User's Manual

7ML19985LY01 SITRANS LR560 (FF) – INSTRUCTION MANUAL Page 143
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D: Technical Reference
Measurement Range
Near Range (2.4.1.)
Near Range programs SITRANS LR560 to ignore the zone in front of the antenna. The
default blanking distance is 27.8 cm (0.91 ft) from the sensor reference point.
Near Range allows you to increase the blanking value from its factory default. But Auto
False Echo Suppression (2.4.8.1.) is generally recommended in preference to extending
the blanking distance from factory values.
Far Range (2.4.2.)
Far Range allows the echo processing to see and process signals that are lower than the
Low Calibration setting.
Potential uses are:
• In applications where the base of the vessel is conical or parabolic. A reliable echo
may be available below the vessel empty distance, due to an indirect reflection
path. Increasing Far Range to 30% or 40% can provide stable empty vessel readings.
• Where Low Calibration setting is above vessel empty level, but the vessel is emptied
occasionally. In this case the echo will be tracked below the Low Calibration setting
and the device will maintain a zero level reading.
Example after Auto False Echo Suppression
learned
TVT
material echo
false echo
echo marker
Auto False Echo
Suppression
Range set to 2 m
Auto False Echo
Suppression Range
default
TVT