Ensuring reliable level measurement in tanks with internal obstructions
What happened
Process Online explains that non‑contacting radar (FMCW) level transmitters can be accurate but struggle to distinguish true surface echoes in tanks with internal obstructions. The article makes operational reality clear: obstructions such as agitators or coils can create false echoes that lead to overfill, underfill or pump damage, and physical interventions are disruptive and costly. Watch whether suppliers provide pre-install echo diagnostics and commissioning evidence rather than promising hardware-only fixes
Buyer takeaway
Treat obstructed-tank projects as commissioning-led procurements where siting and diagnostics matter as much as hardware specs
Cost / money
Directional cost risk: site-specific corrective work and mobilisation can outweigh small hardware savings, increasing near-term OPEX
Supplier / commercial
Vendors with documented obstructed-tank references gain negotiating leverage and may limit quote validity for site work
Safety / operations
False echoes can cause overfill or underfill events; require witness testing and acceptance criteria on safety‑critical tanks
What to watch
Watch for suppliers offering hardware swaps without echo diagnostics — that is rarely sufficient for obstructed tanks
Key facts
- Non-contacting FMCW radar is a preferred technology where suitable
- Internal tank structures often produce false echoes that mask the true product surface
- Physical mitigation or repositioning can be operationally disruptive and expensive
Source excerpts
Underfilled tanks reduce storage efficiency, disrupt production schedules, and can result in downstream process interruptions, product shortages or even dry running of pumps, which may cause equipment damage and unplanned downtime. Across industries that depend on just-in-time operations, such inefficiencies can translate directly into lost revenue and reduced competitiveness
Signals corresponding to known obstructions are identified and effectively ignored, while changes in the echo profile indicate movement of the actual product surface. This enables accurate, continuous level measurement, even in tanks with complex internal geometries
The most critical risk is overfilling the tank. If the transmitter reports the level as lower than it actually is, a tank may be filled beyond its capacity
