Operating Instructions

Table Of Contents
A.4 Measurement Range
A.4.1 Near Range
Near Range programs (2.2.1.12) (Page 81) SITRANS LR260 to ignore the zone in front of the
antenna. The default blanking distance is 50 mm (1.97 inch) from end of horn antenna.
Near Range allows you to increase the blanking value from its factory default. Auto False Echo
Suppression (2.2.5.2) (Page 87) is generally recommended in preference to extending the
blanking distance from factory values.
A.4.2 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.
Note
On 30 m vessel, range extension cannot exceed 31.5 m.
A.5 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.
Fill Rate 2.2.7.2.
(Page 90) (FILL RATE/
MIN)
Fill Rate 2.2.7.2.
(Page 90) (FILL RATE/
MIN) Empty rate 2.2.7.3.
(Page 90) (EMPTY
RATE/MIN)
Echo Lock
2.2.4.2.1.
(Page 83)
Failsafe Timer
2.4.1.
(Page 94)
(time in min.)
Damping Filter
2.2.4.3.2.
(Page 85)
Slow 0.1 m/min MAX. VERFI‐
CATION
100 60
Medium 1 m/min MAX. VERFI‐
CATION
10 10
Fast * 10 m/min MAX. VERFI‐
CATION
1 0
Appendix A: Technical reference
A.5 Measurement Response
SITRANS LR260 with mA/HART
Operating Instructions, 11/2019, A5E32337683-AD 155