Measurement Difficulties; Loss Of Echo (Loe); Adjust Transducer Aiming; Increase Fail-Safe Timer Value - Siemens HydroRanger 200 HMI Operating Instructions Manual

Measurement difficulties

2.4.2. LOE Timer
If the
Value
displays. In rare cases, the HydroRanger 200 HMI may lock on to a false echo and
report a fixed or wrong reading.

Loss of Echo (LOE)

2.4.9. mA Fail-safe Value
The
confidence is below the threshold value set in
LOE occurs when:
• The echo is lost and no echo is shown above the ambient noise. See confidence
3.2.9.2. Long Confidence
(
Echo Strength
• Two echoes are too similar to differentiate (when BLF Best F-L algorithm is used).
See confidence (
3.2.9.4. Echo Strength
strength (
• No echo can be detected within the programmed range.
If 2.4.9. mA Fail-safe Value is displayed, ensure the following conditions:
• Surface monitored is within the transducer maximum range.
2. 1 .5. Transducer
•
• Transducer is located and aimed properly.
• Transducer that has no submergence shield is not submerged.

Adjust transducer aiming

See the transducer manual for range, mounting, and aiming details. For optimum
performance, adjust transducer aiming to provide the best
3.2.9.4. Echo Strength
Displaying echoes
Check for echoes remotely using SIMATIC PDM.

Increase fail-safe timer value

2.4.2. LOE Timer
Increase the
so. Try this only if LOE exists for short periods of time.

Install a transducer with a narrower beam

A consistently incorrect level reading may be due to interference echoes from the sides
of a vessel. If this occurs, try installing a longer range (narrower beam) transducer, enter
the new transducer model, and (if necessary) optimize aiming and frequency again.
Always contact Siemens service personnel before selecting a transducer to solve this
type of problem.
Page 228 HydroRanger 200 HMI – OPERATING INSTRUCTIONS
expires due to a measurement difficulty, the
displays (seen in
3.2.9.3. Short Confidence
and
).
3.2.9.2. Long Confidence
).
matches the transducer used.
for all material levels within the measurement range.
value if fail-safe operation will not be compromised by doing
2.4.9. mA Fail-safe
2.5.9. Milliamp Output
) when the echo
2.11.2.3. Long Echo Threshold
) and echo strength (
3.2.9.3. Short Confidence
and
3.2.9.2. Long Confidence
.
3.2.9.4.
) and echo
and
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