Siemens HydroRanger 200 Manual de instrucciones descargar pdf (Pagina 238)

Page 224 HydroRanger 200 – INSTRUCTION MANUAL 7ML19981FC01

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Appendix C: Troubleshooting

If an obstruction cannot be removed or avoided, adjust the Time Varying Threshold (TVT)

Curve to reduce the Echo Confidence derived from the sound reflected by the obstruction.

Use Dolphin Plus to adjust the TVT curve or use an oscilloscope and a hand programmer

to adjust the required parameters. (See Scope Displays, P810 and TVT Shaper, P832.)

Nozzle Mountings

If the transducer is mounted on or in a nozzle, grind smooth any burrs or welds on the

inside or open end (the end that opens into the vessel). If the problem persists, install a

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

If increasing Near Blanking is unacceptable then the TVT Curve must be raised in the

area of the false echo to ignore the false echo.

Use Dolphin Plus to view live sonic profiles and make adjustments to the TVT curve.

If you do not own Dolphin Plus, connect an oscilloscope and use the hand programmer to

adjust the same parameters.

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. Finally, ensure that the true material level can still be measured in

the area where the TVT was adjusted.

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Siemens HydroRanger 200 Manual de instrucciones Pagina 238