Siemens SITRANS LUT400 - Measurement Response; Damping

SITRANS LUT400
296 Operating Instructions, 07/2019, A5E33329501-AC
A.2.3 Measurement Response
Note
Units are defined in
Units (2.1.1.) (Page 168) and are in meters by default.
Response Rate 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/min by default) is established, a response rate can
be selected that is slightly higher than the application rate. Response Rate automatically
adjusts the three rate parameters that affect the output response rate.
When Response Rate
set to:
Fill Rate per Minute (2.3.1.)
(Page 174)/Empty Rate per Minute
(2.3.2.) (Page 174)
automatically
adjust to:
Damping Filter (2.3.3.) (Page 174)
automatically adjust to:
*
Slow
0.1 m/min
100.0 s
Medium
1.0 m/min
10.0 s
Fast
10.0 m/min
0.0 s
A.2.3.1 Damping
Sensor Offset (2.2.3.) (Page 172) smooths out the response to a sudden change in level.
This is an exponential filter and the engineering unit is always in seconds.
In 5 time constants, the output rises exponentially: from 63.2% of the change in the first time
constant, to almost 100% of the change by the end of the 5th time constant.
Damping example:
time constant = 2 seconds
input (level) change = 2 m