Master mechanic Security+ 642-2MM Manuel d'instructions télécharger pdf (Page 246)

Page 236 MultiRanger 100/200 – INSTRUCTION MANUAL 7ML19981FB06

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Appendix C: Troubleshooting

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 MultiRanger 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 MultiRanger 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 MultiRanger’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).

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Master mechanic Security+ 642-2MM Manuel d'instructions Page 246