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METRAVON MV-RD905 is a 26 GHz radar level meter for bulk solids with a stainless-steel horn antenna. Its application ranges distinguish lump solids up to 20 m from powders up to 15 m. Select against the actual material and distance to the lowest working surface, not the 30 m liquid figure associated with this model.
Powder and lump-material duties need different range checks
The instrument measures the distance to the reflecting surface. In a silo, that surface changes shape as material enters and leaves, so a reliable reading at one pile position does not establish the whole operating cycle. Supply the vessel section, filling direction, discharge arrangement and lowest required surface position.
The published distances are application limits for assessment, not guarantees that every powder can be measured at the endpoint. Heavy dust, a weak return or a steep pile may reduce the usable distance. Where a reading is needed close to the stated limit, agree how performance will be demonstrated during filling as well as during a quiet period.
| Characteristic | MV-RD905 configuration |
|---|---|
| Frequency | 26 GHz |
| Lump solids | Up to 20 m |
| Powder | Up to 15 m |
| Horn options | 76, 96 or 121 mm |
| Associated beam angles | 12, 8 or 6 degrees, respectively |
| Standard process temperature | -40 to 130 deg C |
| High-temperature version | -40 to 230 deg C |
| Mounting | Thread or specified flange assembly |
Temperature limits depend on the seal and ordered construction. The high-temperature version is a distinct selection, not a setting that can be enabled on a standard unit. Check pressure, temperature and connection together; an adjustable flange and a flat flange do not automatically have the same pressure rating.
Match the horn to the opening and material surface
A larger horn changes both the installation envelope and the beam angle. Check that it can pass through the opening and project as required by the selected drawing. Do not hide the antenna inside a long narrow nozzle or aim through a ladder, brace or filling stream.
For sloping piles, review the intended antenna direction through both filling and discharge. An adjustable mounting arrangement can help align the instrument, but its mechanical and pressure suitability still need checking. If purge equipment is proposed for deposits, identify its supply and maintenance requirements in the quotation rather than assuming it is included.
Order the electrical version the controller can use
The available electronics include a 24 VDC two-wire 4-20 mA/HART arrangement and separately powered RS485/Modbus arrangements. A combined-output version needs its own terminal drawing. State the receiving PLC, RTU or input module and ask for a matching supply and output configuration.
Enclosure selection also matters: the ordering information distinguishes IP67 metal housings from an IP65 plastic option. Cable entries and closure details must suit the installation. Hazardous-area use requires documents for the exact assembly; neither the general model name nor a catalogue option proves that the supplied unit carries the required approval.
Questions before releasing the order
Q1. Can a 30 m-deep powder silo use the liquid range?
No. MV-RD905 lists a shorter powder application range. Review a different configuration or measurement route for that duty. The required distance is from the radar reference to the lowest surface that must be measured, which may differ from the nominal silo height.
Q2. Does every MV-RD905 have an 8-degree beam?
No. The beam angle depends on horn size. Specify the antenna diameter and compare its path with the vessel drawing. Changing the horn can affect mounting clearance as well as the region from which echoes are received.
Q3. Will accurate level readings establish material weight?
Not by themselves. An uneven pile means one surface measurement may not describe the entire volume, and bulk density can vary. Use the level signal for its agreed purpose; an inventory or mass requirement needs its own conversion method and validation.
Acceptance and enquiry information
Record the empty reference, working endpoints, local indication and host value. Compare stable known states where accessible, then observe the actual dusty filling condition. Preserve the configuration and any available echo evidence before making an adjustment.
For an MV-RD905 quotation, provide material form, required distance, nozzle dimensions, temperature, pressure and the controller interface. Include cleaning or purge needs and access for maintenance. For a larger solids application, the MV-RD903 product page provides a separate configuration to assess rather than extending this model's powder rating.
