Siemens LU01 Manuel D’Utilisation

7ML19985BE02

SITRANS LU01 – INSTRUCTION MANUAL

Page 99

Display blank, Transmit 
Neon not flashing, trans-
ducer not pulsing

No power

Check Power supply, wiring, and volt-
age switch.

No response to pro-
grammer.

Obstructed infrared inter-
face, or defective program-
mer

Clean enclosure “docking bay” and 
programmer magnet slot.

Displays “Short” and 
“tb:(#)”.

Short circuited transducer 
cable or defective trans-
ducer.

Repair or replace as necessary.

Displays “Open” and 
“tb:(#)”.

Transducer not connected

Connect transducer, or remove Point # 
from service (P001=0).

Open circuited transducer 
cable, or defective trans-
ducer.

Repair or replace as necessary

Displays “Error” and 
“tb:(#)”.

Transducer connected 
wrong

Reverse BLK and WHT wires

Wrong transducer (P004)

Enter correct value

Displays “LOE”.

Weak or non-existent echo.

Relocate and/or re-aim transducer at 
material level or object.
Proceed to Measurement Difficulties.

Displays “EEEE”.

Reading too high.

Select larger Units (P005), or lower 
Convert Reading (P061).

Reading fluctuates while 
material level is still, (or 
vice versa).

Incorrect measurement sta-
bilization.

Alter measurement Response (P003) 
accordingly.
See Technical Reference / Measure-
ment Response.

Reading is fixed, regard-
less of the actual mate-
rial level.

Transducer beam 
obstructed, standpipe too 
narrow, or transducer 
mounting resonant.

Relocate and/or re-aim transducer at 
material level or object
Proceed to Measurement Difficulties.

Material level reported 
is always “off” by the 
same amount.

Incorrect Empty (zero) refer-
ence.

See Empty (P006), Reading Offset 
(P063), Offset Calibration (P650), and 
Offset Correction (P652).

Measurement accuracy 
improves as level nears 
transducer.

Incorrect Sound Velocity 
used for distance calcula-
tion.

use an ultrasonic/temperature trans-
ducer or a TS-3 temperature sensor.
See Technical Reference Sound Veloc-
ity.

Reading is erratic, with 
little or no relation to 
material level.

True echo too weak or 
wrong echo being pro-
cessed.

Relocate and/or re-aim transducer at 
material level or object
Proceed to Measurement Difficulties.