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 automatically set to minimum, when the Transducer (P004) value is entered.
Near Blanking may be extended to overcome measurement difficulties which cannot otherwise
be corrected by transducer location, mounting, or aiming modification. (e.g. partial acoustic
beam obstruction, standpipe open end detection, etc.)
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).
To reset the automatic Near Blanking value...
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
P802 SUBMERGENCE TRANSDUCER
Use this feature when the transducer connected is equipped with a submergence shield.
If the transducer is submerged, the DPL+ detects that the monitored surface is within the Near
Blanking (P800) distance, to activate failsafe operation (subject to Failsafe Parameter
programming).
values : 0 = off (preset)
1 = submergence transducer
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PL-508 62
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