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Some tanks cannot be filled to the highest design level during commissioning. Radar blocking distance verification must then distinguish what has been measured from what has only been reviewed or simulated. Filling closer to an overflow point just to complete a test sheet is not an acceptable solution.
Put the upper elevations on one section drawing
Locate the radar reference plane, normal maximum liquid level, alarm elevations and process limit using a common datum. Include adapters and the final antenna position. The shortest sensor-to-surface distance must be established from the installed arrangement rather than the nominal tank height.
Compare that distance with the permitted near range of the selected construction and its configuration. A catalogue lower range value is not a substitute for assessing nozzle reflections, surface motion and the project's required margin.
Separate evidence in radar blocking distance verification
| Evidence | What it can establish |
|---|---|
| As-built survey | Physical distance between the measurement origin and required upper elevations. |
| Observed level | Actual target tracking at the recorded process condition. |
| Output simulation | Receiving scale and alarm behaviour for the injected value, not the liquid echo. |
| Supplier assessment | Documented applicability and restrictions for the proposed installation. |
Record the highest real level reached and how it was referenced. Where the remaining interval is important to operation, identify the additional evidence or later trial needed. Conditional acceptance should name that open item rather than describe the entire range as tested.
Keep an installation problem out of the settings menu
Although the MV-RD12 liquid radar lists a 0.1-30 m interval, its lower endpoint is not permission to reduce a blocking setting around an unsuitable nozzle. METRAVON should review the actual near-field geometry where the required upper liquid surface approaches the antenna.
Similarly, increasing a blocking distance to hide a nozzle echo can exclude a required high-level region. Identify the reflection and resolve the conflict between usable measurement and required process range before accepting the settings.
Q1. Does simulating the high alarm prove the high-level measurement?
No. It proves the parts of the signal path included in the simulation. The actual surface, antenna and echo selection may all have been bypassed.
Q2. Should the high-level alarm be moved down to obtain a pass?
Alarm elevations are process-design decisions. Any change needs the responsible team's assessment of capacity, response and protection; it must not be an undocumented workaround for a failed instrument test.
Summary
Show the tested limit and the unverified interval clearly. Send the upper-level section and commissioning evidence for an MV-RD12 near-range assessment.
