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An "empty" tank may still contain a liquid heel, deposits or product in a sump. Empty-tank radar echo mapping should start by establishing what is physically below the antenna. Otherwise a technician may record a real liquid surface as unwanted background or confuse a sloping floor with the configured zero.
Locate the bottom where the beam actually points
A vessel drawing may show the lowest drain point, while the radar looks at a higher part of a dished or sloped bottom. Use a section through the antenna position and identify the reflecting surface along that path. Tank zero, lowest physical point and antenna-to-bottom distance need not be identical.
Confirm the tank state through approved operating records and safe reference methods. Do not enter a vessel or open a process connection merely to obtain a mapping reference. Where the remaining liquid cannot be established, record that uncertainty and do not treat the capture as a verified empty-tank baseline.
| Bottom condition | Mapping implication |
|---|---|
| Sloped floor | The echo distance at the beam location can differ from the lowest tank point. |
| Liquid heel | The observed surface may be product rather than the vessel floor. |
| Deposits | The baseline may change after cleaning or further accumulation. |
| Unknown condition | The trace can be retained for investigation but not labelled as a confirmed empty reference. |
Empty-tank radar echo mapping is a controlled configuration task
For METRAVON MV-RD12, confirm which diagnostic and suppression functions are supported by the installed electronics. A communication interface alone does not define the available service tool or mapping procedure. Follow the applicable instructions and retain the pre-change settings.
Do not extend suppression to a convenient distance beyond an unknown surface. The real target may subsequently move through the recorded region. Identify the purpose and extent of any approved mapping and preserve the geometry and process condition that justified it.
Verify the first usable product levels after mapping
A satisfactory empty indication does not establish how the radar will acquire a shallow liquid layer or track it as the tank fills. Under an authorised operating test, compare the indicated distance with suitable known conditions near the bottom and farther into the working span.
Record what the instrument reports below the lowest validated operating level. A minimum useful level may be above the physical drain point. Define how that affects pump control or inventory reporting instead of forcing a precise-looking zero from an unqualified surface.
Q1. Can the tank drawing alone prove that the vessel was empty?
No. It describes geometry, not the contents at the time of capture. Keep an operating-state record with the trace.
Q2. Should a previous empty map always be restored after cleaning?
Compare the pre-cleaning record with the current antenna position, deposits and known residual contents. The post-cleaning fault checks help separate a changed installation from a configuration problem. Reuse the old map only when its recorded geometry and conditions still apply; follow the installed unit's procedure for any update.
Summary
Establish the actual bottom target before changing echo suppression. Provide the MV-RD12 location, bottom section and known residual contents to plan a defensible low-level check.
