Siemens SITRANS LR 400 Instruction Manual page 42

4.2.3.4: Window Tracking (F = on)
Value
A window follows the measured value which it is forced to track. The window size is
calculated from the set filling speed. The parameter "window tracking" would be
switched off for applications where the SITRANS LR 400 is unable to keep up to level
changes.
4.2.3.5: Tank Empty Detection (F = on)
Value
Sometimes in vessels with a parabolic or conical bottom there is no signal reflection
when the vessel is empty. The vessel empty detection recognizes this state and displays
the measured value for an empty vessel.
If the measuring medium's signal disappears occasionally (foam, turbulence, etc.), it may
help to switch this parameter off.
4.2.3.6: Auto Fix Distance (F = off)
Automatic fixed target detection
Value
Fixed targets are set automatically and their echoes suppressed. Automatic setting of the
fixed targets depends on the set filling speed. However, the measured value display may
trace the level correctly but jump to an incorrect value, i.e. a multiple echo, at constant
level after a longer time. In that case you may switch off the automatic fixed target
detection. It is suggested that Auto False Echo Suppression (4.2.3.9 and 4.2.3.A) be used
instead of Auto Fix Distance (4.2.3.6).
4.2.3.7: Fix Distance List
Manual input of up to nine fixed targets
Value
Here you can enter the distances from the flange of up to nine known fixed targets in any
order in the units system selected according to parameter 4. 1 . 1 . The fixed targets of this
list are considered to be accurate within ±15 cm.
Page 38 SITRANS LR 400 – INSTRUCTION MANUAL DRAFT
on
off
on
off
on
off
numerical value
7ML19985FH01