Siemens LR 460 Manual De Usuario

Page 4

SITRANS LR 460 – INSTRUCTION MANUAL 

7ML19985JM01

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.