Siemens sitrans PROBE LU Instruction Manual page 57

If a material agitator or mixer is used in the monitored vessel, set Echo Lock for Maximum
Verification or Material Agitator, to avoid agitator blade detection.
Note:
Ensure the agitator is always running while SITRANS Probe LU is monitoring the
vessel, to avoid stationary blade detection.
• When Maximum Verification or Material Agitator is selected, a new measurement
outside the Echo Lock Window (P713) must meet the sampling criterion (P712).
• When Total Lock is selected, Echo Lock Window (P713) is pre-set to 0.
SITRANS Probe LU continuously searches for the best echo according to the algorithm
chosen (P820). If the selected echo is within the window, the window is then centered
about the echo. If not, the window widens with each successive shot until the selected
echo is within the window. The window then returns to its normal width.
When Echo Lock is Off, SITRANS Probe LU responds immediately to a new measurement,
as restricted by the Maximum Fill / Empty Rate (P700 / P701). However, measurement
reliability is affected.
P712 Echo Lock Sampling
The sampling criterion sets the number of consecutive echoes that must appear above or
below the echo currently locked onto, before the measurements are validated as the new
reading. (Echo Lock P711 must be set to
Values
Related
P711 default value
1
2
Example:
• Set P711 to 2 (material agitator)
• The preset values for P712 in this case are 5:2
• Result: a new reading will not be validated unless 5 consecutive measurements
higher or 2 consecutive measurements lower than the current reading occur.
Note:
Resetting P711 returns P712 to the respective pre-set values.
7ML19985HT01
1
Range
Format:
P711 Echo Lock
Description
maximum verification
* material agitator
SITRANS Probe LU – INSTRUCTION MANUAL
or .)
2
1:1 to 50:50
x:y
x = the number of above echoes
y = the number of below echoes
P712 pre-set value
5: 5
5: 2
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