7ML19985JF02 SITRANS LR250 (PROFIBUS PA) – INSTRUCTION MANUAL Page 61
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Parameters
If the vessel bottom is being reported as the level instead of the
actual material level (at low level conditions), or if the dielectric
constant of the liquid to be monitored is less than 3, we recommend
setting Position to Hybrid and CLEF Range to 0.5 m (1.64 ft).
2.2.3.2. Sampling
Provides a method of checking the reliability of a new echo before
accepting it as the valid reading, based on numbers of samples above or
below the currently selected echo.
2.2.3.2.1. Echo Lock
Selects the measurement verification process. See Echo Lock
(2.2.3.2.1.) on page 114 for more details.
For radar applications, Material Agitator is the most often used
setting, to avoid agitator blade detection.
2.2.3.2.2. Sampling up
Specifies the number of consecutive echoes that must appear above
the echo currently selected, before the measurement is accepted as
valid.
Options
3
Center
4*
Hybrid (Center and CLEF)
5
CLEF (Constrained Leading Edge Fit)
Related
parameters
CLEF Range (2.2.3.4.1.)
Note: Ensure the agitator is always running while SITRANS LR250
is monitoring the vessel, to avoid stationary blade detection.
Options
Lock Off (no verification)
Maximum Verification
*
Material Agitator
Tot al Lock
Related
parameters
Fill Rate (2.2.6.2.)
Empty rate (2.2.6.3.)
Sampling up (2.2.3.2.2.)
Sampling down (2.2.3.2.3.)
Window (2.2.3.2.4.)
Algorithm (2.2.3.1.1.)
Values
Range: 1 to 50
Default: 5
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