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A silo radar may display a plausible level once the dust settles yet become unavailable during every delivery. Dusty silo radar commissioning must establish when a usable measurement returns, not just whether the final number looks reasonable. That distinction matters when another delivery can start before the previous disturbance has cleared.
Follow one delivery from start to recovery
Record the start and stop of conveying alongside the raw distance, reported level and available validity indications. Note changes in conveying rate and extraction equipment. Keep the sampling interval and any transmitter or PLC filtering with the record: a slow trend can conceal a short but operationally important loss of measurement.
After filling stops, observe whether the reading recovers promptly, remains fixed, or moves to a different distance. Compare it with an independent indication taken at a defined location where this can be obtained safely. A radar looking at the material peak and a reference near the wall do not observe the same surface.
| Observed pattern | What to investigate |
|---|---|
| Filling only | Beam intersection with the delivery stream, airborne material and changes in the forming surface. |
| Delayed recovery | Residual dust, configured filtering and whether the receiver is holding an old value. |
| Persistent error | Deposits, a stationary reflector or a changed surface profile; inspect only under the authorised access procedure. |
| Different by grade | Moisture, particle characteristics and filling behaviour of each material actually handled. |
Define acceptance for dusty silo radar commissioning
Agree the longest interruption the operating duty can tolerate and how an unavailable measurement is displayed. A purchasing specification that requires continuous control during filling cannot be satisfied by demonstrating recovery after filling. Conversely, a post-delivery inventory check may tolerate a documented settling period, provided the instrument is not also relied on for an unverified protective duty.
When assessing METRAVON MV-RD21, use its nominal 3-degree beam to plot the path against the inlet, roof structure and changing material profile. Its 76 mm PTFE lens still needs an installation that accounts for deposits and the filling stream. Ask for aiming hardware only after that path has been reviewed.
Separate process recovery from signal smoothing
Compare the local measurement with the value delivered to the control system. If the local distance has recovered but the PLC remains unchanged, investigate communication, scaling and hold logic before moving the antenna. If both respond slowly, review the configured response together with the process trend. Change one setting at a time and retain the earlier trace.
Q1. Should commissioning use the cleanest available material?
Use material representative of the intended duty, including the grade or delivery condition expected to be most difficult. A clean trial can establish wiring and basic response but leaves dusty operation unqualified.
Q2. Is a fixed recovery-time limit suitable for every silo?
No. The limit comes from the operating sequence and required response, not a generic radar rule. Record the observed recovery separately from the permitted interruption.
Summary
A useful commissioning record shows what happens during delivery and how measurement resumes afterward. Share the filling timeline, silo drawing and MV-RD21 trend to identify whether the next action concerns mounting, settings or operating requirements.
