NCR-80 Four-wire 4-20 mA/HART
925-0332 Rev B
9 Diagnosis, asset management and service
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9 Diagnosis, asset management and service
9.1 Maintenance
If the instrument is used correctly, no maintenance is required in normal operation.
In some applications, buildup on the antenna system can influence the measuring result. De
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pending on the sensor and application, take measures to avoid heavy soiling of the antenna
system. If necessary, clean the antenna system in certain intervals.
9.2 Measured value and event memory
The instrument has several memories which are available for diagnostic purposes. The data re-
main 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 con-
tains date/time as well as the respective measured value. Storable values are for example:
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Distance
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Filling height
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Percentage value
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Lin. percent
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Scaled
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Current value
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Meas. certainty
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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:
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Modification of a parameter
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Switch-on and switch-off times
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Status messages (according to NE 107)
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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 measurement conditions during operation or buildup on the sensor
can thus be recognized. The echo curve of the setup is stored via:
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PC with PACTware/DTM
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Control system with EDD
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Display and adjustment module
