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METRAVON MV-RD703 uses a dual-cable guided wave radar probe for level measurement. The two parallel conductors guide the pulse along the probe, making this structure a candidate for low-dielectric liquids and separately assessed powder applications. State whether the required result is the upper liquid level, an interface between liquids or a powder surface: these are different measurement duties.
Define the measured boundary: surface or interface
An oil-water interface request must describe both liquids, their dielectric properties, the upper-layer thickness and whether an emulsion forms. The pulse must provide a usable return from the intended boundary. A visible separation in a sample bottle does not establish that the installed instrument can track that interface throughout the vessel's operating cycle.
Specify which value the control system needs and which variables are available from the selected electronics. Do not assume one 4-20 mA loop reports two independent levels. If the upper surface and interface are both required, have the signal arrangement and accessible variables confirmed before selecting the PLC inputs.
Dual-cable guided wave radar selection data
| Item | Liquid-duty selection |
|---|---|
| Listed distance range | 0.3-20 m; confirm the usable span for the selected probe and liquid. |
| Probe construction | 6 mm dual cable, 304 / 316L |
| Process connection | Flange, DN100 or larger in the liquid-duty listing; confirm the complete mounting drawing. |
| Process temperature | -40 to 120 deg C |
| Process pressure | -0.1 to 2.5 MPa |
| Two-wire signal | 24 VDC, 4-20 mA/HART |
These liquid-duty limits do not approve a powder installation or every interface application. For solids, submit the bulk density, filling trajectory, discharge pattern and probe loading for a separate selection. Do not transfer a longer powder-probe option into a liquid-level order without confirming the assembly and measuring range.
Prevent contact and buildup between the cables
Keep the two conductors in the arrangement specified by the probe drawing. Route neither cable across an agitator, internal pipe or filling jet. Account for sideways movement rather than checking only the empty vessel. Sticky material that bridges the conductors changes the measurement conditions and may make this structure a poor choice.
For a short, clean-liquid vessel with limited space around the probe, the MV-RD704 coaxial arrangement is another option to assess. It has its own length and cleaning limits and is not a drop-in replacement for a long dual-cable assembly.
Prove the required measurement before handover
Test upper-surface measurement against known levels during filling and emptying. For interface service, compare the reported boundary with an independent measurement method suitable for the vessel. Include changes in upper-layer thickness and any emulsion state expected in operation. Agree what the PLC should do if the intended echo is lost; a steady display alone is not proof of the correct boundary.
Q1. Can the same model be used for fly ash and oil-water separation?
The model family appears in both application types, but the order configuration cannot be assumed identical. Powder service introduces mechanical pull and buildup; interface service depends on two liquids and their echo behaviour. Each needs its own probe, range and acceptance review.
Q2. Is RS485 interchangeable with the HART loop?
No. Request the RS485/Modbus option explicitly and obtain its terminal allocation, supply requirement and register map. The receiving system must read the intended measured variable with the correct units; changing the cable alone does not convert a HART output into Modbus.
To request an MV-RD703 configuration, provide the measurement duty, media, vessel and nozzle drawing, operating limits, required span and receiver details. For an interface project, add the two-layer conditions before requesting a price.
