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An 80 GHz radar level meter quotation should identify a complete instrument configuration, not just a frequency and maximum range. METRAVON models differ in antenna diameter, near limit, process materials and liquid or solids duty. A useful purchase specification makes those differences visible before the order, and defines how the delivered signal will be checked on site.
What an 80 GHz radar level meter order must identify
Begin with the medium and the required measurement. A liquid tank and a powder silo may have the same height but different echo conditions, process ratings and mounting arrangements. State the maximum antenna-to-surface distance and the closest required surface position. Neither is necessarily equal to the nominal vessel height.
Do not specify a universal 3-degree beam or an 8 cm dead zone for all 80 GHz instruments. In the METRAVON range, the MV-RD14G lists a 6-degree beam, while the MV-RD15G lists 3 degrees. Their documented range options also have defined near limits. Use the selected model and range variant when locating the highest permitted level.
| Candidate configuration | Distinction that affects the order |
|---|---|
| MV-RD14G | Liquid duty; 44 mm PTFE lens; listed distance range 0.1-30 m. Review the 6-degree beam and the flange/nozzle arrangement. |
| MV-RD15G | Liquid duty; 76 mm PTFE lens; listed range options 0.1-30 m or 0.3-150 m. A long-range option does not retain the shorter option's near limit automatically. |
| MV-RD21G | High-temperature solids duty; 76 mm PTFE lens. Its listed process pressure is -0.1 to 0.3 MPa, not the higher liquid-model rating. |
| MV-RD21S | Ambient-temperature solids configuration with a 76 mm PE lens and a listed upper process temperature of 80 degrees C. Do not substitute the high-temperature model's materials or limit. |
These distinctions help reject an unsuitable quotation. They are not a complete pressure-temperature approval: verify the actual flange, seal and operating envelope in the final configuration. Keep startup, cleaning and abnormal but foreseeable process conditions in that review.
Ask for a drawing before accepting a connection code
Provide nozzle bore and height, flange standard and facing, bolt pattern, vessel internals and the direction of the filling stream. A matching nominal flange size does not establish that the antenna clears an internal reducer. A sensor can be mechanically attached yet still look directly at a nozzle edge or filling pipe.
For a hot vessel, show the insulation and the proposed housing position. Process temperature and ambient temperature around the electronics are separate conditions. Confirm that the proposed thermal arrangement leaves the required cooling and access space rather than covering the instrument's neck because the vessel itself is insulated.
For solids, add the expected pile shape and discharge pattern. Request an aiming arrangement only where the selected product supports it. The aim should follow the intended measurement location while avoiding the filling stream; a convenient mounting angle is not evidence that the measured point represents total stock.
Make electrical options unambiguous
For a two-wire 4-20 mA/HART order, specify the supply and receiving input. Account for the voltage drops of cable, barriers and other loop devices using the selected instrument's requirements. Do not assume that an input labelled 4-20 mA supplies power or that it also supports HART communication.
If the project needs RS485 and Modbus RTU, request those electronics explicitly, with the connection diagram and register map. The controller or data logger must interpret the selected measurement, units and status correctly. Avoid writing a list of every familiar protocol into the order as though they are all present on one standard unit.
Agree on fault handling as well as the normal value. Zero current can result from power or wiring faults, and an out-of-range current may be a configured diagnostic response. Neither observation alone proves damaged electronics. The commissioning procedure should compare supply, instrument status and receiver behaviour before authorising replacement.
Compare the installed cost and delivery documents
Price depends on the quoted assembly and project scope. Compare equivalent antenna, seal, connection, housing and electronics options, then list accessories separately. Include any isolator, mounting adapter, communication interface, purge utility or commissioning service that the application actually requires. No fixed price follows from the words 80 GHz.
Request the final order code, dimensional drawing, operating instructions and electrical diagram before dispatch. Where hazardous-area use is required, the approval documents must cover the exact supplied configuration and installation conditions. A general product-family statement is not enough to approve a particular hazardous location.
For replacement equipment, also obtain the parameter backup and agreed reference distances. Record which party will set the output span and verify the PLC scaling. This prevents a correctly manufactured transmitter from arriving with no clear responsibility for the installed measurement.
Use an acceptance test that resembles the process
A bench check establishes basic operation, not performance inside the customer's vessel. At commissioning, compare the local reading and receiver value with an agreed independent reference. Check low, intermediate and high operating positions where safe and practical, and include filling, discharge or agitation when these affect the measurement.
Record the antenna reference, selected range, damping and any false-echo settings. Test only with an approved procedure: do not suppress an echo merely because it is large, and do not create an unsafe level to demonstrate an alarm. The owner must agree on reference uncertainty and acceptable differences before the test starts.
Questions when comparing quotations
Q1. Should the longest available range be ordered as a precaution?
Only when the application requires that configuration. Compare its near limit, antenna, usable range on the actual medium and cost. A larger maximum range does not compensate for a blocked beam, nor does it prove that high-level measurement close to the antenna is possible.
Q2. Can a liquid-duty model be used on solids if the range is sufficient?
Do not approve that substitution on range alone. Solid surfaces, dust, mounting and process limits need their own review. Compare the proposed liquid model with a specified solids model and obtain confirmation for the intended material and operating conditions.
Q3. Is a site echo curve required before a first purchase?
An existing instrument's curve is useful when diagnosing a replacement, but a new vessel may have none. In that case provide geometry and process information, identify uncertain conditions and agree on the commissioning assessment. A curve from another customer's tank is not proof of your installation's performance.
Summary
Approve the configuration, documents and test method together. For an 80 GHz radar quotation, send the vessel drawing, medium, operating extremes, required distances and receiving-system details. Ask METRAVON to identify the selected model and options explicitly so that purchasing, installation and commissioning work from the same specification.
