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8 Diagnosis, asset management and service
LBR • Two-wire 4 … 20 mA/HART
62273-EN-200520
8 Diagnosis, asset management and service
8.1 Maintenance
If the device is used properly, no special maintenance is required in
normal operation.
In some applications, buildup on the antenna system can influence
the measuring result. Depending on the sensor and application, take
measures to avoid heavy soiling of the antenna system. If necessary,
clean the antenna system in certain intervals.
The cleaning helps that the type label and markings on the instrument
are visible.
Take note of the following:
•
Use only cleaning agents which do not corrode the housings, type
label and seals
•
Use only cleaning methods corresponding to the housing protec-
tion rating
8.2 Measured value and event memory
The instrument has several memories available for diagnostic pur-
poses. The data remain there even in case of voltage interruption.
Up to 100,000 measured values can be stored in the sensor in a ring
memory. Each entry contains date/time as well as the respective
measured value. Storable values are for example:
•
Distance
•
Filling height
•
Percentage value
•
Lin. percent
•
Scaled
•
Current value
•
Measurement reliability
•
Electronics temperature
When the instrument is shipped, the measured value memory is
active and stores distance, measurement reliability and electronics
temperature every 3 minutes.
The requested values and recording conditions are set via a PC with
PACTware/DTM or the control system with EDD. Data are thus read
out and also reset.
Up to 500 events are automatically stored with a time stamp in the
sensor (non-deletable). Each entry contains date/time, event type,
event description and value. Event types are for example:
•
Modification of a parameter
•
Switch-on and switch-off times
•
Status messages (according to NE 107)
•
Error messages (according to NE 107)
Maintenance
Precaution measures
against buildup
Cleaning
Measured value memory
Event memory
