ABB FSM4000 - Page 55

FSM4000 ELECTROMAGNETIC FLOWMETER | DS/FSM4000-EN REV. L
55
Extended diagnostic functions
Recorded parameters / fingerprints
Cyclical (10 sec to 7 days) or manual acquisition of
parameters.
The data sets are stored in the transmitter FRAM (with time
stamp / operating hours counter). A maximum of 10 sets can
be stored. When the eleventh record is stored, the oldest data
set is overwritten automatically.
Magnet coil circuit
AC voltage
AC
DC resistance (primary value for
temperature)
Temperature
Insulation resistance (ground)
DAC value (primary value for coil
current)
Electrode circuit
Magnetic linearity
Electrode voltage E1 (primary value
for electrode balance)
Electrode voltage E2 (primary value
for electrode
balance)
Electrode balance
Quality (signal-to-
noise ratio)
The parameters can be checked for min.-max. errors. If the
value is above or below the specified limit, a diagnostic error
or warning, depending on the configuration, is triggered. The
‘fingerprint’ database integrated in the transmitter allows
you to easily compare the values at the time of factory
calibration or commissioning, for example, with the currently
recorded values.
Users can store up to three different fingerprint data sets
(commissioning, product1, product2) in the fingerprint
database. The default fingerprint (optional) cannot be
overwritten.
Detectable error states
Monitoring of ...
Detection of ...
Coil current
/ coil
voltage / DAC value
Changes in the driver or coil
circuit.
Coil resistance
Changes in coil circuit, e.g., fine short.
Coil temperature
Risk of overheating due to fluid.
Coil insulation resistance
Problems with the coil insulation. Can be
caused, e.g., by dampness in the flowmeter
sensor or in the conne
ction box.
Linearity of magnetic
circuit
External magn. field interference on the EMF,
resulting in loss of accuracy.
Signal quality (signal
-to-
noise ratio)
Changes in fluid, e.g., gas bubbles,
increased/reduced amount of solids.
Electrode
balance
Distorted flow profile, e.g., due to improper
installation.
Detect interference in electrode circuit,
e.g.,
failure of electrode due to insulating
coating or a collapsed liner (vacuum shock).
Backward compatibility
The transmitter is suitable for connecting to flowmeter
sensors over 20 years old. Occasionally, an adapter board
may be required (for details, see the FSM4000 operating
instructions).
The following flowmeter sensors are supported:
DS21, DS21F, DS41F, 10DS3111 (A-E), 10DI1425, 10D1422,
10D1462, 10D1472