Wrong Reading - Siemens HydroRanger 200 HMI Operating Instructions Manual

Wrong reading

If the reading is erratic, or jumps to some incorrect value periodically, ensure the
following conditions:
1. Surface monitored is not beyond the HydroRanger 200 HMI's programmed range or
the transducer's maximum range.
2. Material is not falling into the transducer's acoustic beam.
3. Material is not inside the blanking distance (
Types of wrong readings
If a periodic wrong reading always produces the same value, see
.
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If the wrong reading is random, ensure the distance from the transducer to the material
surface is less than the
are still within the measurement range programmed in the device). If the material/object
monitored is outside this range, increase
most common in OCM applications using weirs.
Liquid splashing
If the material monitored is a liquid, check for splashing in the vessel. Enter a lower
response rate value (see
install a stilling well. Contact your Siemens representative for assistance.
Adjust the Echo Algorithm
Use SIMATIC PDM to view echo profiles and make adjustments to the Algorithm
2.11.2.2. Algorithm
parameter. See
If narrow noise spikes are evident on the Echo Profile, widen the
Filter
. Also, if the true echo has jagged peaks, use
If multiple echoes appear on the Echo Profile, typical of a flat material profile (especially if
the vessel top is domed), use the "TF " (True First) algorithm.
Should a stable measurement is still not attainable, contact your Siemens representative.
Transducer ringing
If the transducer is mounted too tightly, or if it is mounted so that its side touches
something (such as a vessel wall, or standpipe), its resonance characteristics change
and this can cause problems. Hand tighten only. Using PTFE tape is not recommended as
it reduces friction, resulting in a tighter connection that can lead to ringing.
Page 230 HydroRanger 200 HMI – OPERATING INSTRUCTIONS
2.2.7. Range Extension
2.2.7. Range Extension
2.3.4. Response Rate
on page 160 for details.
2.2.6. Blanking
) of the transducer.
Fixed reading
value plus one meter (that is, ensure you
as required. This error is
on page 125) to stabilize the reading, or
2.11.2.6. Narrow Echo
2. 1 1.2.5. Reform Echo
on page
.
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