Solids Level Measurement

Inventory levels for bulk solids are monitored using continuous solids level measurement technologies that track material volume in silos, bins, and hoppers. These measurements provide visibility into stored materials, helping operators plan production, manage supply, and reduce manual inventory checks.

Inventory levels are typically tracked using non‑contacting radar or guided wave radar for continuous measurement, combined with solids point level switches for high‑ and low‑level detection. Using both methods together helps improve inventory accuracy while supporting overfill and underfill protection.​​

Bulk solids inventory control commonly relies on four approaches:​​

• Continuous level measurement for volume tracking​​
• Point level detection for high and low limits​​
• Process alarms for abnormal conditions​​
• Operational planning using level data

Together, these methods help maintain material availability and safe storage conditions.​​

Stock levels in bulk material storage are monitored using solids level measurement technologies designed for challenging conditions such as dust, uneven surfaces, and low dielectric materials. Continuous measurement supports inventory monitoring, while point level devices help protect against overfills and empty conditions.

Yes. In many solids applications, continuous level measurement and point level measurement are combined. Continuous measurement provides inventory visibility, while point level devices add protection at critical high or low limits, supporting both operational efficiency and safety.​

Solids inventory monitoring is more challenging due to uneven material surfaces, dusty environments, and variable material properties. These factors require purpose-built solids level measurement technologies designed to deliver reliable performance in bulk solids applications.

Dust is one of the main challenges in solids level measurement, especially in applications like cement silos, grain bins, and mineral storage. Dust clouds generated during filling or emptying can weaken, scatter, or reflect signals used by some level sensors, leading to unstable or false readings.​

For reliable solids level measurement in bins and silos, the level sensor must be resistant to dust, buildup, and changing surface profiles. Modern radar-based level sensors for bulk solids silos are designed to penetrate dust clouds and maintain accurate bulk material inventory level monitoring, even in heavy powder and fine particulate applications.​

Measuring level in silos with dust clouds requires a non-contact solids level sensor that is not affected by airborne particles orbuildup on the sensor. Non-contact radar technologies are commonly used for silo level measurement for powders because theycan reliably measure distance even in dusty, abrasive, or turbulent conditions.

For continuous solids level measurement for inventory, radar-based solutions provide real-time visibility into material levels,enabling accurate bulk material inventory monitoring without mechanical contact or frequent maintenance. In addition, pairingcontinuous measurement with a solids level switch improves safety by providing high-level or overfill alarms.

Radar and point level devices serve different but complementary roles in solid level detection.

• Radar level sensors for solids provide continuous level measurement, making them ideal for bulk solids level measurement,inventory tracking, and material planning.
• Solids point level measurement devices, also known as solids level switches, are used for discrete detection at specificpoints, such as high-level or low-level limits.

In many applications, both are used together: radar for silo level monitoring and inventory, and a solids level switch for overfill protection for solids silos and safety interlocks. This combination ensures both operational efficiency and reliable high‑level detection.

False readings in solids silos are often caused by dust, buildup, angled material surfaces, internal obstructions, or moving material during filling. To avoid false readings, it’s important to select a solids level sensor resistant to buildup and designed specifically for bulk solids applications.

Reliable solids level measurement solutions use advanced signal processing and diagnostics to distinguish true level echoes from dust or structural reflections. Proper sensor placement and combining continuous measurement with a solids level switch further improves reliability for bulk solids level measurement, overfill prevention, and inventory confidence.

Solids level measurement is used across a wide range of industries where bulk materials, powders, granules, and abrasive solids are stored, processed, or handled in silos, bins, hoppers, and stockpiles. Typical industries and applications include:​

• Chemical industry – plastics pellets, specialty chemicals, pigments, silica, fertilizers, soda ash, calcium carbonate, and detergent powders stored in silos for production and finished goods inventory
• Power and energy – coal bunkers, fly ash silos, lime silos, gypsum bins, biomass, and powder activated carbon (PAC) for emissions control
• Water and wastewater treatment – lime silos, fly ash storage, sludge handling, and containers for removed solids used for pH control, stabilization, and disposal
• Mining, metals, and minerals – ore bins, stockpiles, cement, lime, coal, salt, aggregates, and abrasive materials across crushing, processing, and storage stages
• Construction materials – cement, concrete, clinker, raw meal, additives, and aggregates in large silos and pre-homogenizing halls
• Agriculture, grain, and food processing – grain storage, flour, sugar, cereals, animal feed, and powders where dust, buildup, and uneven surfaces are common​

Across these industries, silo level monitoring supports reliable inventory visibility, production continuity, and logistics planning, while solids level switches are widely used for overfill protection, empty detection, and safe operation in critical storage vessels.