7ML19985JF02 SITRANS LR250 (PROFIBUS PA) – INSTRUCTION MANUAL Page 3
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SITRANS LR250
Abbreviations and Identifications
Short
form
Long Form Description Units
AIFB Analog Input Function Block
CE / FM /
CSA
Conformitè Europèene / Factory
Mutual / Canadian Standards
Association
safety approval
C
i
Internal capacitance F
DCS Distributed Control System control room apparatus
dK dielectric constant
EDD Electronic Device Description
I
i
Input current mA
I
o
Output current mA
IS Intrinsically Safe safety approval
L
i
Internal inductance mH
mH milliHenry 10
-3
Henry
µF microFarad 10
-6
Farad
µs microsecond 10
-6
Second
PA
Process Automation
(PROFIBUS)
PED Pressure Equipment Directive safety approval
pF pico Farads 10
-12
Farad
ppm parts per million
PV Primary Value
a)
a)
The output from the Level Transducer Block can be called the Primary Value (or
Secondary Value). When it becomes the input to the AIFB, it is called the
Process Variable.
measured value
SELV Safety extra low voltage
SV Secondary Value
a)
equivalent value
TB Transducer Block
TVT Time Varying Threshold sensitivity threshold
U
i
Input voltage V
U
o
Output voltage V
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