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Reaction when malfunction
occurs
Causes of Malfunction
13
SM720 Capacitive Level Transmitter
6 Maintenance and fault rectification
6.1
Maintenance
If the instrument is used properly, no special maintenance is
required in normal operation.
6.2
Rectify faults
The operator of the system is responsible for taking suitable
measures to rectifying faults.
SM720 offers maximum reliability. Nevertheless, faults can occur
during operation. These may be caused by the one following:
• Sensor
• Process
• Voltage supply
• Signal processing
The first measures to be taken are to check the output signals.
The procedure is described below the causes can be determined
and the faults rectified this way.
Connect a multimeter in the suitable measuring range according
to the wiring plan.
The following table describes possible errors in the current signal
and helps to eliminate them:
Error
•
The instrument
signals are
covered without
medium coverage
•
The instrument
signals are
covered
with medium
coverage.
Cause
Wrong mode
selected on the
signal conditioning
instrument
Operating voltage too
low
Short circuit in the
probe, e.g. because
of moisture in the
housing
Electronics Defective
Unfavorable
installation location
Alex Electronics Co.
Rectification
Change the mode by
mode transmitter
Check operating
voltage
Remove the
electronics module.
Check the resistance
between the marked
plug connections.
See the following
instructions.
Exchange the
instrument or send
it in
Check if the probe is
covered by buildup
on the socket. Mount
the instrument at
a location in the
vessel where e.g. no
mounds can form.
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