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80 GHz vs 26 GHz radar selection is useful only when the comparison concerns instruments for the same duty. For bulk solids, METRAVON MV-RD21 and MV-RD903 provide a concrete comparison of antennas, range configurations and mounting requirements. Neither frequency alone establishes suitability for every silo.
80 GHz vs 26 GHz Radar: Compare the Offered Antennas
| Item | MV-RD21 | MV-RD903 |
|---|---|---|
| Frequency | 80 GHz; bulk-solids service. | 26 GHz; bulk-solids service. |
| Antenna | 76 mm PTFE lens; listed 3-degree beam. | 96 mm horn with 8-degree beam, or 121 mm horn with 6-degree beam. |
| Range | 0.1-30 m or 0.3-150 m configurations. | Listed 0.6-70 m interval. |
| Connection | DN80 or larger flange reference; confirm the offered assembly. | DN100 or larger flange reference; check horn passage and orientation. |
These are published model references, not guaranteed operating distances for all materials. Review the lowest and highest surface, dust, moisture, deposits and installation before accepting a range. Specify the exact antenna option so the beam calculation corresponds to the quoted hardware.
When the Narrower Path Solves a Real Problem
MV-RD21 may offer a useful geometry change when an existing measurement path intersects roof steelwork or a filling stream. Plot its footprint through the required distance and determine which part of the pile it observes. Avoid replacing one obstruction problem with an unrepresentative local peak.
A smaller nominal flange reference does not approve an existing nozzle. Check lens position, bore, length and support. Compare the actual installed reference plane so a change of instrument does not silently shift the level datum.
When an Existing 26 GHz Arrangement Remains Useful
If the MV-RD903 horn fits the roof opening, its beam is clear and representative operating evidence supports the duty, changing frequency needs a defined benefit. Review spares, supported electronics and the current process rather than treating an established installation as unsuitable merely because another frequency is available.
The horn must clear the mounting passage and retain its approved orientation after maintenance. Its listed 6- or 8-degree beam is a property of the selected horn, not one universal value for all 26 GHz products.
Compare the Installed Result, Not Just Nominal Accuracy
The listed reference distance accuracies are +/-5 mm for MV-RD21 and +/-15 mm for MV-RD903. They do not establish the uncertainty of tonnes calculated from an uneven pile. Agree what improvement matters: target availability during filling, usable range, obstacle clearance or maintainability.
Obtain the configuration-specific temperature, pressure, output and approval documents for either model. No frequency comparison establishes hazardous-area suitability or electrical interchangeability. Before replacing an operating unit, preserve its diagnostic baseline and compare the new arrangement under equivalent process conditions.
Frequency-Selection Questions
Q1. Does 80 GHz eliminate dust and coating effects?
No. Evaluate the actual material and antenna condition, including the delivery event. A narrow footprint is not evidence of immunity to every deposit or dust concentration.
Q2. Can the old parameters be copied after switching models?
Use them as a record of the previous installation, not an automatically valid configuration. Recheck reference plane, near limit, output variable and echo processing for the supplied replacement.
Summary
Choose the model that addresses the silo's demonstrated measurement constraint. Request an MV-RD21 and MV-RD903 comparison with the current echo record and roof drawing, identifying the operational improvement required.
