Sensor Measurements; Trend; Fingerprint; Checking The Grounding - ABB ProcessMaster FEP300 Manual Del Usuario

Extended diagnostic functions
8.1.6

Sensor measurements

This function includes the monitoring of the sensor temperature and the monitoring of the
resistance of the flowmeter sensor's coils.
8.1.6.1 Sensor temperature monitoring
The temperature of the coils in the flowmeter sensor can be monitored by using adjustable
minimum / maximum limit values. When a set limit value is exceeded, an alarm is tripped via the
programmable digital output, depending on the configuration.
The coil temperature is a factor of the ambient and fluid temperatures. The measurement can,
e.g., be used to monitor overtemperature due to the fluid. The coil temperature is measured
indirectly via the coil DC resistance.
8.1.6.2 Monitoring of the sensor coil resistance
The coils in the flowmeter sensor can be monitored by using adjustable minimum / maximum
limit values for the coil resistance. When a set limit value is exceeded, an alarm is tripped via
the programmable digital output, depending on the configuration.
1) The specified nominal diameter range is valid for ProcessMaster, only. The nominal diameter range valid for
HygienicMaster is DN 10 ... 100 (3/8 " ... 4 ").
8.1.7

Trend

The device has an internal memory where the measured value for the electrode deposits and
the conductivity are cyclically stored as a data set with an adjustable time (1 min ... 45000 min).
A maximum of 12 data sets is stored. When the thirteenth record is stored, the oldest data set is
overwritten automatically.
The data sets can be read out or analyzed as a trend using the external diagnostic tool
(ScanMaster).
8.1.8

Fingerprint

The "fingerprint" database integrated in the transmitter allows you to compare the values at the
time of factory calibration or commissioning with the currently recorded values.
8.1.9

Checking the grounding

This function allows you to check the electrical grounding of the device.
While the check is in progress, no flow measurement can take place.
Conditions for using the function:
• The measuring tube must be completely full.
• No flow must occur in the flowmeter sensor.
Additional installation conditions:
• The flowmeter sensor must not be provided with a preamplifier.
68 - EN FEX300, FEX500 CI/FEX300/FEX500-X1