User's Manual

A5E32337683 SITRANS LR260 (HART) – OPERATING INSTRUCTIONS Page 57
mmmmm
Parameters
2.2.4.2.6. Window
A "distance window" centered on the echo
1)
, used to derive the reading.
When a new measurement is in the window, the window is re-centered
and the reading is calculated.
When the value is 0, the window is automatically calculated after each
measurement.
• For slower Measurement Response values, the window is narrow.
• For faster Measurement Response values, the window becomes
progressively wider.
2.2.4.3. Filtering
2.2.4.3.2. Damping Filter
The time constant for the damping filter. The damping filter smooths out
the response to a sudden change in level. This is an exponential filter and
the engineering unit is always in seconds. See Damping on page 100 for
more detail.
2.2.4.3.6. Narrow Echo Filter
Filters out echoes of a specific width.
To remove a false echo from the Echo Profile, take its width in mm and
multiply it by 0.013. Enter the result.
For example, to filter out a spike with 500 mm width, enter 6 or 7 (the
closest integer product of 500 x 0.013).
When a value is keyed in, the nearest acceptable value is entered.
1)
See Echo Lock on page 97 for more detail.
Values
Range: 0 to 30 m
Default: 0
Note: The echo lock window is stored as standard sample, but
displayed in sensor units. Any value entered for the echo lock window
will be rounded to the nearest sample.
Values
Range: 0 to 1000 s
Default: 0 s
Values
Range: 0 to 255
0 = OFF
greater = wider
Related
parameters
Echo Confidence Long
2.2.4.3.7. Reform Echo