User's Manual

Page 83 SITRANS LR 460 – INSTRUCTION MANUAL 7ML19985JM01
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F: Technical Reference
Echo Lock
When the echoes are received, the relevant echo algorithm is applied to determine the
true material echo. If the selected echo is within the window, the window is then
centered about the echo. Otherwise the window widens with each successive shot until
the selected echo is within the window, which then returns to its normal width.
Echo Lock selects the measurement verification process:
• When Echo Lock is Off, SITRANS LR 460 responds immediately to a new
measurement (within the restrictions set by the Maximum Fill / Empty Rate).
However, measurement reliability is affected.
• When Maximum Verification or Material Agitator is selected, a new measurement
outside the Echo Lock Window must meet the sampling criteria.
• When Total Lock is selected, Echo Lock Window is pre-set to 0, and the window is
automatically calculated after each measurement.
Loss of Echo (LOE)
A loss of echo (LOE) occurs when the calculated measurement is judged to be unreliable
because the echo confidence value has dropped below the echo confidence threshold.
The LOE timer starts running, and if the LOE condition persists beyond ten minutes (the
time limit set by the LOE timer) the Unreliable Echo indicator replaces the Reliable Echo
indicator.
Reliable Echo indicator Unreliable Echo indicator .
While LOE is pending the x flashes, alternating with the two horizontal bars. When LOE
becomes active, the x becomes solid and the auxiliary display shows fault code S: 0.
Upon receiving a reliable echo, the loss of echo condition is aborted, the Reliable Echo
indicator reappears, and the reading returns to the current level.
Values
0
Off
1
Maximum Verification
2*
Material Agitator
3
Tot al L ock