Exchanging The Electronics Module - Siemens SITRANS LG270 Operating Instructions Manual

Fault description
4. Measured value re-
mains momentarily
unchanged during fill-
ing and then jumps to
the correct level
5. Measured value
jumps sporadically to
100 % during filling
6. Measured value
jumps to ≥ 100 % or
0 m distance
Measurement error during emptying
Fault description
7. Measured value re-
mains unchanged in
the close range during
emptying
8. Measured value re-
mains reproducible
in one position during
emptying
Reaction after fault recti-
fication
54
Error pattern Cause
•
Turbulence on the product
surface, quick filling
0
time
•
Changing condensation or
contamination on the probe
0
time
•
Level echo is no longer detected
in the close range due to false
signals in the close range. The
sensor goes into overfill protec-
tion mode. The max. level (0 m
0 time
distance) as well as the status
message "Overfill protection"
are outputted.
Error pattern Cause
•
False signal larger than the level
echo
•
Level echo too small
0 time
•
Stored false signals in this
position are larger than the level
echo
0
time
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.
9.5

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:
SITRANS LG270 - Operating Instructions
Rectification
•
Check parameters, change if
necessary, e.g. in dosing vessel,
reactor
•
Carry out a false signal suppres-
sion
•
Eliminate false signals in the
close range
•
Check installation conditions
•
If possible, switch off the func-
tion "Overfill protection"
Rectification
•
Eliminate false signals in the
close range
•
Remove contamination on the
probe. After having removed the
source of the false signals, the
false signal suppression must
be deleted.
•
Carry out a new false signal
suppression
•
Delete false signal suppression
•
Carry out a new false signal
suppression
PBD-51041071