Parameter assignment
7.22 Measurement verification (P709 to P713)
SITRANS Probe LR with mA/HART
Operating Instructions, 05/2019, A5E32337711-AC
61
Use this feature to select the measurement verification process.
Values
0
Off
1
Maximum verification
2
*
Material agitator
3
Total lock
Related
parameters
P700 Maximum Fill Rate
P701 Maximum Empty Rate
P712 Echo Lock Sampling
P713 Echo Lock Window
P820 Algorithm
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.
●
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 LR 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 LR responds immediately to a new measurement,
as restricted by the Maximum Fill / Empty Rate (P700 / P701). However, measurement
reliability is affected.
7.22.3
P712 Echo lock sampling
Note
Resetting P711 returns P712 to the respective pre-set values.
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 1 or 2.
Values
Format
x:y x = the number of above echoes y = the
number of below echoes
Range
1:1 to 50:50
Related parameters
P711 Echo Lock
P711 default value
Description
P712 pre-set value
1
maximum verification
5:5
2
* material agitator
5:2