Siemens Sitrans LR250 Instruction Manual page 55

2.2.1.12. Far Range
Allows the material level to drop below Low Calibration Point without
generating a Loss of Echo (LOE) state. Unit is defined in Sensor units. See
2.2.1.6. Low Calibration Pt. for an illustration.
Options
Use this feature if the measured surface can drop below the Low Cal. Point
in normal operation.
2.2.1.13. Propagation Factor
Notes:
• When operating in a stillpipe, values for
• For reliable results the horn size must be close to the pipe size.
Compensates for the change in microwave velocity from propagation in
free space.The value is used to compensate for changes in microwave
velocity due to propagation within a metal stillpipe, instead of in free space.
Values
Nominal Pipe
Size
Propagation
Factor
2.2.4.4.3. CLEF
Range
a.
2.2.1.19. Sensor Offset
A constant offset that can be added to Sensor value to compensate if the
sensor has been changed. Units are defined in Sensor Units.
Values
7ML19985JE01
Range: Min. = Low Calibration Pt.
Max. = 23 m (75.45 ft)
Default: Value for Low Calibration Pt. + 1 m (3.28 ft)
the propagation factor, should be set according to the pipe size. See
the table below.
Range: 0.6 to 1.0 depending on pipe size.
Default: 1.000
40 mm (1.5")
a
0.9828
Low Cal Pt.
– 700 mm
settings
Since pipe dimensions may vary slightly, the propagation factor may
also vary.
Default: 0 m
SITRANS LR250 (HART) – INSTRUCTION MANUAL
2.2.4.4.3. CLEF Range
50 mm (2") 80 mm (3")
0.990 0.991
Low Cal Pt. Low Cal Pt.
– 700 mm – 1000 mm
, and for
100 mm (4")
0.9965
Low Cal Pt.
– 1000 mm
Page 59