Installing/mounting
4.3 Proper mounting
SITRANS LR250 with FOUNDATION FIELDBUS
Compact Operating Instructions, 09/2021, A5E48453221-AB
21
4.3.2 Nozzle design
Stainless steel horn antenna
Hygienic encapsulated antenna (HEA)
Minimum clearance: 10 mm (0.4")
Minimum diameter: 50 mm (2")
Maximum length/diameter ratio 1:1
• The end of the antenna must protrude a minimum of 10 mm (0.4") to avoid false echoes
being reflected from the nozzle
1)
.
• 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").
1)
Not applicable for polymeric lens versions or HEA
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