Page 62 SITRANS LU10 – INSTRUCTION MANUAL 7ML19985AN02
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Enhancement Parameters
Echo Processing Parameters (P800 to P807)
P800 NEAR BLANKING
Use this feature if the material level is incorrectly reported to be near the
transducer face.
The
Near Blanking distance
(distance from the transducer face which is not
ultrasonically measurable) is preset to a value depending on the transducer
selected (P004).
blanking
blankingblanking
blanking transducer
transducertransducer
transducer
0.3 m (1 ft)
0.45 m (1.5 ft)
0.6 m (2 ft)
0.9 m (3 ft)
1.2 m (4 ft)
ST-25, ST-50, ST-H, XPS-10, XPS-15
XCT-8, XCT-12
XPS-30
ST-100, LR-21, XPS-40, XLS-30, XLT-30
LR-13, XLS-60, XLT-60
Extend Near Blanking to overcome measurement difficulties which cannot be
corrected by transducer location, mounting, or aiming.
The causes of measurement difficulties which may be corrected include:
• a vessel obstruction partly blocking the transducer acoustic beam.
• a transducer standpipe mount that is too narrow for its length.
• a transducer mounting which is resonant at the transducer frequency.
Extend Near Blanking to 150 mm (6 in) beyond the incorrect distance measured.
Ensure the Near Blanking distance is less than Empty (P006) - Span (P007).
Ensure the Near Blanking distance is less than Empty (P006) - Span (P007). Ensure the Near Blanking distance is less than Empty (P006) - Span (P007).
Ensure the Near Blanking distance is less than Empty (P006) - Span (P007).
To reset the automatic Near Blanking value
Press .
values: 0.000 to 9999
P801 RANGE EXTENSION
Use this feature if an incorrect level is reported (when material level is lower
than Empty, P006).
Range Extension is the distance in Units (P005) or % of Span (P007) beyond
Empty, which is still ultrasonically measurable.
If Empty is substantially higher than the actual vessel bottom, increase Range
Extension such that Empty plus Range Extension is greater than the transducer
to vessel bottom distance.
This value is automatically preset to 20% of Span (P007).
values: 0.000 to 9999
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