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A radar can work well during one delivery route and lose useful measurement when another inlet starts. Radar in a multi-inlet silo needs assessment against the full operating sequence. A commissioning record that says "tested during filling" is incomplete if it identifies neither the inlet nor the combinations used.
Draw each stream and the surface it creates
Show the inlet locations, directions, distributors and radar axis on the roof plan and silo section. Identify which routes can run together. A second route may place falling material in the beam or form a peak at a different location even when total filling rate is unchanged.
Record differences in conveying method, material grade and extraction operation. The route is not just a pipe label: it can change airborne dust, material impact and where deposits accumulate. Use actual operating information rather than assuming that equal flow rates produce equivalent radar conditions.
| Operating state | What the observation must address |
|---|---|
| Inlet A only | Its stream, surface profile and measurement continuity. |
| Inlet B only | Any different beam intersection, dust pattern or local peak. |
| Combined filling | The permitted simultaneous state, where it is part of normal operation. |
| Route transition | Whether tracking remains useful as one stream stops and another starts. |
Select the mounting for radar in a multi-inlet silo
The METRAVON MV-RD21 uses a nominal 3-degree beam for bulk-solids measurement. That narrow path can help separate the target from structures, but it does not make an intersecting fill stream irrelevant. Plot the path over the required distance range and review every authorised filling route.
Choose the target according to the purpose. The location that provides a useful operating-level trend may not represent average inventory when two peaks form. Moving the sensor away from one inlet can put it closer to another stream or a wall, so assess the complete geometry before requesting a bracket change.
Keep untested combinations visible
Observe representative conditions through the approved commissioning procedure. Record distance, validity information where supported and the active inlet state together. Do not run an otherwise prohibited combination solely to complete a test matrix.
If a permitted operating state cannot be tested, document the missing evidence and obtain the project's acceptance decision. An observation from one route should not silently qualify another. Revisit the assessment when an inlet is added, redirected or used for a new material.
Q1. Does post-fill recovery prove both routes are acceptable?
No. It establishes the observed recovery after that event. A duty requiring valid level during filling must be evaluated while each relevant route is active.
Q2. Can each inlet have a different calibration offset?
Do not use offsets to disguise different local material profiles. First establish what the radar observes and whether that observation suits the required decision.
Summary
Qualify the filling routes, not just the silo name. Send the inlet plan, permitted combinations and MV-RD21 trends to review the measurement location.
