120 FEP630, FEH630 ELECTROMAGNETIC FLOWMETER | OI/FEP630/FEH630-EN REV. D
… 9 Diagnosis / error messages
… Extended diagnostic functions
Monitoring the electrode impedance
The measurement monitors the impedance between the
measuring electrode and grounding and activates an alarm if the
impedance drops below a limit. The function is activated
together with the conductivity measurement.
Requirements for use:
• Conductivity of the measuring medium:
20 to 20000 μS/cm.
Additional installation conditions:
• When using plastic piping, install a grounding plate at the
front and back of the device.
• There must not be any deposits on the measuring
electrodes.
• The measuring tube must always be completely full, and
the measuring medium must have only minor deviations
in conductivity.
Measurements on the flowmeter
Coil inductance, coil current, coil resistance
The diagnosis of the coil in the sensor includes coil inductance,
current and resistance.
Flowmeter sensor temperature
The coil temperature monitoring triggers an alarm via the digital
output, if configured.
The minimum and maximum alarm value for the coil temperature
can be set.
The coil temperature is a function of the ambient temperature
and measuring medium temperature.
Compliance with the temperature specification of the sensor
liner can thus be monitored.
Setup
Menu / parameter Description
Diagnostics / ...Diagnosis Control / ...Diagnosis Coil
Coil Diag On/Off Activate the function.
Coil Resistor Display the coil resistance.
Coil Current Display the coil current.
Coil Inductance Display the coil inductance.
Coil Temperature Display the coil temperature within the sensor.
Coil Temperature Adj Measurement of coil temperature must be set in
accordance with the conditions on-site.
Temperature measured with a separate
thermometer can be entered here.
Coil Temp. Min Alarm Min. and max. alarm for the sensor temperature
(coil temperature). Can be used to monitor the
temperature limit of the meter tube liner
Coil Temp. Max Alarm
Transmitter monitoring
Monitoring the temperature of the electronic unit in the
transmitter triggers an alarm via the digital output, if
configured.
In the ‘...Diagnosis Values’, the current temperature as well as the
smallest and largest previously measured temperature is
displayed.
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