Far Range; Measurement Response; Ma Output; Damping Filter (2.2.4.3.2.) - Siemens SITRANS LR260 Operating Instructions Manual

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
1)
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
2.2.7.2. Fill
(FILL RATE/MIN)
Rate (FILL
2.2.7.3. Empty rate
RATE/MIN)
(EMPTY RATE/MIN)
Slow 0.1 m/min
Medium
Fast * 10 m/min
Output
mA
The mA output is proportional to the level, in the range 4 to 20 mA. Generally, the output is
set so that the output for 0% is 4 mA, and the output for 100% is 20 mA. 0 and 100% are
percentages of the full-scale reading (m, cm, mm, ft, in).
Level
Sensor
reference
point
High
Cal.
Point
Low
Cal.
Point
When SITRANS LR260 is put into P P ROGRAM mode it stops responding to the process. It
stores the most recent measurement, and holds the associated readings and mA signal
output. The instrument reverts to the parameter last addressed during the previous
program session.
1)
On 30 m vessel, range extension cannot exceed 31.5 m.
7ML19985KE02 SITRANS LR260 (HART) – INSTRUCTION MANUAL
2.2.4.2.1. Echo
/
Lock
MAX. VERFICATION
1 m/min MAX. VERFICATION
MAX. VERFICATION
Space
20 mA
100%
Space
Level
0%
4 mA
2.4.1. Fail-
2.2.4.3.2.
safe Timer
Damping
(time in
Filter
min.)
100 60
10 10
1 0
Distance
4 mA
0%
4 mA
0%
Distance
100%
20 mA
Page 95
100%
20 mA