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A radar that becomes unreliable immediately after cleaning has a useful diagnostic starting point: something changed during the work. A radar fault after cleaning may involve residue, mounting position, a connection part or configuration, not necessarily damaged electronics. Compare the before-and-after arrangement before creating a new echo map.
Reconstruct the maintenance sequence
Establish whether the instrument stayed mounted, was removed with its adapter, or was dismantled under an approved service procedure. Record the cleaning method and any parts replaced. Check whether settings were reset or altered while the unit was disconnected.
Use pre-work photographs, reference dimensions and service notes. If no baseline exists, compare the current assembly with its accepted drawing. Do not assume the old reference distance remains correct merely because the model and tank tag are unchanged.
| Change to check | Possible effect |
|---|---|
| Mounting position | A shifted reference or different view of tank internals. |
| Joint components | A changed stand-off, sealing arrangement or antenna projection. |
| Antenna condition | Remaining residue, cleaning damage or a component fitted incorrectly. |
| Configuration | Lost geometry, altered output assignment or inappropriate retained suppression. |
Separate a radar fault after cleaning from a process change
The first post-cleaning batch may contain another liquid, entrained air or a different temperature. Compare observations at equivalent conditions where possible. A signal improvement after settling does not prove that a setting change corrected reassembly.
The METRAVON MV-RD12 uses a PTFE lens and a selected process-connection assembly. That does not permit arbitrary solvents, scraping tools or disassembly methods. Obtain the applicable cleaning instructions and assess suspected damage before repeating the method.
Restore the physical baseline before changing echo treatment
If the antenna position or connection differs from the approved arrangement, resolve that discrepancy first. Suppressing the new reflection may conceal the symptom while leaving the installation unsuitable. Verify the joint and instrument condition through the authorised isolation and inspection procedure; do not loosen a live process connection.
After the physical arrangement is confirmed, compare raw distance, locally calculated level and the receiving-system indication at the same known condition. If raw distance agrees with the physical reference but only the PLC value differs, check the assigned variable, units and scaling. If the reference position moved during refitting, reconcile the geometry before applying an offset. The adapter and reference-change guide shows why a mounting change must be accounted for once, not corrected independently in both the transmitter and PLC. Save the revised settings and repeat the operating condition that exposed the fault; a new constant offset cannot remove an interfering echo.
Q1. Should the old echo map always be deleted after cleaning?
No automatic rule applies. Review whether the fixed geometry and mapped targets remain valid. Preserve the earlier configuration and follow the instrument-specific procedure for any change.
Q2. Can the instrument be accepted after one stable reading?
Not if the original post-cleaning fault occurred under another relevant condition. Repeat that condition safely or record the remaining verification limit.
Summary
Use the maintenance history to narrow the fault. Provide the MV-RD12 installation photographs, changed parts and cleaning sequence before requesting a parameter adjustment or replacement.
