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A hazardous-area radar retrofit can change more than the electronics. An adapter, replacement flange or different process seal may alter the assembly that was originally reviewed. Before reuse, identify exactly what will change and obtain a documented assessment of the proposed configuration. Keeping the old nameplate does not resolve a change in construction.
Separate the process joint from the explosion-protection evidence
The process connection must suit the pressure, temperature, fluid and mechanical installation. Explosion-protection suitability has its own equipment identity, marking, certificate scope and installation requirements. Passing one review does not automatically satisfy the other, and neither should be inferred from a flange that happens to bolt into place.
For certified equipment, send proposed design changes to the manufacturer or responsible certification contact for assessment. A user should not decide independently that an altered assembly is still covered merely because its electronics are unchanged. Conversely, do not declare every seal replacement a new design: an authorised like-for-like service replacement and an unapproved substitution are different cases.
Record the hazardous-area radar retrofit as an assembly change
| Change | Evidence to obtain before approval |
|---|---|
| Flange | Original and proposed drawings, material, connection rating and documented compatibility. |
| Seal | Exact replacement specification, service suitability and authorised assembly procedure. |
| Adapter | Complete arrangement, load and process implications, and effect on the measurement reference. |
| Certificate scope | Identification of the supplied variant and written resolution of changes that may affect coverage. |
Do not turn a catalogue option into an approval
The METRAVON MV-RD12 listing describes connection and construction options for liquid-level duty. The standard listing alone is not evidence that a requested hazardous-area assembly is approved. Keep the exact certificate and configuration review as a purchasing hold point where the site requires it.
Provide the site's classification and installation requirements with the enquiry. A general request for an "explosion-proof radar" leaves the intended protection concept and operating conditions unresolved. Do not substitute an ordinary enclosure protection rating for hazardous-area evidence.
After the approved mechanical work
Follow the authorised installation and inspection procedures before returning the equipment to service. If an adapter changes the reference position or nozzle geometry, recheck level conversion and echo behaviour as well. Those measurement checks do not replace the process-integrity or hazardous-area release.
Q1. Can an unused flange from another transmitter be fitted?
Only after compatibility and approval for the intended assembly are established. Matching nominal size is not sufficient evidence of material, pressure, sealing or certified-construction equivalence.
Q2. Who should decide whether a certificate needs updating?
Use the manufacturer and the responsible certification route for the equipment. Keep their written determination with the change record; a procurement description or this article cannot make that decision.
Summary
Approve the complete changed assembly before reuse. Submit the existing identification, proposed connection drawing and site requirements; leave unsupported approval claims out of the order until resolved.
