11.6.2.3 Set the device to ignore the false echo
To adjust the time-varying threshold (TVT) to ignore the false echoes, use auto false echo
suppression. If this does not correct the problem, enable custom TVT shaper mode and manually
shape around false echoes. For more information, see:
• Near range (Page133)
• AFES wizard (Page82)
• Custom TVT shaper (Page136)
11.6.3 Wrong reading
If the reading is erratic or jumps to some incorrect value periodically, ensure:
• Surface monitored is not beyond the transmitter's programmed range or the transmitter's
maximum range
• Material is not falling into the transmitter's acoustic beam
• Material is not inside the blanking distance (parameter "Near range") of the transmitter.
• Algorithm is set incorrectly
Adjust the echo algorithm
Use SIMATIC PDM to view echo proles and to make adjustments to parameter Algorithm
(3.3.3.1) (Page133).
If multiple echoes appear on the echo prole, typical of a at material prole (especially if
the vessel top is domed), use the “True rst echo” algorithm. Also, if the true echo has jagged
peaks, use parameter "Reform echo".
Should a stable measurement still not be attainable, contact Siemens representative.
Diagnostics and troubleshooting
11.6Operation troubleshooting
SITRANS LR500 series with mA/HART
Operating Instructions, 03/2024, A5E51099898-AA 167
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