LEGEND
TO CONCEPT FLOW SHEETS
SPEC - 102 C
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DATE
Page 2 of 2
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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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