Industry: transportation Application: chemical container tank Device: radar level transmitter Firmware: 20260602 Symptom: 0.05 m interference echo
The problem
Site & symptom
A radar level transmitter was installed on a chemical container tank used in transport. The customer reported that the unit could not measure an accurate level.
What the field data showed
The sensor was picking up a close-range interference echo at 0.05 m. After running the echo-learning routine the data returned to normal – but as soon as the tank was pressurised the value jumped straight back to 0.05 m. To separate an instrument fault from an installation problem the customer powered up a second unit for comparison, which confirmed the cause: a close-range interference echo generated inside the container. When the unit was not facing the ceiling, the problem did not appear.
The installation
Field case 2 – the transmitter installed on the chemical container tank.
How we fixed it
Solution
Having confirmed that the fault came from the installation rather than the instrument, we asked the customer to switch the transmitter to suspended installation and enlarge the blind zone to 0.1 m, so the unit ignores the fixed reflection in front of the antenna.
Result
After the adjustment the transmitter detected the correct waveform and produced accurate level data.
Echo spectrum: before and after
Before – the 0.05 m interference echo in the spectrum.
After – a correct waveform and an accurate tank level.
What this case teaches
A close-range echo produced by the container itself can be mistaken for the level.
The symptom can look intermittent: it may seem fixed after learning and reappear after a pressure cycle.
Comparing with a second unit is a fast way to separate an instrument fault from an installation problem.
Enlarging the blind zone to 0.1 m removed the interference echo – a small setting with a big effect.
Measuring level in a transport tank or container? Tell us the medium, the mounting position and the tank height – we will recommend the right radar level transmitter and the correct blind-zone setting.
