Siemens SITRANS LR250 Instruction Manual page 76

2.2.4.2. Sampling
2.2.4.2.1. Echo Lock
Selects the measurement verification process.
If a material agitator or mixer is used in the monitored vessel, Echo Lock
should be set for Maximum Verification or Material Agitator to avoid
agitator blade detection.
2.2.4.2.4. Sampling up
Once echo is outside the window, a specified number of consecutive
echoes must appear above the echo locked onto, before measurement is
accepted as valid.
2.2.4.2.5. Sampling down
Once echo is outside the window, a specified number of consecutive
echoes must appear below the echo locked onto, before measurement is
accepted as valid.
2.2.4.2.6. Window
A "distance window" centered on the echo, used to derive the reading.
When a new measurement is in the window, the window is re-centered
and the reading is calculated (see Display before Auto False Echo
Suppression, page 75 for an illustration).
When the value is 0, the window is automatically calculated after each
measurement.
• For slower Measurement Response values, the window is narrow.
• For faster Measurement Response values, the window becomes
1.
This parameter is for use only by Siemens Milltronics service technicians.
Page 72 SITRANS LR250 (HART) – INSTRUCTION MANUAL
Ensure the agitator is always running while SITRANS LR250 is
Note:
monitoring the vessel, to avoid stationary blade detection.
Lock Off
Maximum Verification
Options
*
Material Agitator
Total Lock
Fill Rate
Empty Rate
Echo Lock Sampling
Related
Echo Lock Window
parameters
Algorithm
1
1
progressively wider.
The echo lock window is stored as standard sample, but
Note:
displayed sensor units. Any value entered for the echo lock window will
be rounded to the nearest sample.
1
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