Siemens SITRANS LG250 Operating Instructions Manual page 41

Echo curve
Simulation
Echo curve memory
PBD-51041053
Information:
If one of the display values flashes, there is actually no valid value
available.
The menu item "Echo curve" shows the signal strength of the echoes
over the measuring range in V. The signal strength enables an evalua-
tion of the quality of the measurement.
With the following functions you can zoom part sections of the echo
curve.
•
"X-Zoom": Zoom function for the meas. distance
•
"Y-Zoom": 1, 2, 5 and 10x signal magnification in "V"
•
"Unzoom": Reset the presentation to the nominal measuring range
without magnification
In this menu item you can simulate measured values via the current
output. This allows the signal path to be tested, e.g. through down-
stream indicating instruments or the input card of the control system.
Select the requested simulation variable and set the requested value.
Push the [ESC] key to deactivate the simulation.
Information:
The simulation is terminated automatically 60 minutes after the activa-
tion of the simulation.
With the menu item "Setup" the echo curve it is possible to save at
the time of setup. This is generally recommended; for using the Asset
Management functions it is necessary. If possible, the curve should
be saved with a low level in the vessel.
With this, you can detect signal changes over the operating time. With
the adjustment software PACTware and the PC, the high-resolution
echo curve can be displayed and used to compare the echo curve of
the setup with the actual echo curve.
SITRANS LG250 - Operating Instructions
41