Radar Level Stuck or Jumping? Check Distance and Echo Evidence First

Start with a symptom record

An incorrect level value does not by itself prove a failed radar or a false echo. Record the tag, model, firmware, time, process condition and the last known change. Save the existing configuration before any authorised adjustment. This is a general diagnostic preparation guide; menu names and available functions depend on the ordered device.

Collect the displayed distance, calculated level and receiving-system value at the same time. For an analogue channel, include the observed current and input status; for a digital channel, include quality and timestamp information where available. Use a safely accessible independent reference agreed by the site.

Distinguish distance from the displayed level

The Endress+Hauser FMR230 manual separates a correct distance with an incorrect calculated level from an incorrect distance. The former leads to a reference-setting check in that particular instrument, rather than immediately mapping echoes. VEGA's service guidance likewise stresses correct vessel dimensions and reference points.

Apply the distinction when collecting evidence: write down the actual reference point, empty/full definitions and unit at each stage. Do not copy another manufacturer's parameter names, limits or menu sequence into a WESIVO device.

Compare the field value and the receiving channel

If the field distance and level are credible but the PLC display is not, preserve both readings and investigate the receiving range, signal selection, quality status and last update. A held value may come from a configured fault response rather than a motionless surface. Confirm that behaviour in the applicable channel documentation.

Avoid changing several settings just to make the final display look plausible. One approved change at a time leaves evidence of what affected the result.

Use echo evidence when distance itself is suspect

Where the model provides an echo curve or diagnostic export, save it with the known surface condition and installation photograph. Mark nozzle geometry, fixed internals and any surface disturbance. A curve without a process reference is difficult to interpret.

The VEGAPULS 31 manual identifies mounting reflections and changing contamination or condensation among possible causes of incorrect echo selection. It also documents difficult liquid-surface conditions. These are troubleshooting possibilities, not proof of the cause at another site and not a promise that all radar units ignore foam or deposits.

Do not treat a suppression map as a universal repair

False-signal suppression changes how echoes are evaluated. An authorised specialist should use the exact device instructions, a verified process reference and the recorded configuration before deciding whether mapping is appropriate. Do not create a map from an unknown surface position or copy one from a different installation.

If the model cannot export a curve or map, request its supported diagnostic method rather than assuming that a third-party software tool will work. Changes to installation or cleaning also require the applicable site and device procedures.

Keep a useful closure record

Retain before/after readings, the reference used, configuration revision, diagnostic files, process condition and the receiving-channel check. Define acceptance using the project requirements and approved reference method. A single plausible value or a successful software connection does not establish accuracy throughout the range or validate a protective function.

For WESIVO RD08A selection or support, send this record with the tank drawing, medium and required signal through the related product or contact page. The original level catalogue identifies the product family; request confirmation of the selected model's tools, diagnostics and configuration. The external manuals do not certify those capabilities for WESIVO.