Siemens SITRANS LR250 Instruction Manual page 7

Short
Long Form
form
C Internal capacitance
i
D/A Digital to analog
DAC Digital Analog Converter
DCS Distributed Control System
FV Full Vacuum
ESD Electrostatic Discharge
Highway Addressable
HART
Remote Transducer
I Input current
i
I Output current
o
IS Intrinsically Safe
L Internal inductance
i
LRV Lower Range Value
LSL Lower Sensor Limit
mH milliHenry
µF microFarad
µs microsecond
Pressure Equipment
PED
Directive
pF pico Farads
ppm parts per million
PV Primary Variable
SV Secondary Variable
TVT Time Varying Threshold
U Input voltage
i
U Output voltage
o
URV Upper Range Value
USL Upper Sensor Limit
1.
100% is most commonly set to 20 mA, and 0% to 4 mA: however, the settings
can be reversed.
7ML19985JE01 SITRANS LR250 (HART) – INSTRUCTION MANUAL
Description
control room apparatus
safety approval
value for process empty level 4 mA
below which no PV is
anticipated
-3
10
-6
10
-6
10
safety approval
-12
10
measured value
equivalent value
sensitivity threshold
value for process full level
above which no PV is
anticipated
Units
mA
mA
mH
1
Henry
Farad
Second
Farad
V
V
1
20 mA
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