Vega VEGAPULS C 21 User Manual

40
11 Diagnostics and servicing
VEGAPULS C 21 • Modbus and Levelmaster protocol
58343-EN-200806
1
2
Level
time
0
1 Real level
2 Level displayed by the sensor
Note:
If the output level is constant, the cause could also be the fault setting
of the current output to " Hold value".
If the level is too low, the reason could be a line resistance that is too
high
Liquids: Measurement error at constant level
Fault description Cause Rectication
Measured value shows a too
low or too high level
Level
time
0
Min./max. adjustment not correct Adapt min./max. adjustment
Incorrect linearization curve Adapt linearization curve
Measured value jumps to-
wards 100 %
Level
time
0
Due to the process, the amplitude of the
level echo sinks
A false signal suppression was not car-
ried out
Carry out a false signal suppression
Amplitude or position of a false signal
has changed (e.g. condensation, build-
up); false signal suppression no longer
matches actual conditions
Determine the reason for the changed
false signals, carry out false signal sup-
pression, e.g. with condensation.
Liquids:Measurementerrorduringlling
Fault description Cause Rectication
Measured value remains un-
changedduringlling
Level
time
0
False signals in the close range too big
or level echo too small
Strong foam or vortex generation
Max. adjustment not correct
Eliminate false signals in the close
range
Check measuring point: Antenna should
protrude out of the threaded mounting
socket, possible false echoes through
angesocket?
Remove contamination on the antenna
In case of interferences due to instal-
lations in the close range, change
polarisation direction
Create a new false signal suppression
Adapt max. adjustment

Vega VEGAPULS C 21 Specifications

General

Brand	Vega
Model	VEGAPULS C 21
Category	Accessories
Language	English