Diagnosis, Asset Management And Service; Maintenance; Diagnosis Memory - Vega VEGABAR 83 Operating Instructions Manual

Maintenance

Proof test
Measured value memory
VEGABAR 83 • 4 ... 20 mA/HART

10 Diagnosis, asset management and service

10.1 Maintenance
If the device 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.
To identify possible undetected, dangerous failures, the safety func-
tion of the instrument must be checked in adaquate intervals by a
proof test.
During the function test, the safety function must be treated as unsafe.
Keep in mind that the function test influences downstream connected
devices.
If one of the tests proves negative, the entire measuring system must
be switched out of service and the process held in a safe state by
means of other measures.
You can find detailed information on the proof test in the Safety
Manual (SIL).

10.2 Diagnosis 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.
Depending on the instrument version, values that can be stored are
for example:
•
Level
•
Process pressure
•
Differential pressure
•
Static pressure
•
Percentage value
•
Scaled values
•
Current output
•
Lin. percent
•
Measuring cell temperature
•
Electronics temperature
When the instrument is shipped, the measured value memory is ac-
tive and stores pressure value and measuring cell temperature every
10 s, with electronic differential pressure also the static pressure.
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.
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