Vega VEGAPULS 67 Operating Instructions Manual page 47

Diagnostics - Echo curve
memory
Additional adjustments -
Device units
Additional adjustments -
False signal suppression
VEGAPULS 67 • 4 ... 20 mA/HART - four-wire
The selected curve is continuously updated. A submenu with zoom
functions is opened with the [OK] key:
•
"X-Zoom": Zoom function for the meas. distance
•
"Y-Zoom": 1, 2, 5 and 10x signal magnification in "dB"
•
"Unzoom": Reset the presentation to the nominal measuring range
without magnification
With the function "Echo curve memory" the echo curve can be saved
at the time of setup. This is generally recommended; for using the As-
set Management functions it is absolutely necessary. If possible, the
curve should be saved with a low level in the vessel.
With the adjustment software PACTware and the PC, the high resolu-
tion echo curve can be displayed and used to recognize signal
changes over the operating time. In addition, the echo curve of the
setup can be also displayed in the echo curve window and compared
with the actual echo curve.
In this menu item you select the measured variable of the system and
the temperature unit.
The following circumstances cause interfering reflections and can
influence the measurement:
•
High sockets
•
Vessel installations such as struts
•
Agitators
•
Buildup or welded joints on vessel walls
Note:
A false signal suppression detects, marks and saves these false
signals so that they are no longer taken into account in the level
measurement.
This should be done with a low level so that all potential interfering
reflections can be detected.
Proceed as follows:
1. Select with [->] the menu item "False signal suppression" and
confirm with [OK].
6 Set up with the display and adjustment module
47