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8 Diagnosis, asset management and service
LBR • Two-wire 4 … 20 mA/HART
62273-EN-200520
Fault description
Cause
Rectification
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.
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:
•
In the factory
•
Or on site by the user
In both cases, the serial number of the sensor is needed. The serial
numbers are stated on the type label of the instrument, on the inside
of the housing as well as on the delivery note.
When loading on site, the order data must first be downloaded from
the Internet (see operating instructions "
Electronics module
").
Caution:
All application-specific settings must be entered again. That's why you
have to carry out a fresh setup after exchanging the electronics.
If you saved the parameter settings during the first setup of the sen
-
sor, you can transfer them to the replacement electronics module. A
fresh setup is then not necessary.
8.6 How to proceed if a repair is necessary
If a repair should be necessary, please contact your contact person.
Reaction after fault recti-
fication
