Nozzle Design - Siemens SITRANS LR250 Compact Operating Instructions

4.3.2

Nozzle design

Threaded PVDF antenna
Polymeric lens versions
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 polymeric lens versions is 500 mm (19.68").
Not applicable for polymeric lens versions or HEA
1)
SITRANS LR250 with FOUNDATION FIELDBUS
Compact Operating Instructions, 09/2021, A5E48453221-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
21