Siemens Sitrans LR250 Operating Instructions Manual page 81

2.5.3. Propagation Factor
Notes:
• 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
Nominal Pipe Size
Propagation Factor
CLEF Range (2.5.7.4.)
a)
Since pipe dimensions may vary slightly, the propagation factor may also vary.
2.5.4. Minimum Sensor Value
The minimum recorded Sensor value in units defined in Unit (2.3.1.).
• Open the menu View – Device Diagnostics, select Device Status, and click
on the Device Status tab.
• Check Sensor Peak Values.
2.5.5. Maximum Sensor Value
The maximum recorded Sensor value in units defined in Unit (2.3.1.).
• Open the menu View – Device Diagnostics, select Device Status, and click
on the Device Status tab.
• Check Sensor Peak Values.
2.5.6. Shots
The number of echo profile samples averaged to produce a measurement.
Values
7ML19985JF04 SITRANS LR250 (PROFIBUS PA) – OPERATING INSTRUCTIONS
Range: 0.3 to 1.5 depending on pipe size.
Default: 1.000
a) 40 mm (1.5") 50 mm (2")
0.9844 0.9900
700 mm 700 mm
Range: 1 to 25
Default: 25
80 mm (3") 100 mm (4")
0.9961 0.9975
1000 mm 1000 mm
Page 75