Silo overfill prevention — why a 3D fill level beats a single-point sensorSilo overfill prevention — why a 3D fill level beats a single-point sensorSilo overfill prevention — why a 3D fill level beats a single-point sensor

Overfilling a silo is one of those failures that is cheap to prevent and expensive to clean up: blocked vents, material out of the top, structural overpressure, downtime — and, with the wrong material, a real dust-explosion risk. The question is not whether you monitor the fill level. It is whether the measurement tells the truth.

The single-point problem. A classic level sensor — a radar, an ultrasonic, a capacitance probe or a level cable — measures the distance to the surface at one point, usually straight below the sensor. Bulk material does not cooperate with that:

• It forms cones. Filling builds a peak under the inlet; discharge pulls a funnel down the centre. The point under the sensor can be metres away from the true highest point.
• It builds up on walls. Sticky or moist material cakes on the silo wall (Anbackungen). A centre-reading sensor never sees it.
• It bridges and rat-holes. A stable bridge over an empty space reads as "full" when the silo is half-empty.

So a single-point reading is, at best, an average guess — and for overfill protection the average is the wrong number. What matters is the highest point of the surface, wherever it happens to be.

What 3D-LiDAR changes. OWL EYE® BUNKERS & FEEDERS scans the whole surface of the material, not one spot. From the 3D point cloud the system knows:

• The true highest point — so the overfill alarm fires on the actual nearest-to-full location, not a guessed centre value.
• The real filled volume — across cones, funnels and irregular surfaces.
• Surface anomalies — wall buildup, bridging and rat-holing show up as shapes that should not be there.

A real safety margin. With a true 3D surface, the overfill threshold can sit closer to the real silo capacity without risk — because the measurement is not hiding a cone peak somewhere off-centre. You get more usable capacity and a safer margin at the same time.

Contactless, no probe in the material. The sensor sits above the material and never touches it — nothing to abrade, nothing for sticky material to cake onto, no mechanical part to wear. In a dusty silo atmosphere an optional compressed-air cleaning keeps the optics clear.

One-sentence recommendation. If silo overfill is a risk you manage today with a single-point sensor, you are managing it with a guess. A 3D fill level measures the surface that actually matters.

More at /bunkers-feeders/ and in the FAQ.

Overfilling a silo is one of those failures that is cheap to prevent and expensive to clean up: blocked vents, material out of the top, structural overpressure, downtime — and, with the wrong material, a real dust-explosion risk. The question is not whether you monitor the fill level. It is whether the measurement tells the truth.

The single-point problem. A classic level sensor — a radar, an ultrasonic, a capacitance probe or a level cable — measures the distance to the surface at one point, usually straight below the sensor. Bulk material does not cooperate with that:

• It forms cones. Filling builds a peak under the inlet; discharge pulls a funnel down the centre. The point under the sensor can be metres away from the true highest point.
• It builds up on walls. Sticky or moist material cakes on the silo wall (Anbackungen). A centre-reading sensor never sees it.
• It bridges and rat-holes. A stable bridge over an empty space reads as "full" when the silo is half-empty.

So a single-point reading is, at best, an average guess — and for overfill protection the average is the wrong number. What matters is the highest point of the surface, wherever it happens to be.

What 3D-LiDAR changes. OWL EYE® BUNKERS & FEEDERS scans the whole surface of the material, not one spot. From the 3D point cloud the system knows:

• The true highest point — so the overfill alarm fires on the actual nearest-to-full location, not a guessed centre value.
• The real filled volume — across cones, funnels and irregular surfaces.
• Surface anomalies — wall buildup, bridging and rat-holing show up as shapes that should not be there.

A real safety margin. With a true 3D surface, the overfill threshold can sit closer to the real silo capacity without risk — because the measurement is not hiding a cone peak somewhere off-centre. You get more usable capacity and a safer margin at the same time.

Contactless, no probe in the material. The sensor sits above the material and never touches it — nothing to abrade, nothing for sticky material to cake onto, no mechanical part to wear. In a dusty silo atmosphere an optional compressed-air cleaning keeps the optics clear.

One-sentence recommendation. If silo overfill is a risk you manage today with a single-point sensor, you are managing it with a guess. A 3D fill level measures the surface that actually matters.

More at /bunkers-feeders/ and in the FAQ.

Overfilling a silo is one of those failures that is cheap to prevent and expensive to clean up: blocked vents, material out of the top, structural overpressure, downtime — and, with the wrong material, a real dust-explosion risk. The question is not whether you monitor the fill level. It is whether the measurement tells the truth.

The single-point problem. A classic level sensor — a radar, an ultrasonic, a capacitance probe or a level cable — measures the distance to the surface at one point, usually straight below the sensor. Bulk material does not cooperate with that:

• It forms cones. Filling builds a peak under the inlet; discharge pulls a funnel down the centre. The point under the sensor can be metres away from the true highest point.
• It builds up on walls. Sticky or moist material cakes on the silo wall (Anbackungen). A centre-reading sensor never sees it.
• It bridges and rat-holes. A stable bridge over an empty space reads as "full" when the silo is half-empty.

So a single-point reading is, at best, an average guess — and for overfill protection the average is the wrong number. What matters is the highest point of the surface, wherever it happens to be.

What 3D-LiDAR changes. OWL EYE® BUNKERS & FEEDERS scans the whole surface of the material, not one spot. From the 3D point cloud the system knows:

• The true highest point — so the overfill alarm fires on the actual nearest-to-full location, not a guessed centre value.
• The real filled volume — across cones, funnels and irregular surfaces.
• Surface anomalies — wall buildup, bridging and rat-holing show up as shapes that should not be there.

A real safety margin. With a true 3D surface, the overfill threshold can sit closer to the real silo capacity without risk — because the measurement is not hiding a cone peak somewhere off-centre. You get more usable capacity and a safer margin at the same time.

Contactless, no probe in the material. The sensor sits above the material and never touches it — nothing to abrade, nothing for sticky material to cake onto, no mechanical part to wear. In a dusty silo atmosphere an optional compressed-air cleaning keeps the optics clear.

One-sentence recommendation. If silo overfill is a risk you manage today with a single-point sensor, you are managing it with a guess. A 3D fill level measures the surface that actually matters.

More at /bunkers-feeders/ and in the FAQ.