Parameter assignment
7.25 Echo processing (P800 to P807)
SITRANS Probe LR with mA/HART
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Operating Instructions, 05/2019, A5E32337711-AC
7.25.1
P800 Near blanking
Defines the distance from the reference point to be ignored by the transmitter/receiver.
Values
Range
0.00 to 20 (m: selected in P005)
Default
0.30 m (plus the shield length)
Related parameters
P006 Empty
P007 Span
P838 Auto False-Echo Suppression Distance
To extend the blanking beyond the minimum default, enter a value in units.
7.25.2
P801 Range extension
Note
Maximum range extension depends on the setting for P006 (Empty).
Allows the material level to drop below Empty (process empty level), without generating an
LOE state.
Values
Range
0 to 1000%
Default
5.000 (% of Span)
Related parameters
P006 Empty
P007 Span
Use this feature if the surface monitored can drop below Empty level (P006) in normal
operation. The value for P801 is added to Empty, and the sum can be greater than the range
of the antenna. Range Extension can be increased (in Units or percent of Span) to a point
where Empty plus Range Extension is greater than the distance from the flange face to the
furthest surface to be monitored. The distance below empty is not blanked.
●
Enter the value as a percentage of P006.
●
For vessels with conical or parabolic bottoms, increase the value for P801 to ensure that
an empty vessel reads Empty.
7.25.3
P804 Confidence threshold
Determines which echoes are evaluated by software.
Values
Range
0 to 99
Default
5
Related parameters
P070 Failsafe timer
P804 sets the minimum echo confidence that the echo must meet in order to prevent a Loss
of Echo condition and the expiration of the Failsafe timer (P070). When Echo Confidence
(P805) exceeds the Confidence Threshold, the echo is evaluated.