User's Manual
Table Of Contents
- 8 Parameter reference
- 9 Service and maintenance
- 10 Diagnosing and troubleshooting
- 11 Technical data
- 12 Dimension drawings
- 12.1 Threaded horn antenna
- 12.2 Threaded horn antenna with extension
- 12.3 Flanged horn antenna
- 12.4 Flanged horn antenna with extension
- 12.5 Flanged encapsulated antenna (2"/DN50/50A sizes only)
- 12.6 Flanged encapsulated antenna (3"/DN80/80A sizes and larger)
- 12.7 Threaded PVDF antenna
- 12.8 Threaded connection markings
- 12.9 Raised-Face flange per EN 1092-1 for flanged horn antenna
- 12.10 Raised-Face flange per EN 1092-1 for flanged encapsulated antenna
- 12.11 Flat-Face flange
- 12.12 Process connection tag (pressure rated versions)
- A Appendix A: Technical reference
- B Appendix B: PROFIBUS PA profile structure
- C Appendix C: Communications via PROFIBUS
- D Appendix D: Certificates and Support
- 13 List of abbreviations
- 14 LCD menu structure
- Glossary
- Index
Parameter reference
SITRANS LR250 (PROFIBUS PA)
Operating Instructions, 01/2014, A5E32221386-AB
109
Propogation Factor (2.5.3.)
Note
•
When operating in a stillpipe, values for
CLEF Range (2.5.7.4.)
, and for the propagation
factor, should be set according to the pipe size. See the table below.
•
For reliable results, the antenna size must be close to the pipe size.
Compensates for the change in microwave velocity due to propagation within a metal stillpipe
instead of in free space.
Values
Range:
0.3 to 1.0 depending on pipe size.
Default:
1.0000
Nominal Pipe Size
a)
40 mm (1.5")
50 mm (2")
80 mm (3")
100 mm (4")
Propagation Factor
0.9844
0.988
0.9935
0.9965
CLEF Range (2.5.7.4.)
Low calibration
point - 700 mm
(2.29 ft)
b)
Low calibration
point - 700 mm
(2.29 ft)
b)
Low calibration
point - 1000
mm (3.28 ft)
b)
Low calibration
point - 1000 mm
(3.28 ft)
b)
a)
Since pipe dimensions may vary slightly, the propagation factor may also vary.
b)
CLEF range covers the whole measurement range except first 700 or 1000 mm from unit
reference point (see A in graphic below)
①
sensor reference point
③
low calibration point
②
air gap
④
CLEF range 2.5.7.4.
A
700 or 1000 mm
Note
Flanged encapsulated antenna
For Flange
d encapsulated antenna (7ML5432) match the process connection size to the
pipe diameter whenever possible (for example, mount a DN80/3" flange on DN80/3" pipe).