Siemens SITRANS LR 460 Manual de usuario Pagina 10

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Page 4 SITRANS LR 460 – INSTRUCTION MANUAL 7ML19985JM01
mmmmm
SITRANS LR 460
FV Full Vacuum
ESD Electrostatic Discharge
HART PV HART Primary Variable Output value from AIFB1
HART SV HART Secondary Variable Output value from AIFB2
I
i
Input current mA
I
o
Output current mA
IS Intrinsically Safe safety approval
L
i
Internal inductance mH
LR Level Radar
LTB Level Transducer Block
mH milliHenry 10
-3
Henry
µF microFarad 10
-6
Farad
µs microsecond 10
-6
Second
PA
Process Automation
(PROFIBUS)
PDM
Process Device Manager
(SIMATIC)
pF pico Farads 10
-12
Farad
ppm parts per million
psia pounds/square inch absolute
PV Primary Value
1
default measured value
RH relative humidity
SCFM standard cubic feet/minute
SV1 Secondary Value1
1
LTB level output (level units)
SV2 Secondary Value2
1
LTB distance output (sensor
units)
TV Transmitter Variable
TVT Time Varying Threshold sensitivity threshold
U
i
Input voltage V
U
o
Output voltage V
1.
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. It is distinct from the HART PV.
Short
form
Long Form Description
Units
(cont’d)
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