124
CoriolisMaster FCB400, FCH400
CORIOLIS MASS FLOWMETER | OI/FCB400/FCH400-EN REV. E
… 9 Operation
VeriMass erosion monitor
The integrated diagnosis function VeriMass allows the status of
the meter tube to be monitored. This enables changes due to
material erosion and the formation of deposits on the meter
tube walls to be identified at an early stage.
If the set limit value is exceeded, an alarm is triggered, for
example via the programmable digital output or HART,
depending on the configuration.
The limit value for the erosion monitor can be set either
automatically or manually.
Automatic adjustment
The transmitter monitors the sensor's driver current over a
prolonged period and creates a ‘fingerprint’ for the relevant
application. The transmitter generates a corresponding
tolerance value for deviations in the driver current.
The transmitter compares the behavior of the driver current with
the generated fingerprint and triggers the relevant error
message in the event of prolonged deviations.
Manual adjustment
For applications where automatic adjustment of the erosion
monitor does not provide a satisfactory result, the erosion
monitor can be adjusted manually.
For more information, please contact ABB Service or the sales
organization.
Setup
The following process conditions must be observed to ensure
that the transmitter can perform the adjustment process
successfully:
• The measuring medium has a viscosity similar to that of
water and below 10 cP.
• For liquid measuring media, no gas bubbles or air
pockets may be present in the meter tube.
• The pressure and temperature in the meter tube
correspond to standard operating conditions.
• The process conditions during the adjustment period
correspond to standard conditions for the selected
application.
Automatic adjustment via the transmitter menu
The following steps must be performed when adjusting the
erosion monitor automatically:
1.
The VeriMass function must be active („Device Setup /
...Transmitter / ...Feature Settings menu, parameter
‘VeriMass On / Off’).
2. In the ‘Diagnostics / ...Meter Erosion Mon.’ menu, set the
parameter ‘Control Type’ to ‘Auto’.
3.
In the ‘Diagnostics / ...Meter Erosion Mon.’ menu, set the
parameter ‘Self Adjust Time’ to the required duration of
the balancing process.
Recommended settings
Self Adjust Time
Several days or weeks depending on
the application
4.
In the ‘Diagnostics / ...Meter Erosion Mon.’ menu, start
the automatic balancing process via the parameter ‘Start
Adjust’.
The transmitter now generates the ‘fingerprint’ for the erosion
value and an appropriate tolerance value for the specified time.
Once automatic adjustment is complete, the driver current is
monitored constantly and compared with the ‘fingerprint’
generated.
