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Solvent tank level measurement can fail even when the radar fits the nozzle and covers the tank height. A weak liquid reflection may compete with the nozzle or internal fittings, especially at low level. Qualify the actual solvent, antenna and installation together rather than treating the maximum range as evidence of performance.
Define the weakest expected liquid return
Identify the solvent or blend, concentration changes, contamination and operating temperature. Provide dielectric information where it is available, but do not invent a value from the trade name. A successful test with water does not demonstrate performance on a less reflective solvent.
The METRAVON MV-RD12 offers a 32 mm PTFE lens, nominal 8-degree beam and a published 0.1-30 m liquid measuring interval. Treat it as a candidate requiring application review, not a confirmed choice for every low-dielectric liquid. Supply the longest actual distance and the solvent condition expected there.
Keep solvent tank level measurement clear of the nozzle
A narrow or recessed mounting arrangement can produce a strong nearby reflection. Record the internal bore, reducers, nozzle length and reference plane. Review the beam at the bottom of the working range, where more of the tank structure may be illuminated. Do not approve a retrofit from the flange bolt pattern alone.
| Case | Test focus | Result to retain |
|---|---|---|
| Low level | Weak surface return versus tank internals | Known reference distance and the corresponding echo. |
| Refill | Inlet stream and rising surface | Valid level trend through the required filling interval. |
| Thermal change | Condensation near the antenna | Observed signal condition before and after the transition. |
| Grade change | Different solvent composition | Evidence that the approved operating range still applies. |
Specify the pressure seal and electrical protection separately
Blanketing pressure, vacuum and temperature belong in the mechanical review. Confirm the allowable combination for the selected process connection and seal. Nitrogen blanketing does not, by itself, resolve condensation, chemical compatibility or the site's electrical-area requirements.
For flammable service, have the responsible engineer verify the offered certificate, protection concept, temperature class and permitted installation accessories against the site classification. Neither the PTFE lens nor an IP rating establishes hazardous-area suitability. Do not loosen a process connection for a reading check while the tank is in service.
What the inventory display can claim
Radar distance becomes volume only through a tank conversion referenced to the same datum. Mass requires suitable density information and any necessary temperature treatment. This process-level proposal does not establish custody-transfer performance. Keep the indication and any independent overfill function separately specified and tested.
Q1. Can a false-echo map solve a weak liquid signal?
It may help reject identified fixed reflections, but it cannot create a missing surface return. Mapping must use a known liquid position so the real target is not suppressed. If the usable return remains inadequate, review the antenna and mounting arrangement before accepting the instrument.
Q2. Does a stable displayed value prove the liquid is being tracked?
Not necessarily. It could be a fixed obstruction or a retained value after signal loss. Compare raw distance and status while the liquid changes under a controlled operating sequence.
Summary
Request a solvent-tank radar assessment with composition, pressure-temperature cases, nozzle drawing and required hazardous-area documentation. Acceptance should demonstrate tracking of the actual solvent across the working range, not merely successful power-up.
