Siemens 7ML5431 - Page 68

Commissioning
6.3 Application examples
SITRANS LR250 with mA/HART
68 Operating Instructions, 10/2019, A5E32220602-AG
Propagation Factor/Stillpipe Diameter
①
sensor reference point
③
low calibration point
②
air gap
④
CLEF range 2.8.4.4.
A
700 or 1000 mm (see CLEF Range settings in table below)
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 (2.8.4.4.) settings
Low calibra-
tion point -
700 mm
(2.29 ft)
b)
Low calibra-
tion 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 sensor refer-
ence 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.