Burkert 8137 Manuel D'instructions page 39

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Reaction when malfunc-
tions occur
Causes of malfunction
Reaction when malfunc-
tions occur
Fault rectification
Checking the 4 ... 20 mA
signal
LEVEL TRANSMITTER 8137 • 4 ... 20 mA/HART
8 Maintenance and fault rectification
8.1 Maintenance
When used in the correct way, no special maintenance is required in
normal operation.
8.2 Remove interferences
The operator of the system is responsible for taken suitable measures
to remove interferences.
A maximum of reliability is ensured. Nevertheless, faults can occur
during operation. These may be caused by the following, e.g.:
Sensor
l
Process
l
Power supply
l
Signal processing
l
The operator of the system is responsible for taken suitable measures
to remove interferences.
The first measures to be taken are to check the output signal and
evaluate fault messages via the indicating/adjustment module. The
procedure is described below.
Connect a handheld multimeter in the suitable measuring range
according to the wiring plan.
4 ... 20 mA signal not stable
?
Level fluctuations
l
à Set damping via the indicating and adjustment module
? 4 ... 20 mA signal missing
Wrong connection
l
à Check connection according to chapter "Connection steps"
and if necessary, correct according to chapter "Wiring plan"
No power supply
l
à Check cables for breaks; repair if necessary
Operating voltage too low or load resistance too high
l
à Check, adapt if necessary
Current signal greater than 22 mA or less than 3.6 mA
?
Electronics module defective
l
à Exchange instrument or return instrument for repair
In Ex applications, the regulations for the wiring of intrinsically safe
circuits must be observed.
8 Maintenance and fault rectification
39