Siemens SITRANS LR250 Operating Instructions Manual page 75

①
②
A
Propagation Factor/Stillpipe Diameter
Values
Nominal Pipe Size
Propagation Factor
CLEF Range (2.5.7.4.) settings
Since pipe dimensions may vary slightly, the propagation factor may also vary.
a)
CLEF range covers the whole measurement range except first 700 or 1000 mm from sensor
b)
reference point
Note
Flanged and Hygienic encapsulated antenna
For Flanged encapsulated antenna (7ML5432) and Hygienic encapsulated antenna
(7ML5433) match the process connection size to the pipe diameter. For example, DN80/3"
flange to DN80/3" pipe.
SITRANS LR250 (PROFIBUS PA)
Operating Instructions, 08/2014, A5E32221386-AC
sensor reference point
air gap
700 or 1000 mm (see CLEF Range settings in table below)
a)
③
low calibration point
④
CLEF range 2.5.7.4.
Range 0.3 to 1.0 depending on pipe size
Default 1.0000
40 mm (1.5") 50 mm (2")
0.9844 0.988
Low Low
calibration calibration
point - 700 point - 700
mm (2.29 ft) mm (2.29 ft)
b)
Commissioning
6.3 Application examples
80 mm (3") 100 mm (4")
0.9935 0.9965
Low Low
calibration calibration
point - 1000 point - 1000
mm (3.28 ft) mm (3.28 ft)
b) b) b)
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