VEGA PLICSCOM - Manual (Page 16)

16
5 Setup - Sensors up to software 3.99
PLICSCOM •
36433-EN-130228
•
Min. and max. temperature: ultrasonic sensors, pressure transmit-
ters
Peak value
When non-contact level sensors are used, the measurement can be
influenced by the respective process conditions. In this menu item,
the measurement reliability of the level echo is displayed as dB value.
The measurement reliability equals signal strength minus noise. The
higher the value, the more reliable the measurement. With a function-
ing measurement, the values are > 10 dB.
The instrument status is displayed in this menu item. If no failure is
detected by the sensor, "OK" will be displayed. If a failure is detected,
there will be a sensor-specific flashing fault signal, for example
"E013". The failure is also displayed in clear text, for example "No
measured value available".
Information:
The fault message as well as the clear text indication are also carried
out in the measured value display.
Meas. reliability
Sensor status
In ultrasonic and radar sensors as well as sensors with guided
microwave, the "Echo curve" represents the signal strength of the
echoes over the measuring range. The units of the signal strength are
"dB" (ultrasonic and radar) and "Volt" (guided microwave). The signal
strength allows an assessment of the quality of the measurement.
With ultrasonic and radar sensors, the "False echo curve" repre-
sents the saved false echoes (see menu "Service") of the empty
vessel with signal strength in "dB" over the measuring range.
Up to 3000 measured values are recorded (depending on the sensor)
when starting a "Trend curve". Then the values can be displayed on
a time axis. The oldest measured values are always deleted.
In the menu item "Choose curve", the respective curve is selected.
Curve selection
Echo curve
▼
Diagnosis/Measurement
reliability
Diagnostics/Device
status
Diagnosis/Curve selec-
tion
1) Pressure: -50 … +150 % of the nominal pressure range; temperature:
-50 … +150 °C.