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When radar level jumps recur as the surface passes the same height, the repeatability is useful diagnostic evidence. It points to a relationship with geometry or changing echo conditions that random electrical checks may miss. Preserve the event before changing offsets, smoothing or false-echo settings.
Record the distance on both sides of the jump
Capture the local measured distance, controller value and process direction immediately before and after the event. Establish whether the jump occurs while filling, emptying or both. Record which value the instrument reports when the true surface continues moving beyond the problem region.
Plot fixed internal features from the radar reference plane: braces, a nozzle termination, heating coils or other plausible reflectors. A reported distance close to a feature is a clue, not proof that it caused the event. If supported by the installed unit and service tools, obtain the echo trace at the relevant levels.
Separate radar level jumps from conversion errors
| Observed change | Investigation to prioritise |
|---|---|
| Distance jumps too | Echo selection, changing surface conditions and the installed measurement path. |
| PLC value only | Scaling, table breakpoints, data interpretation or logic in the receiving system. |
| Same reported distance | A possible stationary reflection; compare with a dimensioned tank section. |
| Direction dependent | Surface condition, coating or echo tracking as the level crosses the region. |
The METRAVON MV-RD12 uses a 32 mm lens with a nominal 8-degree beam angle for liquid measurement. Its beam can interact with nearby tank features; a clear view through the nozzle at installation does not prove clearance throughout the measuring interval.
Use a known surface position when reviewing echo suppression
Do not perform broad false-echo learning with an unknown liquid position merely to remove the visible symptom. The real surface must be distinguished from unwanted reflections using the applicable instrument procedure. An incorrectly recorded suppression region can make another part of the operating range unreliable.
Before and after any authorised correction, repeat observations around the troublesome level and at other required operating points. Keep the earlier settings and traces. If the proposed fix is a mounting change, verify its effect on the full path rather than accepting a single stable reading.
Q1. Should a fixed offset be used to remove the step?
An offset affects the reported reference throughout the range. It does not resolve a switch between two echoes and can introduce an error where the reading was previously correct.
Q2. What if the event cannot be reproduced safely?
Use existing trends and geometry to narrow the investigation, and record the untested condition. Do not raise the tank to an unsafe level solely to obtain a diagnostic trace.
Summary
A repeatable jump deserves a height-specific investigation. Send the MV-RD12 distance trend, tank section and crossing direction so the suspected echo or conversion problem can be examined without guessing at settings.
