A
ALARM
B
DISPLAY OF STATE
(2)
C
CONTROLLING (4)
D
DENSITY
DIFFERENCE
E
ALL ELECTRICAL VARIABLES
(5)
SENSING ELEMENT
F
FLOW RATE
RATIO
G
GAUGING, POSITION OR LENGTH
H
HAND (MANUALLY INITIATED) OPERATED
I
INDICATING
(3)
J
SCAN
K
TIME OR PROGRAMMED TIME
L
LEVEL
M
MOISTURE OR HUMIDITY
N
USER'S CHOICE
USER'S CHOICE
O
USER'S CHOICE
P
PRESSURE OR VACUUM
TEST-POINT CONNECTION
Q
QUALITY
(5)
INTEGRATE OR TOTALIZE
INTEGRATING OR SUMMATING
R
NUCLEAR RADIATION
RECORDING
S
SPEED OR FREQUENCY
SWITCHING
(2)
T
TEMPERATURE
TRANSMITTING
U
MULTIVARIABLE
MULTIFUNCTION UNIT
V
VISCOSITY
VALVE, DAMPER, ACTU, ELEMENT
W
WEIGHT OR FORCE
X
UNSPECIFIED
(5)
UNCLASSIFIED FUNCTIONS
Y
VIBRATION
COMPUTING RELAY, RELAY
Z
EMERG. / SAFETY ACTING
(2)
EXAMPLE : PDIRC
DIFFERENTIAL PRESSURE INDICATION, RECORDING AND CONTROL
FIRST LETTER P, MODIFIER D, SUCCEEDING LETTERS I,R,C
1) NORMAL SEQUENCE OF SUCCEEDING LETTERS : B.I.R.C.T.Q.S.Z.A.
2) SIGNAL TYPE : ON/OFF
3) SIGNAL TYPE : CONTINUOUS
4) SIGNAL TYPE : NORMALLY CONTINUOUS. IF ON-OFF, S IS ADDED
5) A NOTE SPECIFIES THE MEASURED PROPERTY. E.g. FOR LETTER E, I, U, P OR F
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