VEGA VEGABAR 21 - Manual (Page 23)

VEGABAR 21 23
Diagnosis
5 Diagnosis
5.1 Maintenance
VEGABAR process pressure transmitters are
maintenance free.
5.2 Failure removal
Fault signals
With selftest and continuous self-monitoring
VEGABAR offers high reliability. If however
interferences occur, the diagnosis of VEGA-
BAR distinguishes between atypical process
conditions and faults in the VEGABAR.
Atypical process conditions
Exceeding or decreasing of the measuring
range limits (fault signal extinguishes when
the value is again in the measuring range).
Failure in VEGABAR
Failure in the electronics, interferences or
damages in the measuring cell.
The below table assists in the processing of
fault signals.
Reason Fault signal via
DOT-matrix Bargraph Current
Digital indication output
Clear de- “OPERATE Bargraph 0 %
creasing or ???? or 100 % Current
exceeding bar“ Digital value value
of the flashes 3,6 mA
measuring or
range 22 mA
Overload Bargraph 0 %
range of the or 100 %, digital
measuring value: four flashing
cell segments “- - - -”
Failure in all segments
VEGABAR flash
On instruments with menu-guided adjustment
with additional functions, possible reasons
are displayed in the menu point “Diagnosis
no.“ in case of failure.
Diagnosis no. Meaning
1 No frequency from C/f-converter
2 Frequency signal of the capacitor
outside the limit values
3 Frequency signal of the reference
capacitor outside the limit values
4 Frequency signal temperature outside
the limit values
7 Communication to EEPROM interfered
9 Error in CRC-check sum EEPROM
Fault finding
If the indicated value does not correspond to
the level in the vessel or to the process pres-
sure, the following measures have to be
carried out:
- check the pressure compensation (only
with overpressure measuring ranges)
- check the electrical connection.
Checking pressure compensation
Open the housing of VEGABAR. The meas-
ured value should not change. However if the
indicated value changes, compensation of
the atmospheric pressure is not ensured and
the measured value will be affected. Check
the breather facility on the VEGABAR-hous-
ing.