Measurement Range; Near Range; Far Range; Measurement Response - Siemens Sitrans LR250 Instruction Manual

Measurement Range

Near Range

2.2.1.11. Near Range
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
blanking distance from factory values.

Far Range

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 range extension to 30% or 40% can provide stable empty vessel readings.

Measurement Response

The measurement response (response rate) limits the maximum rate at which the display
and output respond to changes in the measurement. Once the real process fill/empty rate
(m/s) is established, a response rate can be selected that is slightly higher than the
application rate. The response rate automatically adjusts the filters that affect the output
response rate.
There are three preset options: slow, medium, and fast.
2.2.7.2. Fill
Rate
Slow *
Medium
Fast
Page 106 SITRANS LR250 (HART) – INSTRUCTION MANUAL
programs SITRANS LR250 to ignore the zone in front of the antenna.
is generally recommended in preference to extending the
2.2.7.2. Fill Rate
/
2.2.7.3. Empty rate
0.1 m/min
1 m/min
10 m/min
2.2.4.2.1. Echo Lock
MATLAGITATOR
MATLAGITATOR
MATLAGITATOR
2.2.5.6.
2.4.1. Fail-safe
Timer
(time in min.)
100
10
1
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