Page 116 SITRANS LR250 (PROFIBUS PA) – INSTRUCTION MANUAL 7ML19985JF02
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D: Technical Reference
Measurement Range
Near Range
Near Range (2.2.3.5.1.) programs SITRANS LR250 to ignore the zone in front of the
antenna. The default blanking distance is 50 mm (1.97") from end of horn antenna.
Near Range allows you to increase the blanking value from its factory default. But Auto
False Echo Suppression (2.2.4.2.) is generally recommended in preference to extending
the blanking distance from factory values.
Far Range
Far Range (2.2.3.5.2.) can be used in applications where the base of the vessel is conical
or parabolic. A reliable echo may be available below the vessel empty distance, due to an
indirect reflection path.
Increasing the Far Range to 30% or 40% can provide stable empty vessel readings.
Measurement Response
Response Rate (2.2.6.1.) limits the maximum rate at which the display and output respond
to changes in the measurement. There are three preset options: slow, medium, and fast.
Once the real process fill/empty rate (m/s by default) is established, a response rate can
be selected that is slightly higher than the application rate. Response Rate automatically
adjusts the filters that affect the output response rate
Note: Sensor units are in meters by default.
Response Rate (2.2.6.1.)
Fill Rate (2.2.6.2.)/
Empty rate (2.2.6.3.)
Filter
Time
Constant
(2.3.1.4.)
LOE
Timer
(2.4.1.)
* Slow
0.1 m/min (0.32 ft/min) 0.1 m/min (0.32 ft/min) 10 s 100 min
Medium
1.0 m/min (3.28 ft/min) 1.0 m/min (3.28 ft/min) 10 s 10 min
Fast
10.0 m/min (32.8 ft/min) 10.0 m/min (32.8 ft/min) 0 s 1 min
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