Nozzle Location - Siemens SITRANS L Series Compact Operating Instructions

Installing/mounting
4.3 Proper mounting
● 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)
4.3.3

Nozzle location

● Avoid central locations on tall, narrow vessels
● Nozzle must be vertical and clear of imperfections
Beam angle
Note
• Beam width depends on antenna size and is approximate: see table below.
● Beam angle is the width of the cone where the energy density is half of the peak energy
density.
● The peak energy density is directly in front of and in line with the antenna.
● There is a signal transmitted outside the beam angle, therefore false targets may be
detected.
22
.
1)
Compact Operating Instructions, 11/2019, A5E48453206-AA
Preferred
Undesirable
SITRANS LR250 with PROFIBUS PA