Signal Processing - Siemens Sitrans LR200 Instruction Manual

2.8. Signal Processing

Note: Default settings in the parameter tables are indicated with an asterisk (*)
unless explicitly stated.
2.8.1. Near Range
The range in front of the device (measured from the sensor reference point)
within which any echoes will be ignored. This is sometimes referred to as
blanking or a dead zone. The factory set range is dependent on the antenna
type.
Values
a)
For the reference point for each configuration, see
Polypropylene Rod Antenna
Flange Adapter Versions
2.8.2. Far Range
Allows the material level to drop below Low Calibration Point without
generating a Loss of Echo (LOE) state. See Sensor Mode (2.2.2.) on page 75 for
an illustration.
Values
Use this feature if the measured surface can drop below the Low Cal. Point in
normal operation.
2.8.3. Propagation Factor
Notes:
• When operating with a waveguide antenna or stillpipe, values for CLEF
Range (2.8.4.4.) on page 88, and for the propagation factor, should be set
according to the antenna frequency and the antenna/pipe size. See the
tables below.
• For reliable results the horn 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.
Page 86 SITRANS LR200 (HART) – INSTRUCTION MANUAL
Range: 0 to 20 m (0 to 65.6 ft).
Default: Depends on the antenna. 0.3 m (1 ft), plus any shield length,
from the sensor reference point
100 mm shield version default is 0.42 m (0.3 m plus 0.12 m from device
reference to the end of the shield).
Min. detectable distance1)
See also
on page 13 for the standard version, or
, page 150 onwards.
Range: 0 to 23 m (0 to 75.4 ft). Min. value depends on the setting for Low
Calibration Pt. (2.3.1.).
Default: Low Calibration Point setting + 1 m (3.2 ft)
a)
on page 8.
Dimensions: Uni-Construction
7ML19985JP02
Appendix G: