Siemens LU01 Manuel D’Utilisation

Page 92

SITRANS LU01 – INSTRUCTION MANUAL

7ML19985BE02

When the dust settles (and the echo is regained) the reported level advances toward the 
actual level. When the reported level reaches 25.55 m (5% of Span less than the high high 
alarm trip point), the high high alarm goes off, restarting the infeed and filling the vessel 
to 27.00 m. 

To perform a volume conversion for the preceding example, we'll assume: 

•

the vessel is cylindrically shaped with a flat bottom. 

•

the vessel volume for Empty to 29.01 m (Span) is 1457 m3. 

Volume Parameter Settings 

Now in the RUN mode the Reading represents material volume in m

3

. 

This mode of operation is commonly used when remaining vessel capacity is of more 
importance to the installation than the actual material level. 

For this example we'll assume the following: 

•

the vessel is a 3 ft diameter by 15 ft long cylinder (including the parabolic ends of 1.5 
ft each). 

•

the maximum vessel filling rate is 1 ft per minute (slower at mid level). 

•

a mA output scaled from 4 mA at Full to 20 mA at Empty is required for PLC 
operation. 

•

in the event of a measurement difficulty, failsafe operation is to be activated in 6 
seconds. 

•

if the difficulty doesn't subside, the mA output must immediately assume 22.00 mA. 

•

an XCT-8 transducer is mounted in a standpipe so that the face is 18 in. above the 
vessel top. 

•

a TS-3 temperature sensor is mounted in the vessel to monitor liquid temperature. 

P050

Tank Shape

Enter "1" for 

vertical cylinder with flat bottom

. 

P051

Max Volume

Enter "1457" for 

1457 m

3

. 

1.5ft

(P052)

12.00 ft

(P053)

3.00ft

(P007)

3.00ft

(P007)