ECHO PROCESSING PARAMETERS (P800 to P807)
P800 NEAR BLANKING
Use this feature if the surface monitored is incorrectly reported to
be near the transducer face.
Near Blanking
(the distance from the transducer face which is not
ultrasonically measurable) is preset to a value depending on the
transducer selected (P004).
blanking
transducer
0.3 m (1.0 ft) ST-25, ST-50, ST-H, XPS-10, XPS-15
0.45 m (1.5 ft) XCT-8, XCT-12
Extend Near Blanking to overcome measurement difficulties which cannot
be corrected by transducer relocation, 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 150 mm (6 in) beyond the incorrect distance reported.
Do not reduce Near Blanking to less than the preset value.
Ensure Near Blanking is less than Empty (P006) - Span (P007).
values: 0.000 to 9999
P801 RANGE EXTENSION
Use this feature if the surface monitored is incorrectly reported when the
material level is lower than Empty (P006).
Range Extension
(the distance beyond Empty which is still ultrasonically
measurable) is preset to 20% of Span (P007).
Ensure the % Symbol is displayed before attempting to enter a % of Span
value. (See Keypad).
If the surface monitored can extend beyond Empty (P006), increase Range
Extension (in Units (P005) or % of Span) such that Empty plus Range
Extension is greater than the transducer face to furthest surface to be
monitored distance.
values: 0.000 to 9999
PROGRAMMING
PARAMETERS
PL-507 133
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