Loss Of Echo (Loe) - Siemens SITRANS L Operating Instructions Manual

C.7

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.
Confidence (2.5.9.1.) (Page 107) describes the quality of an echo. Higher values represent
higher quality.
Echo threshold (2.5.7.3.) (Page 105) defines the minimum confidence value required for an
echo to be accepted as valid and evaluated.
If the LOE condition persists beyond the time limit set in LOE timer (2.3.6.) (Page 94) the LCD
displays the Service Required icon, and the text region displays the fault code S: 0 and the
text LOE.
If two faults are present at the same time, the fault code, error text, and error icon for each
fault are displayed alternately. For example, Loss of Echo and Fail-safe.
S: 0 LOE
SITRANS LR200 with PROFIBUS PA
Operating Instructions, 07/2021, A5E32337680-AF
S: 52 Fail-safe
Technical reference
C.7 Loss of Echo (LOE)
185