Siemens HydroRanger 200 Manual de Instruções descarregar pdf (Página 239)

7ML19981FC01 HydroRanger 200 – INSTRUCTION MANUAL Page 225

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Appendix C: Troubleshooting

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 the Parameter Reference for details.

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

adjust the same parameter.

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).

If multiple echoes appear on the Echo Profile, typical of a flat material profile (especially if

the vessel top is domed), use the “first” Algorithm.

If the Echo Profile repeatedly switches from short to long, adjust the Short Shot Range

(P852) to stabilize the “shot” mode used for the echo evaluation. Also, adjust the Short

Shot Bias to increase (or decrease the amount of preference given to short shot echoes

over long shot echoes.

Should a stable measurement still not be attainable, contact Milltronics or your local

distributor.

Transducer Ringing

If the transducer is mounted too tightly, or if it is mounted so that its side touches

something, its resonance characteristics change and this can cause problems.

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Siemens HydroRanger 200 Manual de Instruções Página 239