Siemens SITRANS LR250 Instruction Manual page 17

Keep the emission cone free of interference:
• Make allowance for the emission cone spreading (see table showing
on page 21).
• Locate the antenna away from the side wall, to avoid interference from indirect
echoes.
• Avoid interference from objects such as ladders or pipes, which can cause false
echoes.
• Make sure the emission cone does not intersect the fill path:
Notes:
• beam width (defined at –3dB
boundary) depends on horn size:
see table showing
on page 21
• For more detail on false echoes,
Appendix F: Technical
see
Reference
on page 102.
7ML19985JE01
beam width
GRAPHIC TO BE UPDATED
SITRANS LR250 (HART) – INSTRUCTION MANUAL
allowance for beam width
beam
width
beam width
Page 13