Endress+Hauser Levelflex FMP55 - DC Value; Signal Quality

Levelflex FMP55 HART Operating menu
Endress+Hauser 133
Signal quality
Navigation  Setup → Signal quality
Description Displays the signal quality of the evaluated echo.
Additional information Meaning of the display options
• Strong
The evaluated echo exceeds the threshold by at least 10 mV.
• Medium
The evaluated echo exceeds the threshold by at least 5 mV.
• Weak
The evaluated echo exceeds the threshold by less than 5 mV.
• No signal
The device does not find a usable echo.
The signal quality indicated in this parameter always refers to the currently evaluated
echo: either the level/interface echo
5)
or the end-of-probe echo. To differentiate between
these two, the quality of the end-of-probe echo is always displayed in brackets.
In case of a lost echo (Signal quality = No signal) the device generates the following
error message:
• F941, for Output echo lost (→  159) = Alarm.
• S941, if another option has been selected in Output echo lost (→  159).
DC value 
Navigation  Setup → DC value
Prerequisite The device has the "interface measurement" application package
6)
.
Description Specify relative dielectric constant ε
r
of the upper medium (DC
1
).
User entry 1.0 to 100
Factory setting 2.0
5) Of these two echos the one with the lower quality is indicated.
6) Product structure: Feature 540 "Application Package", Option EB "Interface measurement"