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A tank can keep the same tag number while changing to a different solvent, cleaning recipe or operating pressure. The radar may continue reporting a believable level even though its seals or connection no longer suit the service. A radar suitability review is needed when the process changes, not only when the instrument is replaced.
Compare the revised duty with the original approval
Retrieve the actual ordered construction, not just the current catalogue page. Identify process-facing materials, connection details, temperature and pressure conditions, and the measurement behaviour previously demonstrated. If that record is incomplete, the gap is part of the review rather than evidence that any new service is acceptable.
| Process change | Reason for reassessment |
|---|---|
| New liquid | Chemical compatibility and reflecting behaviour may differ from the previous contents. |
| New cleaning cycle | Temperature, pressure, concentration or exposure time may exceed the previous conditions. |
| Faster filling | Surface disturbance and the required measurement response can change. |
| Modified tank | New internals, nozzle changes or a different agitator may alter the radar path. |
A radar suitability review covers the complete assembly
The METRAVON MV-RD12 has a PTFE lens, but the lens material alone does not establish compatibility of the seal, process connection and other exposed components. Submit the liquid composition and cleaning conditions together. Do not use the maximum temperature of one construction with the pressure rating of another.
Some changes can be accepted through a documented review; others require testing or a different instrument configuration. A hotter service may lead to assessment of another product, but its own connection and material limits must be checked. A family resemblance does not establish a shared approval.
Decide which evidence needs repeating
If only the liquid changes, review chemical suitability and the radar response under the new surface conditions. If filling rate changes, examine response and stopping requirements. If a nozzle is modified, inspect the new geometry and potential reflections. Repeat the checks affected by the change instead of merely reproducing an old commissioning signature.
Also review any conversion from level to volume or mass. Changing product density can invalidate a mass estimate without changing the measured level. A modified tank or displaced internal volume can require a new geometry calculation even when the transmitter itself is untouched.
Q1. Does an unchanged display prove the new liquid is compatible?
No. Measurement response and material compatibility are different questions. Damage to a seal or exposed component may not produce an immediate reading error.
Q2. Is changing a software recipe enough to approve the instrument?
Only if the change remains within an already reviewed and documented operating envelope. Software settings cannot extend a physical pressure, temperature or chemical limit.
Summary
Treat a process change as a reason to revisit the original instrument decision. Submit the installed MV-RD12 configuration and a before-and-after process specification to identify what needs reconfirmation.
