Damping; Analog Output; Sensor Mode; A.3.9 Damping - Siemens SITRANS LR560 Operating Instructions Manual

A.3.9

Damping

DAMPING FILTER (2.2.3.) (Page 112) 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
A.4

Analog output

The mA Output (current output) is proportional to material level in the range 4 to 20 mA. 0% and
100% are percentages of the full-scale reading (m, cm, mm, ft, in). Typically mA output is set so
that 4 mA equals 0% and 20 mA equals 100%.
While the device is in PROGRAM mode, the output remains active and continues to respond to
changes in the device.
SITRANS LR560 automatically returns to Measurement mode after a period of inactivity in
PROGRAM mode.
A.4.1

Sensor Mode

This parameter controls the input. Depending on the reference point used, the measurement
reports either Level, Space, or Distance. By default Sensor Mode is set to Distance.
Operation
SITRANS LR560 (mA/HART)
Operating Instructions, 06/2017, A5E34647946-AD
Description
LEVEL Measurement from reference point to materi-
al surface
SPACE Measurement from reference point to materi-
al surface
DISTANCE Measurement from reference point to materi-
al surface
Technical reference
A.4 Analog output
Reference point
Low Calibration Point (process
empty level)
High Calibration Point (process
full level)
Sensor Reference Point
187