VEGA VEGAPULS WL 61 4 … 20 mA_HART - two-wire - Manual (Page 33)

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9 Diagnosis, Asset Management and service
VEGAPULS WL 61 • 4 … 20 mA/HART - two-wire
38061-EN-121011
9 Diagnosis, Asset Management and service
9.1 Maintenance
If the device is used correctly, no maintenance is required in normal
operation.
9.2 Measured value and event 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:
•
Distance
•
Filling height
•
Percentage value
•
Lin. percent
•
Scaled
•
Current value
•
Meas. reliability
•
Electronics temperature
When the instrument is shipped, the measured value memory is
active and stores distance, measurement certainty 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
•
Switching on and 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.
The echo curves are stored with date and time and the corresponding
echo data. The memory is divided into two sections:
Echo curve of the setup: This is used as reference echo curve for
the measurement conditions during setup. Changes in the measure-
ment conditions during operation or buildup on the sensor can thus
be recognized. The echo curve of the setup is stored via:
•
PC with PACTware/DTM
•
Control system with EDD
•
Indicating and adjustment module
Measured value memory
Event memory
Echo curve memory