Siemens SITRANS LVL200E Руководство по эксплуатации - Страница 24
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Reaction when malfunc-
tion occurs
Causes of malfunction
Fault rectification
Checking the switching
signal
Error
SITRANS LVL200E sig-
nals "covered" without
being submerged (overfill
protection)
SITRANS LVL200E sig-
nals "uncovered" when
being submerged (dry run
protection)
Signal lamp flashes red
Reaction after fault recti-
fication
24
7 Maintenance and fault rectification
7.1
Maintenance
If the instrument is used properly, no special maintenance is required
in normal operation.
7.2
Rectify faults
The operator of the system is responsible for taking suitable meas-
ures to rectify faults.
SITRANS LVL200E offers maximum reliability. Nevertheless, faults
can occur during operation. These may be caused by the following,
e.g.:
•
Sensor
•
Process
•
Voltage supply
•
Signal processing
The first measure to take is to check the output signal. In many cases,
the causes can be determined this way and the faults quickly rectified.
Cause
Operating voltage too low
Electronics defective
Unfavourable installation
location
Buildup on the vibrating el-
ement
Wrong characteristic se-
lected
Error on the vibrating el-
ement
Interference on the elec-
tronics module
instrument defective
Depending on the reason for the fault and the measures taken, the
steps described in chapter "Set up" may have to be carried out again.
SITRANS LVL200E - Operating Instructions
Rectification
Check operating voltage
Press the characteristic reversal switch. If the instru-
ment then changes the mode, the vibrating element
may be covered with buildup or mechanically damaged.
Should the switching function in the correct mode still
be faulty, return the instrument for repair.
Push the characteristic reversal switch. If the instrument
then does not change the mode, the electronics mod-
ule may be defective. Exchange the electronics module.
Mount the instrument at a location in the vessel where
no dead zones or air bubbles can form.
Check the vibrating element and the sensor for buildup
and remove the buildup if there is any.
Set the correct characteristics on the characteristics re-
versal switch (overflow protection, dry run protection).
Wiring should be carried out according to the idle cur-
rent principle.
Check if the vibrating element is damaged or extreme-
ly corroded.
Exchanging the electronics module
Exchange the instrument or send it in for repair
*7ML19985KY01*