Nozzle Design - Siemens SITRANS L Operating Instructions Manual

4.2.1.1

Nozzle design

• For nozzles 100 mm (4") in length or shorter use the 100 mm (4") shield.
• For nozzles 250 mm (10") in length or shorter use the 250 mm (10") shield.
The end of the shield section or end of the horn should protrude a minimum of 10 mm (0.4")
to avoid false echoes being reflected from the nozzle.
①
②
③
Location on a manhole cover
• A manhole cover is typically a covered nozzle with a diameter 610 mm (24") or greater.
• For optimum signal conditions, locate the antenna off-center, typically 100 mm (4") from
the side.
Avoid central locations on vessels
For vessels with conical or parabolic tops, avoid mounting the device at the center. The
concavity of the top can focus echoes into the center, giving false readings.
SITRANS LR200 with PROFIBUS PA
Operating Instructions, 07/2021, A5E32337680-AF
Locking ring secured by three 2 mm Allen set-screws
Threaded connection
Shield
Installing/mounting
4.2 Mounting
25