Configuring The Sensor; Changing The Distance Measurement Unit; Selecting The Application Category; Disabling Tracking Of False Echoes - ABB LWT300 series User Manual

NOTICE
Unlinking the primary value from the 4 – 20 mA values requires that you manually set
4 mA and 20 mA values afterwards. Menu items for these two values appears in the PV
Setup menu to do just that.
Values are automatically relinked if either the 4 mA or 20 mA value is modified at a
later time.
Setting unlinked 4 mA and 20 mA values
To set 4 mA and 20 mA values after unlinking them from the empty/full values:
1 Select Device Setup > 4 mA (LRV) or 20 mA (URV).
2 Press Edit.
3 Set the appropriate value and press OK.

Configuring the sensor

Certain sensor parameters can be configured to improve measurement accuracy. This configuration
can be performed from the Sensor Setup menu under the Device Setup menu.

Changing the distance measurement unit

The default unit for distance measurements (ullage, level, distance) is the meter (m).
To change that unit:
1 From the Device Setup menu, select Sensor Setup > Length Unit.
2 Press Edit.
3 Highlight the appropriate length unit and press OK.

Selecting the application category

The application category is the type of media in which the sensor will be used. Applications are based
on the dielectric constant (DC) value of the medium measured. The default application category is
Water-based (DC>10).
To set the application category:
1 Select Device Setup > Sensor Setup > Application Category.
2 Press Edit.
3 Highlight the appropriate application based on the measured DC of the medium and press OK.

Disabling tracking of false echoes

The tracking of false echoes by LevelExpert™ provides means of ensuring a certain level of measurement
accuracy despite the presence of false echoes (e.g., 2 mm accuracy cannot be achieved in the presence of
false echoes). This feature automatically identifies and tracks false echoes in time, accounting for them
while the sensor is measuring changing levels. False echo tracking is enabled by default.
Certain vessel content characteristics (e.g., agitation, emulsion, the presence of foam, etc.) could
require disabling of this feature.
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User Guide