Siemens HydroRanger 200, Инструкция по эксплуатации

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Page 236 HydroRanger 200 – INSTRUCTION MANUAL 7ML19985FC03
mmmm
m
App
e
ndix C:
Tr
oubleshoot
ing
larger diameter or shorter length nozzle, bevel the inside of the bottom end, or cut the
open end of the nozzle at a 45° angle.
See the transducer manual for complete mounting instructions.
For ST-series and XPS-10 transducers use the plastic conduit / flange adapter supplied
with the unit.
If the mounting hardware is over tightened, loosen it. Over tightening changes the
resonance characteristics of the transducer and can cause problems.
Set the HydroRanger 200 to Ignore the Bad Echo
If the preceding remedies have not fixed the problem, the false echo has to be ignored.
If the Echo is Close to the Transducer
If there is a static, incorrect, high level reading from the HydroRanger 200 there is
probably something reflecting a strong echo back to the transducer. If the material level
never reaches that point extend the Near Blanking (P800) to a distance to just past the
obstruction.
Adjust the TVT to Ignore the Echo
Use Auto False Echo Suppression (P837-P839) to automatically shape around false
echoes.
Wrong Reading
If the Reading is erratic, or jumps to some incorrect value periodically, ensure the:
1. Surface monitored is not beyond the HydroRanger 200’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 of the transducer.
Types of Wrong Readings
If a periodic wrong Reading is always the same value, see
Fixed Reading
.
If the wrong Reading is random, ensure 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. This error is 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
Maximum Process Speed (P003) value to stabilize the Reading, or install a stilling well.
(Contact Siemens Milltronics or your local distributor.)
Adjust the Echo Algorithm
Use Dolphin Plus to view live sonic profiles and make adjustments to the P820 Algorithm
parameter. See P820 on page 204 for details.
If the “Area” algorithm is used and narrow noise spikes are evident on the (long shot)
Echo Profile, turn the Spike Filter (P821) on and/or widen the Narrow Echo Filter (P822).
Also, if the true echo has jagged peaks, use Reform Echo (P823).