65
8 Diagnosis, asset management and service
VEGAPULS 69 • Modbus and Levelmaster protocol
47252-EN-210205
Measurement error during emptying
Fault description
Cause
Rectification
Measured value re-
mains unchanged in
the close range dur-
ing emptying
Level
time
0
False signal larger than the level echo
Level echo too small
Eliminate false signals in the close range.
Check: Antenna must protrude out of the
nozzle.
Remove contamination on the antenna.
Minimize interfering installations in the close
range by changing the polarization direction.
After eliminating the false signals, the false
signal suppression must be deleted. Carry
out a new false signal suppression.
Measured value
jumps sporadically
towards 100 % dur-
ing emptying
Level
time
0
Changing condensation or contamination
on the antenna
Carry out false signal suppression or in-
crease false signal suppression in the close
range by editing.
With bulk solids use radar sensor with purg-
ing air connection or flexible antenna cover.
Measured value
fluctuates around
10 … 20 %
Level
time
0
Various echoes from an uneven medium
surface, e.g. an extraction funnel
Check parameter "Type of medium" and
adapt, if necessary.
Optimize installation position and sensor
orientation.
Reflections from the medium surface via the
vessel wall (deflection)
Depending on the reason for the fault and the measures taken, the
steps described in chapter "
Setup
" must be carried out again or must
be checked for plausibility and completeness.
Should these measures not be successful, please call in urgent cases
the VEGA service hotline under the phone no.
+49 1805 858550
.
The hotline is also available outside normal working hours, seven
days a week around the clock.
Since we offer this service worldwide, the support is provided in
English. The service itself is free of charge, the only costs involved are
the normal call charges.
8.5 Exchanging the electronics module
If the electronics module is defective, it can be replaced by the user.
In Ex applications, only instruments and electronics modules with ap-
propriate Ex approval may be used.
If there is no electronics module available on site, the electronics
module can be ordered through the agency serving you. The electron-
ics modules are adapted to the respective sensor and differ in signal
output or voltage supply.
The new electronics module must be loaded with the default settings
of the sensor. These are the options:
Reaction after fault recti-
fication
24 hour service hotline
