VEGA VEGABAR 81 4 … 20 mA_HART - Operating Instructions - Manual (Page 53)

53
9 Diagnosis, asset management and service
VEGABAR 81 • 4 … 20 mA/HART
45018-EN-131010
9 Diagnosis, asset management and service
9.1 Maintenance
If the instrument is used properly, no special maintenance is required
in normal operation.
In some applications, product buildup on the diaphragm can influence
the measuring result. Depending on the sensor and application, take
precautions to ensure that heavy buildup, and especially a hardening
thereof, is avoided.
9.2 Diagnosis memory
The instrument has several memories which are available for diagno-
sis purposes. The data remain even with voltage interruption.
Up to 60,000 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:
•
Pressure
•
Differential pressure
•
Level
•
Flow
•
Density
•
Interface
•
Percentage value
•
Lin. percent
•
Scaled values
•
Measuring cell temperature
•
Electronics temperature
When the instrument is shipped, the measured value memory is
active, saving distance, measurement certainty and electronics tem-
perature every minute.
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)
The data are read out via a PC with PACTware/DTM or the control
system with EDD.
9.3 Asset Management function
The instrument features self-monitoring and diagnostics according
to NE 107 and VDI/VDE 2650. In addition to the status messages in
Maintenance
Measured value memory
Event memory