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AiRanger SPL
PL-573
Tr
oubleshootin
g
If the preceding remedies have not produced satisfactory results, the false echo has
to be ignored. Extend Near Blanking (P800) to a distance (from the transducer face)
to just beyond the distance represented by the Reading. This also increases the
nearest distance the material level/object may come within the transducer face and
still be detected.
If increasing Near Blanking is unacceptable (the transducer cannot be mounted
higher) see Auxiliary Transducer (P725). Otherwise, the TVT Curve must be raised in
the area of the false echo.
Connect an oscilloscope to the SPL, ( see Enhancement Parameters Scope
Displays, P810). Adjust the TVT Start Min (P833), TVT Start Duration (P834), and
TVT Slope Min (P835) slightly.
Continue making minor TVT Curve adjustments and taking new measurements while
observing the Echo Marker position until the Echo Lock Window repeatedly locks
onto the true echo. Verify the false echo is still ignored, regardless of the vessel
material level, or empty/fill activity.
Wrong Reading
If the Reading is erratic, or jumps to some incorrect value periodically, ensure the:
1. Material (object) surface monitored, is not beyond the transducers maximum range.
2. Material is not falling in the transducer sound beam.
3. Material (P002) value matches the material monitored.
4. Measurement Response (P003) is not set too fast.
5. Transducer (P004) type entered matches the transducer used.
If the periodic incorrect value is always the same, see Fixed Reading. If the incorrect
value seems to be random, verify the material surface to transducer distance is less
than the Empty value entered plus 20%. If the material/object monitored is outside
this distance, increase Range Extension (P801) as required.
If the material monitored is a liquid, check for splashing in the vessel. Decrease
Measurement Response (P003) as required to stabilize the Reading, or install a
stilling well (contact Milltronics or your local distributor).
Access the Noise (P807) parameter. If the peak value jumps wildly, verify the
transducer cable shields are connected to the SPL shield terminals and not to ground
elsewhere.
If the SPL is mounted in close proximity to (or transducer cables run near those of)
another ultrasonic level monitor, see Level System Sync (P726).
Temporarily disable nearby SCR control drives, high voltage or current contactors. If
the condition disappears, move the SPL to another location.
Set Echo Lock (P711) to "max verification" (response to material level changes may
be slowed somewhat).
Summary of Contents for AiRanger SPL PL-573
Page 1: ...AIRANGER SPL Instruction Manual PL 573 March 2001 IRANGER SPL 33455730 Rev 1 2 ...
Page 8: ...Page 8 AiRanger SPL PL 573 Specifications ...
Page 24: ...Page 24 AiRanger SPL PL 573 Installation ...
Page 86: ...Page 86 AiRanger SPL PL 573 Enhancement Param ...
Page 102: ...Page 102 AiRanger SPL PL 573 Maintenance ...
Page 108: ...Page 108 AiRanger SPL PL 573 Troubleshooting ...