Nozzle Design; Nozzle Location - Siemens SITRANS LR250 Compact Operating Instructions

4.3.2

Nozzle design

Threaded PVDF antenna
Flanged encapsulated antenna (FEA)
①
②
③
④
● The end of the antenna must protrude a minimum of 10 mm (0.4") to avoid false echoes
being reflected from the nozzle
● Minimum recommended nozzle diameter for the threaded PVDF antenna is 50 mm (2").
● An antenna extension (100 mm/3.93") is available for the horn antenna only.
● When installing the SITRANS LR250 with hygienic process connection, it is good hygienic
practice to install the antenna in a nozzle that has a maximum length/diameter ratio of 1:1.
For example, 2" (DN50) diameter nozzle should be no longer than 2" (50 mm).
● When removing any sanitary/hygienic clamp version of the HEA to clean the lens, ensure
it is re-installed in the exact position it was removed from, to avoid re-commissioning the
device.
● The maximum nozzle length for the FEA is 500 mm (19.68").
Not applicable for FEA or HEA
1)
4.3.3

Nozzle location

● Avoid central locations on tall, narrow vessels
● Nozzle must be vertical and clear of imperfections
LR250 (mA/HART)
Compact Operating Instructions, 06/2018, A5E33469191-AB
Minimum clearance: 10 mm (0.4")
Minimum diameter: 50 mm (2")
Maximum nozzle length
Maximum length/diameter ratio 1:1
Stainless steel horn antenna
Hygienic encapsulated antenna (HEA)
.
1)
Installing/mounting
4.3 Proper mounting
19