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A radar retrofit adapter must satisfy the existing tank connection and the selected instrument while leaving a usable measurement path. Matching the nominal sizes is not enough. Before ordering an MV-RD12 assembly, review the mating joints, internal opening, seals, process conditions and access on one drawing.
Identify both ends of the radar retrofit adapter
Start with the existing nozzle identification and the offered instrument connection. Record the actual thread standard or flange details, sealing arrangement and installation orientation at each end. Include any valve, spacer, lining or second adapter already in the stack. A photograph of the upper flange cannot establish the opening through the complete assembly.
The METRAVON MV-RD12 is offered with threaded and flanged constructions. Its published threaded choices include G1 1/2A and 1 1/2 NPT. A similar nominal size does not make the threads or sealing methods interchangeable. Obtain the proposed assembly drawing before purchasing a fitting or modifying the tank connection.
Check the clear opening through the assembled stack
Use a section showing the finished bore, changes of diameter, recess depth and antenna position. Account for gasket projection, internal welds, valve components and other features that reduce the opening. Record measured dimensions separately from drawing dimensions and estimates.
The listed 32 mm PTFE lens dimension helps identify the MV-RD12 assembly, but it does not establish a universal minimum nozzle bore or maximum recess. Do not extend a simple beam-angle triangle back to the antenna face to approve a long passage. The selected antenna and actual nozzle geometry need a configuration-specific installation review.
| Adapter check | Evidence needed before ordering |
|---|---|
| Mating connections | Thread or flange designation, sealing faces and the drawings of both connected assemblies. |
| Internal path | Clear bore, steps, intervening components and final antenna location in a dimensioned section. |
| Process-facing parts | Adapter, seal and connection materials assessed against the liquid, vapour and cleaning exposure. |
| Operating limits | Permitted pressure-temperature conditions for the selected joint and complete process assembly. |
| Access and support | Room for installation, enclosure access and removal, with support and mechanical loading reviewed. |
Approve the joint separately from the radar reading
A stable level indication does not establish that the joint is mechanically suitable. The adapter, mating connections and seals must be assessed together for the operating pressure and temperature. A flange name or lens material cannot supply a missing assembly rating.
List the exposed parts individually. A PTFE lens does not protect an unsuitable adapter or seal from the process. Include chemical concentration and cleaning conditions, not only the normal liquid name. If the supplier qualifies the offer because a material or operating condition is unknown, keep that item open rather than treating delivery of the fitting as technical approval.
Have the responsible mechanical personnel review any added support requirement, connection loading or proposed tank modification. Use the specified installation and tightening procedures. A general selection article cannot provide a bolt torque or authorise machining a pressure-containing connection.
Include removal space and the final reference position
Show how the instrument will be fitted and later removed. An adapter may solve bolt compatibility while leaving the housing against pipework or making the connection inaccessible. Identify who supplies the approved joint parts and who verifies the completed installation; do not hide this work in an undefined accessory allowance.
Keep the measurement reference plane on the same drawing as the final antenna location. When the assembly changes that plane, update the relevant reference dimensions and verify where distance is converted to level. The separate drawing-revision review explains the effect on settings and acceptance. A software correction cannot approve an unsuitable joint or remove a physical obstruction.
Inspect what was fabricated before changing echo settings
Compare the received adapter and assembled nozzle with the accepted drawing. Confirm identity, orientation, clear opening and seal placement using the site's approved inspection and isolation procedure. The finished-nozzle inspection checks cover the difference between a nominal connection and the actual aperture.
After the mechanical arrangement is accepted, verify the installed measurement at known, safely obtainable conditions and compare it with the receiving system. Retain the final section, settings and any available diagnostic evidence. If a filling or upper-level condition cannot yet be tested, state that limitation rather than using one steady reading to approve the whole range.
Questions before releasing an adapter order
Q1. Can the adapter be approved from its two nominal connection sizes?
No. The sizes do not define sealing faces, internal steps, recess depth or the process rating. Review the completed stack and the chosen instrument drawing before accepting fit and measurement suitability.
Q2. Can an offset correct a new fixed echo after the adapter is fitted?
An offset changes the reported reference, not the physical target. First determine whether the instrument sees the liquid or an intervening feature. Use the applicable installation and echo procedure; do not adjust the display simply to reproduce the previous number.
Q3. What if an existing nozzle cannot be inspected until the shutdown?
Identify the unverified dimensions and obtain only a proposal whose assumptions are explicit. Do not release irreversible fitting or fabrication decisions that depend on those unknowns. Arrange the required inspection and a reviewed contingency for the actual connection found on site.
Summary
Order the adapter as part of an identifiable mechanical and measurement assembly. Send the old nozzle details, proposed stack section, process conditions and MV-RD12 connection choice with an adapter suitability enquiry. Request the supported construction and outstanding checks before the installation work is committed.
